Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 55: Superconductivity: Tunnelling and Josephson Junctions

TT 55.5: Vortrag

Donnerstag, 19. März 2020, 10:45–11:00, HSZ 204

Skew Andreev reflection in superconducting junctions — •Andreas Costa1, Alex Matos-Abiague2, and Jaroslav Fabian11University of Regensburg, Germany — 2Wayne State University Detroit, USA

Superconducting junctions offer unique possibilities to generate and control charge and spin supercurrents, particularly in combination with the antagonistic ferromagnetic phase. The interplay of superconductivity and ferromagnetism gets most fascinating in the presence of interfacial spin-orbit coupling (SOC), which invariably results from broken inversion symmetry. Our work [1] investigates the impact of SOC on the characteristic Andreev reflection (AR) processes at the interfaces of ferromagnet/superconductor junctions. We demonstrate that the resulting skew ARs spatially separate charge carriers and generate giant Hall currents in the ferromagnet, accompanied by sizable transverse supercurrent responses in the superconductor. Apart from that, the spin-active interface acts like a transverse electron spin filter and all predicted charge currents simultaneously come along with their spin current counterparts. We comment on various experimentally feasible ways to tune the currents, making them promising candidates for spintronics applications. In a next step, our results might become relevant for integrating Hall physics into Josephson junctions.
This work was supported by ENB IDK Topological Insulators, DFG SFB 1277 (B07), DARPA Grant DP18AP900007, and US ONR Grant N000141712793.

[1] Costa et al., Phys. Rev. B 100, 060507(R) (2019).

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