1
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Deng H, Yang T, Liu G, Liu L, Zhao L, Wang W, Li T, Song W, Neupert T, Liu XR, Shao J, Zhao YY, Xu N, Deng H, Huang L, Zhao Y, Zhang L, Mei JW, Wu L, He J, Liu Q, Liu C, Yin JX. Local Excitation of Kagome Spin Ice Magnetism Seen by Scanning Tunneling Microscopy. PHYSICAL REVIEW LETTERS 2024; 133:046503. [PMID: 39121416 DOI: 10.1103/physrevlett.133.046503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 06/02/2024] [Accepted: 06/28/2024] [Indexed: 08/11/2024]
Abstract
The kagome spin ice can host frustrated magnetic excitations by flipping its local spin. Under an inelastic tunneling condition, the tip in a scanning tunneling microscope can flip the local spin, and we apply this technique to kagome metal HoAgGe with a long-range ordered spin ice ground state. Away from defects, we discover a pair of pronounced dips in the local tunneling spectrum at symmetrical bias voltages with negative intensity values, serving as a striking inelastic tunneling signal. This signal disappears above the spin ice formation temperature and has a dependence on the magnetic fields, demonstrating its intimate relation with the spin ice magnetism. We provide a two-level spin-flip model to explain the tunneling dips considering the spin ice magnetism under spin-orbit coupling. Our results uncover a local emergent excitation of spin ice magnetism in a kagome metal, suggesting that local electrical field induced spin flip climbs over a barrier caused by spin-orbital locking.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Y Y Zhao
- Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong), Shenzhen, China
| | | | | | | | | | | | | | | | | | - Qihang Liu
- Department of Physics, Southern University of Science and Technology, Shenzhen, China
- Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China
- Guangdong Provincial Key Laboratory of Computational Science and Material Design, Southern University of Science and Technology, Shenzhen, China
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2
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Tang X, Wang W, Tang H, Wang M, Ye X, Hao D, Zhang J, Shan X, Lu X. Large negative differential conductance and its transformation in a single radical molecule. Chem Sci 2024; 15:10989-10996. [PMID: 39027270 PMCID: PMC11253162 DOI: 10.1039/d4sc01782j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Accepted: 06/02/2024] [Indexed: 07/20/2024] Open
Abstract
The discovery of negative differential conductance (NDC) in a single molecule and mechanism controlling this phenomenon are important for molecular electronics. We investigated the electronic properties of a typical radical molecule 3-carbamoyl-2,2,5,5-tetramethyl-3-pyrrolin-1-yloxy (CTPO) on an Au(111) surface using low-temperature scanning tunneling microscopy (STM) and inelastic electron tunneling spectroscopy. Large NDC was observed in single CTPO molecules at the boundary of the crystal monolayer. The origin of observed NDC is revealed as the inelastic electron-phonon scattering during tunneling, and the strong spatial variation of the NDC over the single molecule illustrates the nature of the localized radical group. In addition, the NDC can be transformed into a positive differential conductance peak by tuning coupling strengths between different tunneling channels. An empirical multi-channel model has been developed to describe the competition between the valley-shaped NDC and peak-shaped positive differential conductance. The unique electronic property and giant conductance change observed in this radical molecule is valuable for designing novel molecular devices in the future.
