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TT: Fachverband Tiefe Temperaturen

TT 53: Topology: Other Topics

TT 53.10: Vortrag

Freitag, 21. März 2025, 12:00–12:15, H32

Topological Signatures and Induced Triplet Pairing in Proximitized Quantum Hall - Superconductor Heterostructures — •Yuriko Baba, Rafael Sánchez, Alfredo Levy Yeyati, and Pablo Burset — Department of Theoretical Condensed Matter Physics, Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain

In a quantum Hall (QH) state, the proximity to a superconductor (SC) leads to the formation of hybridized electron-hole states called chiral Andreev edge states (CAES). Although the strong magnetic fields required for the QH effect are detrimental to superconductivity, recent experiments have achieved QH-SC hybrid junctions based on InAs 2DEGs [1], graphene [2], and magnetic topological insulators [3]. In this work, we theoretically study the formation of CAES in QH-SC hybrid junctions on a 2DEG. Using numerical simulations in Kwant [4], we study the formation of spin-polarized triplet Cooper pairs induced by Rashba spin-orbit coupling and Zeeman splitting [5], which may be important in 2DEG devices. We also consider the effect of the geometry of nanodevices in planar junctions [6] and in a narrow-finger configuration. In these geometries, the coupling of CAES can induce a topological band inversion and trivial localized states, both of which show particular signatures in non-local electron transport.

[1] Hatefipour et al, Nano Lett. 22, 6173 (2022);
[2] Zhao et al., Nat. Phys. 16, 862 (2020);
[3] Uday et al., Nat. Phys. 20, 1589 (2024);
[4] Groth et al., NJP. 16, 063065 (2014);
[5] Arrachea et al., arXiv:2310.13729;
[6] David at al. PRB 107, 125416 (2023).

Keywords: Chiral Andreev states; Quantum Hall effect; Electronic transport; Proximity induced superconductivity; Topological superconductivity