[NCTS IAC Lecture] Nonreciprocal transport and diode effect in superconductors
Title: [NCTS IAC Lecture] Nonreciprocal transport and diode effect in superconductors
Speaker: Prof. Naoto Nagaosa (RIKEN)
Time: 2023/6/19 (Mon.) 10:30-11:30
Place: NCTS Physics Lecture Hall, 4F, Chee-Chun Leung Cosmology Hall, NTU
Nonreciprocal transport (NRT) in noncentrosymmetric quantum materials attracts lot of interest . Time-reversal symmetry and inversion symmetry are relevant to NRT, and the magnetic field induced NRT is usually a small effect in metals and semiconductors since it requires the spin-orbit interaction and Zeeman effect . However, it is enhanced once the superconductivity sets in, which introduces a small energy scale, i.e., the superconducting gap, below which the bosonic transport dominates. I will discuss recent progress in this issue, i.e., the NRT and diode effect in superconductors especially in two-dimensions and quasi-one dimension. It includes the resistive states where the fluctuation of the superconducting order parameter gives the paraconductivity , the nonreciprocal resistivity dominated by vortex motion , nonreciprocal Josephson junction , phenomenological thery of superconducting diode effect , and geometric origin of NRT in nano-tube superconductors .
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 K. Misaki and N. Nagaosa, Rev. B 103 245302 (2021)
 James Jun He, Yukio Tanaka, Naoto Nagaosa, New J. Phys. 24 053014 (2022)
 James Jun He, Yukio Tanaka, Naoto Nagaosa, arXiv:2212.02183.