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Affiliation(s)
- Xiangqian Tang
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physical Sciences, University of Chinese Academy of Sciences Beijing 100049 China
| | - Wenyu Wang
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physical Sciences, University of Chinese Academy of Sciences Beijing 100049 China
| | - Haitao Tang
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physical Sciences, University of Chinese Academy of Sciences Beijing 100049 China
| | - Muyu Wang
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physical Sciences, University of Chinese Academy of Sciences Beijing 100049 China
| | - Xia Ye
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physical Sciences, University of Chinese Academy of Sciences Beijing 100049 China
| | - Dong Hao
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physics and Electronic Engineering, Jiangsu University Zhenjiang Jiangsu 212013 China
| | - Jinyu Zhang
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physical Sciences, University of Chinese Academy of Sciences Beijing 100049 China
| | - Xinyan Shan
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physical Sciences, University of Chinese Academy of Sciences Beijing 100049 China
- Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
| | - Xinghua Lu
- Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
- School of Physical Sciences, University of Chinese Academy of Sciences Beijing 100049 China
- Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China
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3
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Xia Y, Wang L, Ho W. Mechanisms Underlying a Quantum Superposition Microscope Based on THz-Driven Coherent Oscillations in a Two-Level Molecular Sensor. PHYSICAL REVIEW LETTERS 2024; 132:076903. [PMID: 38427859 DOI: 10.1103/physrevlett.132.076903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 12/07/2023] [Accepted: 01/04/2024] [Indexed: 03/03/2024]
Abstract
We report pump-probe measurements of a hydrogen molecule (H_{2}) in the tunnel junction of a scanning tunneling microscope coupled to ultrashort terahertz (THz) pulses. The coherent oscillation of the THz-induced dc tunneling current at a frequency of ∼0.5 THz fingerprints the absorption by H_{2} as a two-level system (TLS). Two components of the oscillatory signal are observed and point to both photon and field aspects of the THz pulses. A few loosely bound states with similar energies for the upper state of the TLS are evidenced by the coherent revival of oscillatory signal. Furthermore, the comparison of spectroscopic features of H_{2} with different tips provides an understanding of the TLS for H_{2}.
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Affiliation(s)
- Yunpeng Xia
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA
| | - Likun Wang
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA
| | - W Ho
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA
- Department of Chemistry, University of California, Irvine, California 92697-2025, USA
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4
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Xia Y, Wang L, Bai D, Ho W. Avoided Level Crossing and Entangled States of Interacting Hydrogen Molecules Detected by the Quantum Superposition Microscope. ACS NANO 2023; 17:23144-23151. [PMID: 37955976 DOI: 10.1021/acsnano.3c09109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Pump-probe measurements by ultrashort THz pulses can be used to excite and follow the coherence dynamics in the time domain of single hydrogen molecules (H2) in the junction of a scanning tunneling microscope (STM). By tailoring the resonance frequency through the sample bias, we identified two spectral signatures of the interactions among multiple H2 molecules. First, the avoided level crossing featured by energy gaps ranging from 20 to 80 GHz was observed because of the level repulsion between two H2 molecules. Second, the tip can sense the signal of H2 outside the junction through the projective measurement on the H2 inside the junction, owing to the entangled states created through the interactions. A dipolar-type interaction was integrated into the tunneling two-level system model of H2, enabling accurate reproduction of the observed behaviors. Our results obtained by the quantum superposition microscope reveal the intricate quantum mechanical interplay among H2 molecules and additionally provide a 2D platform to investigate unresolved questions of amorphous materials.
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Affiliation(s)
- Yunpeng Xia
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, United States
| | - Likun Wang
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, United States
| | - Dan Bai
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, United States
| | - Wilson Ho
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, United States
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
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5
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Wang L, Xia Y, Ho W. Atomic-scale quantum sensing based on the ultrafast coherence of an H 2 molecule in an STM cavity. Science 2022; 376:401-405. [PMID: 35446636 DOI: 10.1126/science.abn9220] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
A scanning tunneling microscope (STM) combined with a pump-probe femtosecond terahertz (THz) laser can enable coherence measurements of single molecules. We report THz pump-probe measurements that demonstrate quantum sensing based on a hydrogen (H2) molecule in the cavity created with an STM tip near a surface. Atomic-scale spatial and femtosecond temporal resolutions were obtained from this quantum coherence. The H2 acts as a two-level system, with its coherent superposition exhibiting extreme sensitivity to the applied electric field and the underlying atomic composition of the copper nitride (Cu2N) monolayer islands grown on a Cu(100) surface. We acquired time-resolved images of THz rectification of H2 over Cu2N islands for variable pump-probe delay times to visualize the heterogeneity of the chemical environment at sub-angstrom scale.
