Theory of Tunneling Spectroscopy of Multi-Band Superconductors
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概要
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We present the derivation of boundary conditions on a wave function at the normal metal/superconductor (N/S) interface by extending the tight-binding approach developed for semiconducting heterostructures [Phys. Rev. 27 (1983) 3519]. Based on these boundary conditions, we formulate a quantitative theory for tunneling spectroscopy in N/S junctions, where a superconductor is characterized by complex non-parabolic energy spectrum beyond effective mass approximation. As an application to single-band unconventional superconductors, we re-derive the known conductance formula [Phys. Rev. Lett. 74 (1995) 3451] with generalized definition of a normal-state conductance. We further apply the model to junctions between normal metals (N) and multi-band iron-based superconductors (FeBS). Our calculations show that tunneling studies of (100) oriented N/FeBS junctions allow to distinguish between the s_{\pm} and the s_{++} order parameter symmetry in FeBS. In low transparent N/FeBS junctions with the s_{+-} symmetry in FeBS, finite energy subgap Andreev bound states are formed due to sign change of pair potential between different Fermi surface pockets. Another fingerprint of the s_{+-} symmetry in FeBS is suppressed Andreev conductance in high transparent (100) N/FeBS junctions compared to the case of the s_{++} symmetry. Our results may serve as a basis for quantitative tunneling spectroscopy of FeBS.
- 2013-03-15
著者
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Tanaka Yukio
Department Of Applied Physics Nagoya University
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Yada Keiji
Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
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Golubov Alexander
Faculty of Science and Technology and MESA+ Institute of Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
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Burmistrova Angelina
Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 1(2), Leninskie gory, GSP-1, Moscow 119991, Russian Federation
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Devyatov Igor
Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, 1(2), Leninskie gory, GSP-1, Moscow 119991, Russian Federation
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