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Quantization of conductance minimum and index theorem

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Title: Quantization of conductance minimum and index theorem
Authors: Ikegaya, Satoshi Browse this author
Suzuki, Shu-Ichiro Browse this author
Tanaka, Yukio Browse this author
Asano, Yasuhiro Browse this author →KAKEN DB
Issue Date: 19-Aug-2016
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 94
Issue: 5
Start Page: 054512
Publisher DOI: 10.1103/PhysRevB.94.054512
Abstract: We discuss the minimum value of the zero-bias differential conductance G(min) in a junction consisting of a normal metal and a nodal superconductor preserving time-reversal symmetry. Using the quasiclassical Green function method, we show that G(min) is quantized at (4e(2)/h)N-ZES in the limit of strong impurity scatterings in the normal metal at the zero temperature. The integer N-ZES represents the number of perfect transmission channels through the junction. An analysis of the chiral symmetry of the Hamiltonian indicates that N-ZES corresponds to the Atiyah-Singer index in mathematics.
Rights: ©2016 American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浅野 泰寛

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