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Affiliation(s)
- Likun Wang
- Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
| | - Yunpeng Xia
- Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
| | - W Ho
- Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.,Department of Chemistry, University of California, Irvine, CA 92697, USA
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6
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Jung J, Nam S, Wolf C, Heinrich AJ, Chae J. Atomic-scale intermolecular interaction of hydrogen with a single VOPc molecule on the Au(111) surface. RSC Adv 2021; 11:6240-6245. [PMID: 35423168 PMCID: PMC8694828 DOI: 10.1039/d0ra08951f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 01/26/2021] [Indexed: 12/02/2022] Open
Abstract
Molecular dynamics of hydrogen molecules (H2) on surfaces and their interactions with other molecules have been studied with the goal of improvement of hydrogen storage devices for energy applications. Recently, the dynamic behavior of a H2 at low temperature has been utilized in scanning tunnelling microscopy (STM) for sub-atomic resolution imaging within a single molecule. In this work, we have investigated the intermolecular interaction between H2 and individual vanadyl phthalocyanine (VOPc) molecules on Au(111) substrates by using STM and non-contact atomic force microscopy (NC-AFM). We measured tunnelling spectra and random telegraphic noise (RTN) on VOPc molecules to reveal the origin of the dynamic behavior of the H2. The tunnelling spectra show switching between two states with different tunnelling conductance as a function of sample bias voltage and RTN is measured near transition voltage between the two states. The spatial variation of the RTN indicates that the two-state fluctuation is dependent on the atomic-scale interaction of H2 with the VOPc molecule. Density functional theory calculations show that a H2 molecule can be trapped by a combination of a tip-induced electrostatic potential well and the potential formed by a VOPc underneath. We suggest the origin of the two-state noise as transition of H2 between minima in these potentials with barrier height of 20-30 meV. In addition, the bias dependent AFM images verify that H2 can be trapped and released at the tip-sample junction.
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Affiliation(s)
- Jinoh Jung
- Department of Physics, KAIST Daejeon 34141 Korea
- Center for Quantum Nanoscience, Institute for Basic Science (IBS) Seoul 03760 Korea
| | - Shinjae Nam
- Center for Quantum Nanoscience, Institute for Basic Science (IBS) Seoul 03760 Korea
- Physics Department, Ewha Womans University Seoul 03760 Korea
| | - Christoph Wolf
- Center for Quantum Nanoscience, Institute for Basic Science (IBS) Seoul 03760 Korea
- Ewha Womans University Seoul 03760 Korea
| | - Andreas J Heinrich
- Center for Quantum Nanoscience, Institute for Basic Science (IBS) Seoul 03760 Korea
- Physics Department, Ewha Womans University Seoul 03760 Korea
| | - Jungseok Chae
- Center for Quantum Nanoscience, Institute for Basic Science (IBS) Seoul 03760 Korea
- Ewha Womans University Seoul 03760 Korea
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7
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Kim Y. Photoswitching Molecular Junctions: Platforms and Electrical Properties. Chemphyschem 2020; 21:2368-2383. [PMID: 32777151 DOI: 10.1002/cphc.202000564] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 08/07/2020] [Indexed: 11/10/2022]
Abstract
Remarkable advances in technology have enabled the manipulation of individual molecules and the creation of molecular electronic devices utilizing single and ensemble molecules. Maturing the field of molecular electronics has led to the development of functional molecular devices, especially photoswitching or photochromic molecular junctions, which switch electronic properties under external light irradiation. This review introduces and summarizes the platforms for investigating the charge transport in single and ensemble photoswitching molecular junctions as well as the electronic properties of diverse photoswitching molecules such as diarylethene, azobenzene, dihydropyrene, and spiropyran. Furthermore, the article discusses the remaining challenges and the direction for moving forward in this area for future photoswitching molecular devices.
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Affiliation(s)
- Youngsang Kim
- Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA.,Current address, 7644 Ambrose way, California, 95831, USA
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8
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Tewari S, Sabater C, van Ruitenbeek J. Identification of vibration modes in single-molecule junctions by strong inelastic signals in noise. NANOSCALE 2019; 11:19462-19467. [PMID: 31528938 DOI: 10.1039/c9nr05774a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Conductance measurements in single-molecule junctions (SMJs) are on many occasions accompanied by inelastic spectroscopy and shot-noise measurements in order to obtain information about different vibration modes (or vibrons) and channels involved in the transport respectively. We have extended the single-molecule shot-noise measurements, which were previously performed at low bias, to high bias and we have studied the effects of these vibrons on the noise for a Deuterium (D2) molecule between Pt leads. We report here two important findings from these measurements. First, we find in our noise measurements that at the vibron energies of the molecule, a two-level fluctuation (TLF) is excited in the junction. Second, we show that in the presence of this TLF, a form of enhanced noise spectroscopy can be performed to detect inelastic electron-vibron interactions, by studying the third derivative of the noise (d3SI/dV3). This is possible because TLFs are insensitive to elastic scattering of electrons from defects, which nevertheless leave their signature in the usual inelastic electron tunnelling spectroscopy (IETS) measurements.
