Zeeman-and orbital-driven phase shifts in planar Josephson junctions

0580343 - FZÚ 2024 RIV US eng J - Journal Article
Haxell, D.Z. - Coraiola, M. - Sabonis, D. - Hinderling, M. - ten Kate, S.C. - Cheah, E. - Křížek, Filip - Schott, R. - Wegscheider, W. - Nichele, F.
Zeeman-and orbital-driven phase shifts in planar Josephson junctions.
ACS Nano. Roč. 17, č. 18 (2023), s. 18139-18147. ISSN 1936-0851. E-ISSN 1936-086X
Institutional support: RVO:68378271
Keywords : super-semi hybrid 2DEG * shallow InAs * phase shift in Josephson Junctions * Andreev bound states
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 17.1, year: 2022
Method of publishing: Open access

We perform supercurrent and tunneling spectroscopy measurements on gate-tunable InAs/Al Josephson junctions (JJs) in an in-plane magnetic field and report on phase shifts in the current–phase relation measured with respect to an absolute phase reference. The impact of orbital effects is investigated by studying multiple devices with different superconducting lead sizes. At low fields, we observe gate-dependent phase shifts of up to φ0 = 0.5π, which are consistent with a Zeeman field coupling to highly transmissive Andreev bound states via Rashba spin–orbit interaction. A distinct phase shift emerges at larger fields, concomitant with a switching current minimum and the closing and reopening of the superconducting gap. These signatures of an induced phase transition, which might resemble a topological transition, scale with the superconducting lead size, demonstrating the crucial role of orbital effects.
Permanent Link: https://hdl.handle.net/11104/0349114