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Li D, Tong Y, Bairagi K, Kelai M, Dappe YJ, Lagoute J, Girard Y, Rousset S, Repain V, Barreteau C, Brandbyge M, Smogunov A, Bellec A. Negative Differential Resistance in Spin-Crossover Molecular Devices. J Phys Chem Lett 2022; 13:7514-7520. [PMID: 35944010 DOI: 10.1021/acs.jpclett.2c01934] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We demonstrate, based on low-temperature scanning tunneling microscopy (STM) and spectroscopy, a pronounced negative differential resistance (NDR) in spin-crossover (SCO) molecular devices, where a FeII SCO molecule is deposited on surfaces. The STM measurements reveal that the NDR is robust with respect to substrate materials, temperature, and the number of SCO layers. This indicates that the NDR is intrinsically related to the electronic structure of the SCO molecule. Experimental results are supported by density functional theory (DFT) with nonequilibrium Green's function (NEGF) calculations and a generic theoretical model. While the DFT+NEGF calculations reproduce NDR for a special atomically sharp STM tip, the effect is attributed to the energy-dependent tip density of states rather than the molecule itself. We, therefore, propose a Coulomb blockade model involving three molecular orbitals with very different spatial localization as suggested by the molecular electronic structure.
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Affiliation(s)
- Dongzhe Li
- Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
- CEMES, Université de Toulouse, CNRS, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - Yongfeng Tong
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques UMR7162, 75013 Paris, France
| | - Kaushik Bairagi
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques UMR7162, 75013 Paris, France
| | - Massine Kelai
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques UMR7162, 75013 Paris, France
| | - Yannick J Dappe
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette, France
| | - Jérôme Lagoute
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques UMR7162, 75013 Paris, France
| | - Yann Girard
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques UMR7162, 75013 Paris, France
| | - Sylvie Rousset
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques UMR7162, 75013 Paris, France
| | - Vincent Repain
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques UMR7162, 75013 Paris, France
| | - Cyrille Barreteau
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette, France
| | - Mads Brandbyge
- Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
- Center for Nanostructured Graphene, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
| | | | - Amandine Bellec
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques UMR7162, 75013 Paris, France
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Li S, Yu H, Zhang G, Hu Y. Four probe electron transport characteristics of porphyrin phenylacetylene molecular devices. NEW J CHEM 2021. [DOI: 10.1039/d0nj04919k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel functional nano-electronic molecular system by tuning gate voltages and source voltages as well as changing lead-to-lead channels.
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Affiliation(s)
- Shanshan Li
- College of Chemical and Environmental Engineering, Harbin University of Science and Technology
- Harbin
- China
| | - Hong Yu
- College of Chemical and Environmental Engineering, Harbin University of Science and Technology
- Harbin
- China
| | - Guiling Zhang
- College of Chemical and Environmental Engineering, Harbin University of Science and Technology
- Harbin
- China
| | - Yangyang Hu
- College of Chemical and Environmental Engineering, Harbin University of Science and Technology
- Harbin
- China
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