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Affiliation(s)
- Sumit Tewari
- Huygens-Kamerlingh Onnes Laboratory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands.
| | - Carlos Sabater
- Huygens-Kamerlingh Onnes Laboratory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands.
| | - Jan van Ruitenbeek
- Huygens-Kamerlingh Onnes Laboratory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands.
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9
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Kiguchi M, Fujii S. Governing the Metal–Molecule Interface: Towards New Functionality in Single-Molecule Junctions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20160229] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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10
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Wang H, Thoss M. On the accuracy of the noninteracting electron approximation for vibrationally coupled electron transport. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Engelund M, Godlewski S, Kolmer M, Zuzak R, Such B, Frederiksen T, Szymonski M, Sánchez-Portal D. The butterfly - a well-defined constant-current topography pattern on Si(001):H and Ge(001):H resulting from current-induced defect fluctuations. Phys Chem Chem Phys 2016; 18:19309-17. [PMID: 27375264 DOI: 10.1039/c6cp04031d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Dangling bond (DB) arrays on Si(001):H and Ge(001):H surfaces can be patterned with atomic precision and they exhibit complex and rich physics making them interesting from both technological and fundamental perspectives. But their complex behavior often makes scanning tunneling microscopy (STM) images difficult to interpret and simulate. Recently it was shown that low-temperature imaging of unoccupied states of an unpassivated dimer on Ge(001):H results in a symmetric butterfly-like STM pattern, despite the fact that the equilibrium dimer configuration is expected to be a bistable, buckled geometry. Here, based on a thorough characterization of the low-bias switching events on Ge(001):H, we propose a new imaging model featuring a dynamical two-state rate equation. On both Si(001):H and Ge(001):H, this model allows us to reproduce the features of the observed symmetric empty-state images which strongly corroborates the idea that the patterns arise due to fast switching events and provides an insight into the relationship between the tunneling current and switching rates. We envision that our new imaging model can be applied to simulate other bistable systems where fluctuations arise from transiently charged electronic states.
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Affiliation(s)
- Mads Engelund
- Centro de Física de Materiales (CFM), CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, 20018, Donostia-San Sebastián, Spain.
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12
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Frisenda R, Perrin ML, van der Zant HSJ. Probing the local environment of a single OPE3 molecule using inelastic tunneling electron spectroscopy. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2015; 6:2477-2484. [PMID: 26885460 PMCID: PMC4734430 DOI: 10.3762/bjnano.6.257] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 12/09/2015] [Indexed: 06/05/2023]
Abstract
We study single-molecule oligo(phenylene ethynylene)dithiol junctions by means of inelastic electron tunneling spectroscopy (IETS). The molecule is contacted with gold nano-electrodes formed with the mechanically controllable break junction technique. We record the IETS spectrum of the molecule from direct current measurements, both as a function of time and electrode separation. We find that for fixed electrode separation the molecule switches between various configurations, which are characterized by different IETS spectra. Similar variations in the IETS signal are observed during atomic rearrangements upon stretching of the molecular junction. Using quantum chemistry calculations, we identity some of the vibrational modes which constitute a chemical fingerprint of the molecule. In addition, changes can be attributed to rearrangements of the local molecular environment, in particular at the molecule-electrode interface. This study shows the importance of taking into account the interaction with the electrodes when describing inelastic contributions to transport through single-molecule junctions.
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Affiliation(s)
- Riccardo Frisenda
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands
| | - Mickael L Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands
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13
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Frisenda R, Gaudenzi R, Franco C, Mas-Torrent M, Rovira C, Veciana J, Alcon I, Bromley ST, Burzurí E, van der Zant HSJ. Kondo effect in a neutral and stable all organic radical single molecule break junction. NANO LETTERS 2015; 15:3109-3114. [PMID: 25897770 DOI: 10.1021/acs.nanolett.5b00155] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Organic radicals are neutral, purely organic molecules exhibiting an intrinsic magnetic moment due to the presence of an unpaired electron in the molecule in its ground state. This property, added to the low spin-orbit coupling and weak hyperfine interactions, make neutral organic radicals good candidates for molecular spintronics insofar as the radical character is stable in solid state electronic devices. Here we show that the paramagnetism of the polychlorotriphenylmethyl radical molecule in the form of a Kondo anomaly is preserved in two- and three-terminal solid-state devices, regardless of mechanical and electrostatic changes. Indeed, our results demonstrate that the Kondo anomaly is robust under electrodes displacement and changes of the electrostatic environment, pointing to a localized orbital in the radical as the source of magnetism. Strong support to this picture is provided by density functional calculations and measurements of the corresponding nonradical species. These results pave the way toward the use of all-organic neutral radical molecules in spintronics devices and open the door to further investigations into Kondo physics.
