Effects of the intra-site Coulomb interaction on electron transport in an atom bridge |
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| Affiliation: | 1. Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea;2. School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, South Korea;3. Department of Chemistry, Chungnam National University, Yuseong, Daejeon 34134, South Korea;1. Beijing National Laboratory for Molecule Sciences, CAS Key Lab of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China;2. National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China |
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| Abstract: | The effects of the intra-site Coulomb interaction on the electron transport in an atom-sized bridge (an atom bridge) between a metal surface and a tip of a scanning tunneling microscope are investigated with the aid of the Hubbard Hamiltonian. The second-order self-energy with respect to the Coulomb interaction in a single site approximation is taken into account in calculating for the conductance of the bridge. We examine the conductance variation as a function of the stretching length of the bridge in the case where an electron-hole symmetry is broken and two types of the conductance jumps roughly in units of 2e2/h and 4e2/h exist. Numerical results show that a valley structure and a quasi-plateau appear at the upper side of the conductance jumps roughly in units of 4e2/h at low temperatures and at high temperatures, respectively. On the other hand, the reduction of the conductance is small and monotonic at the conductance jumps roughly in units of 2e2/h. |
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