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Roura-Bas P, Güller F, Tosi L, Aligia AA. Destructive quantum interference in transport through molecules with electron-electron and electron-vibration interactions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:465602. [PMID: 31357183 DOI: 10.1088/1361-648x/ab3684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We study the transport through a molecular junction exhibiting interference effects. We show that these effects can still be observed in the presence of molecular vibrations if Coulomb repulsion is taken into account. In the Kondo regime, the conductance of the junction can be changed by several orders of magnitude by tuning the levels of the molecule, or displacing a contact between two atoms, from nearly perfect destructive interference to values of the order of 2e 2/h expected in Kondo systems. We also show that this large conductance change is robust for reasonable temperatures and voltages for symmetric and asymmetric tunnel couplings between the source-drain electrodes and the molecular orbitals. This is relevant for the development of quantum interference effect transistors based on molecular junctions.
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Affiliation(s)
- P Roura-Bas
- Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, CONICET, 8400 Bariloche, Argentina
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2
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Current Correlations in a Quantum Dot Ring: A Role of Quantum Interference. ENTROPY 2019; 21:e21050527. [PMID: 33267241 PMCID: PMC7515016 DOI: 10.3390/e21050527] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 05/17/2019] [Accepted: 05/22/2019] [Indexed: 12/19/2022]
Abstract
We present studies of the electron transport and circular currents induced by the bias voltage and the magnetic flux threading a ring of three quantum dots coupled with two electrodes. Quantum interference of electron waves passing through the states with opposite chirality plays a relevant role in transport, where one can observe Fano resonance with destructive interference. The quantum interference effect is quantitatively described by local bond currents and their correlation functions. Fluctuations of the transport current are characterized by the Lesovik formula for the shot noise, which is a composition of the bond current correlation functions. In the presence of circular currents, the cross-correlation of the bond currents can be very large, but it is negative and compensates for the large positive auto-correlation functions.
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Donarini A, Niklas M, Schafberger M, Paradiso N, Strunk C, Grifoni M. Coherent population trapping by dark state formation in a carbon nanotube quantum dot. Nat Commun 2019; 10:381. [PMID: 30670686 PMCID: PMC6343009 DOI: 10.1038/s41467-018-08112-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 11/28/2018] [Indexed: 11/10/2022] Open
Abstract
Illumination of atoms by resonant lasers can pump electrons into a coherent superposition of hyperfine levels which can no longer absorb the light. Such superposition is known as a dark state, because fluorescent light emission is then suppressed. Here we report an all-electric analogue of this destructive interference effect in a carbon nanotube quantum dot. The dark states are a coherent superposition of valley (angular momentum) states which are decoupled from either the drain or the source leads. Their emergence is visible in asymmetric current−voltage characteristics, with missing current steps and current suppression which depend on the polarity of the applied source-drain bias. Our results demonstrate coherent-population trapping by all-electric means in an artificial atom. Transport in quantum systems is complex and can be suppressed by coherent superposition of the involved states. Here, the authors find all-electronic suppression of transport in a carbon nanotube originating from coherent population trapping and give criteria for the presence of such a dark state.
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Affiliation(s)
- Andrea Donarini
- Institute for Theoretical Physics, University of Regensburg, 93040, Regensburg, Germany
| | - Michael Niklas
- Institute for Theoretical Physics, University of Regensburg, 93040, Regensburg, Germany
| | - Michael Schafberger
- Institute for Experimental and Applied Physics, University of Regensburg, 93040, Regensburg, Germany
| | - Nicola Paradiso
- Institute for Experimental and Applied Physics, University of Regensburg, 93040, Regensburg, Germany
| | - Christoph Strunk
- Institute for Experimental and Applied Physics, University of Regensburg, 93040, Regensburg, Germany.
| | - Milena Grifoni
- Institute for Theoretical Physics, University of Regensburg, 93040, Regensburg, Germany.
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Yu P, Kocić N, Repp J, Siegert B, Donarini A. Apparent Reversal of Molecular Orbitals Reveals Entanglement. PHYSICAL REVIEW LETTERS 2017; 119:056801. [PMID: 28949707 DOI: 10.1103/physrevlett.119.056801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Indexed: 05/28/2023]
Abstract
The frontier orbital sequence of individual dicyanovinyl-substituted oligothiophene molecules is studied by means of scanning tunneling microscopy. On NaCl/Cu(111), the molecules are neutral, and the two lowest unoccupied molecular states are observed in the expected order of increasing energy. On NaCl/Cu(311), where the molecules are negatively charged, the sequence of two observed molecular orbitals is reversed, such that the one with one more nodal plane appears lower in energy. These experimental results, in open contradiction with a single-particle interpretation, are explained by a many-body theory predicting a strongly entangled doubly charged ground state.