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Affiliation(s)
- Riccardo Frisenda
- †Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
| | - Rocco Gaudenzi
- †Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
| | - Carlos Franco
- ‡Institut de Ciéncia de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus de la UAB, 08193, Bellaterra, Spain
| | - Marta Mas-Torrent
- ‡Institut de Ciéncia de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus de la UAB, 08193, Bellaterra, Spain
| | - Concepció Rovira
- ‡Institut de Ciéncia de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus de la UAB, 08193, Bellaterra, Spain
| | - Jaume Veciana
- ‡Institut de Ciéncia de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus de la UAB, 08193, Bellaterra, Spain
| | - Isaac Alcon
- §Departament de Química Física and Institut de Química Teórica i Computacional (IQTCUB), Universitat de Barcelona, E-08028 Barcelona, Spain
| | - Stefan T Bromley
- §Departament de Química Física and Institut de Química Teórica i Computacional (IQTCUB), Universitat de Barcelona, E-08028 Barcelona, Spain
- ∥Institició Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
| | - Enrique Burzurí
- †Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
| | - Herre S J van der Zant
- †Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands
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14
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Rakhmilevitch D, Korytár R, Bagrets A, Evers F, Tal O. Electron-vibration interaction in the presence of a switchable Kondo resonance realized in a molecular junction. PHYSICAL REVIEW LETTERS 2014; 113:236603. [PMID: 25526145 DOI: 10.1103/physrevlett.113.236603] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2014] [Indexed: 06/04/2023]
Abstract
The interaction of individual electrons with vibrations has been extensively studied. However, the nature of electron-vibration interaction in the presence of many-body electron correlations such as a Kondo state has not been fully investigated. Here, we present transport measurements on a Copper-phthalocyanine molecule, suspended between two silver electrodes in a break-junction setup. Our measurements reveal both zero bias and satellite conductance peaks, which are identified as Kondo resonances with a similar Kondo temperature. The relation of the satellite peaks to electron-vibration interaction is corroborated using several independent spectroscopic indications, as well as ab initio calculations. Further analysis reveals that the contribution of vibration-induced inelastic current is significant in the presence of a Kondo resonance.
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Affiliation(s)
- D Rakhmilevitch
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 761001, Israel
| | - R Korytár
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe 76128, Germany
| | - A Bagrets
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe 76128, Germany and Steinbuch Centre for Computing, Karlsruhe Institute of Technology, Karlsruhe 76128, Germany
| | - F Evers
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe 76128, Germany and Institut Für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, Karlsruhe 76128, Germany
| | - O Tal
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot 761001, Israel
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15
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Natterer FD, Patthey F, Brune H. Resonant-enhanced spectroscopy of molecular rotations with a scanning tunneling microscope. ACS NANO 2014; 8:7099-7105. [PMID: 24998795 DOI: 10.1021/nn501999k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We use rotational excitation spectroscopy with a scanning tunneling microscope to investigate the rotational properties of molecular hydrogen and its isotopes physisorbed on the surfaces of graphene and hexagonal boron nitride (h-BN), grown on Ni(111), Ru(0001), and Rh(111). The rotational excitation energies are in good agreement with ΔJ = 2 transitions of freely spinning p-H2 and o-D2 molecules. The variations of the spectral line shapes for H2 among the different surfaces can be traced back to a molecular resonance-mediated tunneling mechanism. Our data for H2/h-BN/Rh(111) suggest a local intrinsic gating on this surface due to lateral static dipoles. Spectra on a mixed monolayer of H2, HD, and D2 display all three J = 0 → 2 rotational transitions, irrespective of tip position, thus pointing to a multimolecule excitation, or molecular mobility in the physisorbed close-packed layer.
