Phase-engineering the Andreev band structure of a three-terminal Josephson junction

0580341 - FZÚ 2024 RIV US eng J - Journal Article
Coraiola, M. - Haxell, D.Z. - Sabonis, D. - Weisbrich, H. - Svetogorov, A.E. - Hinderling, M. - ten Kate, S.C. - Cheah, E. - Křížek, Filip - Schott, R. - Wegscheider, W. - Cuevas, J.C. - Belzig, W. - Nichele, F.
Phase-engineering the Andreev band structure of a three-terminal Josephson junction.
Nature Communications. Roč. 14, č. 1 (2023), č. článku 6784. E-ISSN 2041-1723
Institutional support: RVO:68378271
Keywords : InAs shallow quantum well * Andreev band structure * multi-terminal Josephson junctions * phase-engineering
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 16.6, year: 2022
Method of publishing: Open access

In hybrid Josephson junctions with three or more superconducting terminals coupled to a semiconducting region, Andreev bound states may form unconventional energy band structures, or Andreev matter, which are engineered by controlling superconducting phase differences. Here we report tunnelling spectroscopy measurements of three-terminal Josephson junctions realised in an InAs/Al heterostructure. The three terminals are connected to form two loops, enabling independent control over two phase differences and access to a synthetic Andreev band structure in the two-dimensional phase space. Our results demonstrate a phase-controlled Andreev molecule, originating from two discrete Andreev levels that spatially overlap and hybridise. Signatures of hybridisation are observed in the form of avoided crossings in the spectrum and band structure anisotropies in the phase space, all explained by a numerical model.

Permanent Link: https://hdl.handle.net/11104/0349112