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Affiliation(s)
- Ping Yu
- Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany and School of Physical Science and Technology, ShanghaiTech University, 201210 Shanghai, China
| | - Nemanja Kocić
- Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany
| | - Jascha Repp
- Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany
| | - Benjamin Siegert
- Institute of Theoretical Physics, University of Regensburg, 93053 Regensburg, Germany
| | - Andrea Donarini
- Institute of Theoretical Physics, University of Regensburg, 93053 Regensburg, Germany
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Gaudenzi R, Misiorny M, Burzurí E, Wegewijs MR, van der Zant HSJ. Transport mirages in single-molecule devices. J Chem Phys 2017. [DOI: 10.1063/1.4975767] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- R. Gaudenzi
- Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands
| | - M. Misiorny
- Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, 412 96 Göteborg, Sweden
- Faculty of Physics, Adam Mickiewicz University, 61-614 Poznań, Poland
| | - E. Burzurí
- Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands
| | - M. R. Wegewijs
- Peter Grünberg Institut, Forschungszentrum Jülich, 52425 Jülich, Germany
- JARA-FIT, 52056 Aachen, Germany
- Institute for Theory of Statistical Physics, RWTH Aachen, 52056 Aachen, Germany
| | - H. S. J. van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands
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Nozaki D, Lücke A, Schmidt WG. Molecular Orbital Rule for Quantum Interference in Weakly Coupled Dimers: Low-Energy Giant Conductivity Switching Induced by Orbital Level Crossing. J Phys Chem Lett 2017; 8:727-732. [PMID: 28106402 DOI: 10.1021/acs.jpclett.6b02989] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Destructive quantum interference (QI) in molecular junctions has attracted much attention in recent years. It can tune the conductance of molecular devices dramatically, which implies numerous potential applications in thermoelectric and switching applications. There are several schemes that address and rationalize QI in single molecular devices. Dimers play a particular role in this respect because the QI signal may disappear, depending on the dislocation of monomers. We derive a simple rule that governs the occurrence of QI in weakly coupled dimer stacks of both alternant and nonalternant polyaromatic hydrocarbons (PAHs) and extends the Tada-Yoshizawa scheme. Starting from the Green's function formalism combined with the molecular orbital expansion approach, it is shown that QI-induced antiresonances and their energies can be predicted from the amplitudes of the respective monomer terminal molecular orbitals. The condition is illustrated for a toy model consisting of two hydrogen molecules and applied within density functional calculations to alternant dimers of oligo(phenylene-ethynylene) and nonalternant PAHs. Minimal dimer structure modifications that require only a few millielectronvolts and lead to an energy crossing of the essentially preserved monomer orbitals are shown to result in giant conductance switching ratios.
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Affiliation(s)
- Daijiro Nozaki
- Lehrstuhl für Theoretische Materialphysik, Universität Paderborn , 33095 Paderborn, Germany
| | - Andreas Lücke
- Lehrstuhl für Theoretische Materialphysik, Universität Paderborn , 33095 Paderborn, Germany
| | - Wolf Gero Schmidt
- Lehrstuhl für Theoretische Materialphysik, Universität Paderborn , 33095 Paderborn, Germany
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Tian H, Wang S, Hu J, Wang J. The chirality dependent spin filter design in the graphene-like junction. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:125005. [PMID: 25694439 DOI: 10.1088/0953-8984/27/12/125005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We investigate the chirality-dependent spin transport in a graphene-like topological insulator (TI) TI/n junction, where a perpendicular magnetic field or an off-resonant circularly- polarized light field is applied to the normal (n) region. It is found that the coupling between the helical edge states of the TI and chiral edge states from the magnetic/light field results in a perfect spin filtering effect and only one spin species can tunnel through the junction interface. The origin is ascribed to the chirality-conservation requirement, since the two spin species have the opposite chiralities in the TI region and in the n region both of them have the same chiralities. For a TI/n superlattice structure, the spin filtering effect is enhanced and even survives in a fairly strong disorder environment.
