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S e p t e m b e r 2 4 - 2 6 , 2 0 1 8 | B u d a p e s t , H u n g a r y
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Magnetic Materials 2018
Materials Science and Nanotechnology
|
Volume 2
MAGNETISM AND
MAGNETIC MATERIALS
2
nd
International Conference on
Mater Sci Nanotechnol 2018, Volume 2
PROBING TRIPLET SUPERCONDUCTIVITY BY THE ANDREEV-EDELSTEIN
EFFECT
Grigory Tkachov
Wuerzburg University, Germany
A
n unambiguous identification of spin-triplet superconductivity is one of the outstanding problems in condensed matter physics.
The author will present a new approach to this problem based on using Andreev reflection in combination with the Edelstein
effect. The latter refers to the spin magnetization produced by an electric supercurrent in a noncentrosymmetric superconductor.
The author will discuss the combined Andreev-Edelstein effect which consists in the generation of equal-spin triplet Andreev re-
flection by a supercurrent. This effect is a smoking gun for the nonunitary triplet pairing which is characterized by cooper-pair spin
magnetism. Both intrinsic and proximity-induced on centrosymmetric superconductors will be addressed. In the latter case, we
will focus on the topological insulator surface states which, in general, offer an excellent playground for studying the Edelstein and
related magnetoelectric effects.
Fig. 1.
Schematic of a topological insulator (TI) proximitized by a current-biased superconductor (S); j is the supercurrent density.
The supercurrent generates nonunitary triplet pairing described by a complex pair amplitude f with orthogonal real and imaginary
parts. The axial vector if × f* characterizes the spin magnetization of the nonunitary triplet condensate