Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 83: Superconductivity: (General) Theory

TT 83.7: Vortrag

Donnerstag, 15. März 2018, 11:00–11:15, HFT-FT 101

Nonunitary triplet pairing from the Edelstein effect in noncentrosymmetric superconductors — •Grigory Tkachov — Wuerzburg University

The search for new forms of spin-triplet pairing is an important goal in superconductivity. The purpose of this contribution is to point out a surprising connection between the Edelstein effect in noncentrosymmetric superconductors [1] and the nonunitary (spin-polarized) pairing in triplet superfluids with a complex d vector [2]. It will be shown that the Edelstein effect leads to a new form of the nonunitary spin-triplet pairing [3] which is generated electrically by a supercurrent in an initially TR-invariant (unpolarized) system. Such a nonunitary state can be induced in a wide class of noncentrosymmetric superconductors, including those with a real d vector and proximity structures with d=0. I will also discuss how to detect the nonunitary spin-triplet pairing by Andreev reflection. These results indicate an unexplored route for electrical manipulation of spin-triplet superconductivity in noncentrosymmetric materials.

This work has been supported by the German Research Foundation (DFG grant No TK60/4-1).
V. M. Edelstein, Phys. Rev. Lett. 75, 2004 (1995).
A. J. Leggett, Rev. Mod. Phys. 47, 331 (1975).
G. Tkachov, Phys. Rev. Lett. 118, 016802 (2017).