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16
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Shiotari A, Hatta S, Okuyama H, Aruga T. Role of hydrogen bonding in the catalytic reduction of nitric oxide. Chem Sci 2014. [DOI: 10.1039/c3sc52334a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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17
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Li S, Yu A, Toledo F, Han Z, Wang H, He HY, Wu R, Ho W. Rotational and vibrational excitations of a hydrogen molecule trapped within a nanocavity of tunable dimension. PHYSICAL REVIEW LETTERS 2013; 111:146102. [PMID: 24138258 DOI: 10.1103/physrevlett.111.146102] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Indexed: 05/13/2023]
Abstract
The rotational and vibrational transitions of a hydrogen molecule weakly adsorbed on the Au(110) surface at 10 K were detected by inelastic electron tunneling spectroscopy with a scanning tunneling microscope. The energies of the j=0 to j=2 rotational transition for para-H(2) and HD indicate that the molecule behaves as a three-dimensional rigid rotor trapped within the tunnel junction. An increase in the bond length of H(2) was precisely measured from the downshift in the rotational energy as the tip-substrate distance decreases.
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Affiliation(s)
- Shaowei Li
- Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA
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18
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Lotze C, Corso M, Franke KJ, von Oppen F, Pascual JI. Driving a Macroscopic Oscillator with the Stochastic Motion of a Hydrogen Molecule. Science 2012; 338:779-82. [DOI: 10.1126/science.1227621] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Christian Lotze
- Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
| | - Martina Corso
- Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
| | | | - Felix von Oppen
- Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
- Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, 14195 Berlin, Germany
| | - Jose Ignacio Pascual
- Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany
- CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain
- IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
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19
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Wang H, Pshenichnyuk I, Härtle R, Thoss M. Numerically exact, time-dependent treatment of vibrationally coupled electron transport in single-molecule junctions. J Chem Phys 2011; 135:244506. [DOI: 10.1063/1.3660206] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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20
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Weiss C, Wagner C, Kleimann C, Rohlfing M, Tautz FS, Temirov R. Imaging Pauli repulsion in scanning tunneling microscopy. PHYSICAL REVIEW LETTERS 2010; 105:086103. [PMID: 20868116 DOI: 10.1103/physrevlett.105.086103] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Revised: 02/12/2010] [Indexed: 05/12/2023]
Abstract
A scanning tunneling microscope (STM) has been equipped with a nanoscale force sensor and signal transducer composed of a single D2 molecule that is confined in the STM junction. The uncalibrated sensor is used to obtain ultrahigh geometric image resolution of a complex organic molecule adsorbed on a noble metal surface. By means of conductance-distance spectroscopy and corresponding density functional calculations the mechanism of the sensor and transducer is identified. It probes the short-range Pauli repulsion and converts this signal into variations of the junction conductance.
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Affiliation(s)
- C Weiss
- Institut für Bio- und Nanosysteme 3, Forschungszentrum Jülich, 52425 Jülich, Germany
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21
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Scott GD, Palacios JJ, Natelson D. Anomalous transport and possible phase transition in palladium nanojunctions. ACS NANO 2010; 4:2831-2837. [PMID: 20405906 DOI: 10.1021/nn1000172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Many phenomena in condensed matter are thought to result from competition between different ordered phases. Palladium is a paramagnetic metal close to both ferromagnetism and superconductivity and is, therefore, a potentially interesting material to consider. Nanoscale structuring of matter can modify relevant physical energy scales, leading to effects such as locally modified magnetic interactions. We present transport measurements in electromigrated palladium break junction devices showing the emergence at low temperatures of anomalous sharp features in the differential conductance. These features appear symmetrically in applied bias and exhibit a temperature dependence of their characteristic voltages reminiscent of a mean-field phase transition. The systematic variation of these voltages with zero bias conductance, together with density functional theory calculations illustrating the relationship between the magnetization of Pd and atomic coordination, suggests that the features may result from the onset of spontaneous magnetization in the nanojunction electrodes. We propose that the characteristic conductance features are related to inelastic tunneling involving magnetic excitations.
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Affiliation(s)
- Gavin D Scott
- Department of Physics and Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005, USA.