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Affiliation(s)
- Hongyu Tian
- Department of Physics, Yancheng Institute of Technology, Jiangsu 224051, People's Republic of China
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Saraiva-Souza A, Smeu M, Zhang L, Souza Filho AG, Guo H, Ratner MA. Molecular Spintronics: Destructive Quantum Interference Controlled by a Gate. J Am Chem Soc 2014; 136:15065-71. [DOI: 10.1021/ja508537n] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Aldilene Saraiva-Souza
- Centre
for the Physics of Materials and Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada
| | - Manuel Smeu
- Departamento
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Lei Zhang
- Centre
for the Physics of Materials and Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada
| | | | - Hong Guo
- Centre
for the Physics of Materials and Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada
| | - Mark A. Ratner
- Departamento
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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Shang NG, Papakonstantinou P, Sharma S, Lubarsky G, Li M, McNeill DW, Quinn AJ, Zhou W, Blackley R. Controllable selective exfoliation of high-quality graphene nanosheets and nanodots by ionic liquid assisted grinding. Chem Commun (Camb) 2012; 48:1877-9. [DOI: 10.1039/c2cc17185f] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Stadler R, Markussen T. Controlling the transmission line shape of molecular t-stubs and potential thermoelectric applications. J Chem Phys 2011; 135:154109. [DOI: 10.1063/1.3653790] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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Baumgärtel MME, Hell M, Das S, Wegewijs MR. Transport and accumulation of spin anisotropy. PHYSICAL REVIEW LETTERS 2011; 107:087202. [PMID: 21929200 DOI: 10.1103/physrevlett.107.087202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Indexed: 05/31/2023]
Abstract
We show that spin anisotropy can be transferred to an isotropic system by transport of a spin-quadrupole moment. We derive the quadrupole moment current and continuity equation and study a spin-valve structure consisting of two ferromagnets coupled to a quantum dot probing an impurity spin. The quadrupole backaction on their coupled spin results in spin torques and anisotropic spin relaxation which do not follow from standard spin-current considerations. We demonstrate the detection of the impurity spin by charge transport and its manipulation by electric fields.
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Affiliation(s)
- Michael M E Baumgärtel
- Peter Grünberg Institut, Forschungszentrum Jülich & JARA Jülich Aachen Research Alliance, D-52425 Jülich, Germany
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12
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STM Manipulation of Single Atoms and Molecules on Insulating Films. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/b978-0-08-096355-6.00002-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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13
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Fransson J, Galperin M. Spin seebeck coefficient of a molecular spin pump. Phys Chem Chem Phys 2011; 13:14350-7. [DOI: 10.1039/c1cp20720b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Markussen T, Stadler R, Thygesen KS. Graphical prediction of quantum interference-induced transmission nodes in functionalized organic molecules. Phys Chem Chem Phys 2011; 13:14311-7. [DOI: 10.1039/c1cp20924h] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Markussen T, Stadler R, Thygesen KS. The relation between structure and quantum interference in single molecule junctions. NANO LETTERS 2010; 10:4260-4265. [PMID: 20879779 DOI: 10.1021/nl101688a] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Quantum interference (QI) of electron pathways has recently attracted increased interest as an enabling tool for single-molecule electronic devices. Although various molecular systems have been shown to exhibit QI effects and a number of methods have been proposed for its analysis, simple guidelines linking the molecular structure to QI effects in the phase-coherent transport regime have until now been lacking. In the present work we demonstrate that QI in aromatic molecules is intimately related to the topology of the molecule's π system and establish a simple graphical scheme to predict the existence of QI-induced transmission antiresonances. The generality of the scheme, which is exact for a certain class of tight-binding models, is proved by a comparison to first-principles transport calculations for 10 different configurations of anthraquinone as well as a set of cross-conjugated molecular wires.
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Affiliation(s)
- Troels Markussen
- Center for Atomic-scale Materials Design, Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
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Barral M, Casanova D, Herrero S, Jiménez-Aparicio R, Torres M, Urbanos F. Tuning the Magnetic Moment of [Ru2(DPhF)3(O2CMe)L]+ Complexes (DPhF=N,N′-Diphenylformamidinate): A Theoretical Explanation of the Axial Ligand Influence. Chemistry 2010; 16:6203-11. [DOI: 10.1002/chem.200903404] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Ben-Moshe V, Beratan DN, Nitzan A, Skourtis SS. Chiral Control of Current Transfer in Molecules. ELECTRONIC AND MAGNETIC PROPERTIES OF CHIRAL MOLECULES AND SUPRAMOLECULAR ARCHITECTURES 2010; 298:259-78. [DOI: 10.1007/128_2010_101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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