scholarly journals Breaking time-reversal and translational symmetry at edges of d -wave superconductors: Microscopic theory and comparison with quasiclassical theory

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
N. Wall Wennerdal ◽  
A. Ask ◽  
P. Holmvall ◽  
T. Löfwander ◽  
M. Fogelström
Keyword(s):  
Time Reversal ◽  
Microscopic Theory ◽  
Translational Symmetry ◽  
Quasiclassical Theory ◽  
Breaking Time ◽  
D Wave

scholarly journals Quasiclassical theory of spontaneous currents at surfaces and interfaces of d-wave superconductors

2002 ◽  
Vol 318 (2-3) ◽  
pp. 162-179 ◽  
Author(s):  
M.H.S. Amin ◽  
A.N. Omelyanchouk ◽  
S.N. Rashkeev ◽  
M. Coury ◽  
A.M. Zagoskin
Keyword(s):  
Quasiclassical Theory ◽  
Surfaces And Interfaces ◽  
D Wave

scholarly journals Nonreciprocal transport in gate-induced polar superconductor SrTiO3

2020 ◽  
Vol 6 (13) ◽  
pp. eaay9120 ◽  
Author(s):  
Yuki M. Itahashi ◽  
Toshiya Ideue ◽  
Yu Saito ◽  
Sunao Shimizu ◽  
Takumi Ouchi ◽  
...  
Keyword(s):  
Quantum Transport ◽  
Time Reversal ◽  
Microscopic Theory ◽  
Orbit Interaction ◽  
Inversion Symmetry ◽  
Critical Temperatures ◽  
Rectification Effect ◽  
Inversion Time ◽  
Crossover Behavior ◽  
Polar Symmetry

Polar conductors/superconductors with Rashba-type spin-orbit interaction are potential material platforms for quantum transport and spintronic functionalities. One of their inherent properties is the nonreciprocal transport, where the rightward and leftward currents become inequivalent, reflecting spatial inversion/time-reversal symmetry breaking. Such a rectification effect originating from the polar symmetry has been recently observed at interfaces or bulk Rashba semiconductors, while its mechanism in a polar superconductor remains elusive. Here, we report the nonreciprocal transport in gate-induced two-dimensional superconductor SrTiO3, which is a Rashba superconductor candidate. In addition to the gigantic enhancement of nonreciprocal signals in the superconducting fluctuation region, we found kink and sharp peak structures around critical temperatures, which reflect the crossover behavior from the paraconductivity origin to the vortex origin, based on a microscopic theory. The present result proves that the nonreciprocal transport is a powerful tool for investigating the interfacial/polar superconductors without inversion symmetry, where rich exotic features are theoretically prognosticated.

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