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22
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Jan van der Molen S, Liljeroth P. Charge transport through molecular switches. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:133001. [PMID: 21389503 DOI: 10.1088/0953-8984/22/13/133001] [Citation(s) in RCA: 134] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We review the fascinating research on charge transport through switchable molecules. In the past decade, detailed investigations have been performed on a great variety of molecular switches, including mechanically interlocked switches (rotaxanes and catenanes), redox-active molecules and photochromic switches (e.g. azobenzenes and diarylethenes). To probe these molecules, both individually and in self-assembled monolayers (SAMs), a broad set of methods have been developed. These range from low temperature scanning tunneling microscopy (STM) via two-terminal break junctions to larger scale SAM-based devices. It is generally found that the electronic coupling between molecules and electrodes has a profound influence on the properties of such molecular junctions. For example, an intrinsically switchable molecule may lose its functionality after it is contacted. Vice versa, switchable two-terminal devices may be created using passive molecules ('extrinsic switching'). Developing a detailed understanding of the relation between coupling and switchability will be of key importance for both future research and technology.
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23
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Taniguchi M, Tsutsui M, Yokota K, Kawai T. Inelastic electron tunneling spectroscopy of single-molecule junctions using a mechanically controllable break junction. NANOTECHNOLOGY 2009; 20:434008. [PMID: 19801761 DOI: 10.1088/0957-4484/20/43/434008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report the use of electrical measurements to identify simultaneously the number and type of organic molecules within metal-molecule-metal junctions. Our strategy combines analyses of single-molecule conductance and inelastic electron tunneling spectra, exploiting a nanofabricated mechanically controllable break junction. We found that the peak linewidth of the inelastic electron tunneling spectrum decreased as the modulation voltage and temperature decreased, and that the selection rule for inelastic electron tunneling spectroscopy agrees with that for Raman spectroscopy. Furthermore, the differential conductance curve of the single-molecule junction suggests that it has asymmetrical electrode-molecule coupling.
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Affiliation(s)
- Masateru Taniguchi
- The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka, Japan.
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24
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Härtle R, Benesch C, Thoss M. Vibrational nonequilibrium effects in the conductance of single molecules with multiple electronic states. PHYSICAL REVIEW LETTERS 2009; 102:146801. [PMID: 19392465 DOI: 10.1103/physrevlett.102.146801] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2008] [Indexed: 05/15/2023]
Abstract
Vibrational nonequilibrium effects in charge transport through single-molecule junctions are investigated. Focusing on molecular bridges with multiple electronic states, it is shown that electronic-vibrational coupling triggers a variety of vibronic emission and absorption processes, which influence the conductance properties and mechanical stability of single-molecule junctions profoundly. Employing a master equation and a nonequilibrium Green's function approach, these processes are analyzed in detail for a generic model of a molecular junction and for benzenedibutanethiolate bound to gold electrodes.
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Affiliation(s)
- R Härtle
- Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
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25
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Zazunov A, Schulz A, Egger R. Josephson-current-induced conformational switching of a molecular quantum dot. PHYSICAL REVIEW LETTERS 2009; 102:047002. [PMID: 19257464 DOI: 10.1103/physrevlett.102.047002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2008] [Indexed: 05/27/2023]
Abstract
We discuss the behavior of a two-level system coupled to a quantum dot contacted by superconducting source and drain electrodes, representing a simple model for the conformational degree of freedom of a molecular dot or a break junction. The Josephson current is shown to induce conformational changes, including a complete reversal. For small bias voltage, periodic conformational motions induced by Landau-Zener transitions between Andreev states are predicted.
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Affiliation(s)
- A Zazunov
- Institut für Theoretische Physik, Heinrich-Heine-Universität, D-40225 Düsseldorf, Germany
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26
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Hod O, Baer R, Rabani E. Magnetoresistance of nanoscale molecular devices based on Aharonov-Bohm interferometry. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:383201. [PMID: 21693808 DOI: 10.1088/0953-8984/20/38/383201] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Control of conductance in molecular junctions is of key importance in the growing field of molecular electronics. The current in these junctions is often controlled by an electric gate designed to shift conductance peaks into the low bias regime. Magnetic fields, on the other hand, have rarely been used due to the small magnetic flux captured by molecular conductors (an exception is the Kondo effect in single-molecule transistors). This is in contrast to a related field, electronic transport through mesoscopic devices, where considerable activity with magnetic fields has led to a rich description of transport. The scarcity of experimental activity is due to the belief that significant magnetic response is obtained only when the magnetic flux is of the order of the quantum flux, while attaining such a flux for molecular and nanoscale devices requires unrealistic magnetic fields. Here we review recent theoretical work regarding the essential physical requirements necessary for the construction of nanometer-scale magnetoresistance devices based on an Aharonov-Bohm molecular interferometer. We show that control of the conductance properties using small fractions of a magnetic flux can be achieved by carefully adjusting the lifetime of the conducting electrons through a pre-selected single state that is well separated from other states due to quantum confinement effects. Using a simple analytical model and more elaborate atomistic calculations we demonstrate that magnetic fields which give rise to a magnetic flux comparable to 10(-3) of the quantum flux can be used to switch a class of different molecular and nanometer rings, ranging from quantum corrals, carbon nanotubes and even a molecular ring composed of polyconjugated aromatic materials. The unique characteristics of the magnetic field as a gate is further discussed and demonstrated in two different directions. First, a three-terminal molecular router devices that can function as a parallel logic gate, processing two logic operations simultaneously, is presented. Second, the role of inelastic effects arising from electron-phonon couplings on the magnetoresistance properties is analyzed. We show that a remarkable difference between electric and magnetic gating is also revealed when inelastic effects become significant. The inelastic broadening of response curves to electric gates is replaced by a narrowing of magnetoconductance peaks, thereby enhancing the sensitivity of the device.
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Affiliation(s)
- Oded Hod
- Department of Chemistry, Rice University, Houston, TX 77005-1892, USA
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27
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Ohara M, Kim Y, Yanagisawa S, Morikawa Y, Kawai M. Role of molecular orbitals near the fermi level in the excitation of vibrational modes of a single molecule at a scanning tunneling microscope junction. PHYSICAL REVIEW LETTERS 2008; 100:136104. [PMID: 18517972 DOI: 10.1103/physrevlett.100.136104] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2007] [Indexed: 05/26/2023]
Abstract
Inelastically tunneled electrons from the tip of a scanning tunneling microscope were used to induce S-S bond dissociation of a (CH(3)S)(2) and lateral hopping of a CH(3)S on Cu(111) at 4.7 K. Both experimental results and theoretical calculations confirm that the excitation mechanism of the vibrationally induced chemistry reflects the projected density of states of molecular orbitals that appear near the Fermi level as a result of the rehybridization of the orbitals between the adsorbed molecules and the substrate metal atoms.
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Affiliation(s)
- Michiaki Ohara
- Surface Chemistry Laboratory, RIKEN, Saitama 351-0198, Japan
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28
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Moix JM, Hernandez R, Pollak E. Momentum and Velocity Autocorrelation Functions of a Diatomic Molecule Are Not Necessarily Proportional to Each Other. J Phys Chem B 2007; 112:213-8. [PMID: 17824637 DOI: 10.1021/jp0730951] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We present a computation of the classical momentum and velocity correlation functions of Br2 considered as an idealized molecular wire connecting dissipated lead atoms at each end of the dimer. It is demonstrated that coupling of the diatomic relative momentum to the leads may result in momenta that are not equal to the mass-weighted velocity. These differences show up in numerical simulations of both the average value and time correlations of the bond momentum and velocity. These observations are supported by analytical predictions for the average temperature of the diatomic. They imply that the "standard recipes" for modeling the system with a generalized Langevin equation are insufficient.
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Affiliation(s)
- Jeremy M Moix
- Center for Computational Molecular Sciences & Technology, School of Chemistry & Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA
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29
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Kiguchi M, Stadler R, Kristensen IS, Djukic D, van Ruitenbeek JM. Evidence for a single hydrogen molecule connected by an atomic chain. PHYSICAL REVIEW LETTERS 2007; 98:146802. [PMID: 17501300 DOI: 10.1103/physrevlett.98.146802] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2006] [Indexed: 05/15/2023]
Abstract
Stable, single-molecule conducting-bridge configurations are typically identified from peak structures in a conductance histogram. In previous work on Pt with H2 at cryogenic temperatures it has been shown that a peak near 1G0 identifies a single-molecule Pt-H2-Pt bridge. The histogram shows an additional structure with lower conductance that has not been identified. Here, we show that it is likely due to a hydrogen decorated Pt chain in contact with the H2 molecular bridge.
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Affiliation(s)
- M Kiguchi
- Kamerlingh Onnes Laboratorium, Universiteit Leiden, P.O. Box 9504, NL-2300 RA Leiden, The Netherlands
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