Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity – Poster I

TT 22.1: Poster

Monday, March 9, 2026, 18:00–20:00, P1

Sextets in four-terminal Josephson junctions — •Miriam R. Ebert¹, David C. Ohnmacht¹, Wolfgang Belzig¹, and Juan C. Cuevas^2,3 — ¹Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — ²Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain — ³Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain

Multiterminal superconducting junctions have revitalized the investigation of the Josephson effect. One of the most interesting aspects of these hybrid systems is the occurrence of multi-Cooper pair tunneling processes that have no analog in two-terminal devices. Such correlated tunneling events are also intimately connected to the Andreev bound states (ABSs) supported by these structures. Josephson junctions with four superconducting terminals have attracted special attention because they are predicted to support ABSs with nontrivial topological properties. Here, we present a theoretical study of sextets, which are correlated tunneling processes involving three Cooper pairs and four different superconducting terminals [1]. We investigate how sextets can be identified from the analysis of the current-phase relation and show how sextets are connected to the hybridization of ABSs. Furthermore, we discuss their existence in recent experiments on four-terminal devices realized in hybrid Al/InAs heterostructures [2].
[1] M. R. Ebert et al., Phys. Rev. B 112, 195430 (2025)
[2] T. Antonelli et al., Phys. Rev. X 15, 031066 (2025)

Keywords: Cooper pairs; Multiterminal Josephson junctions; Andreev bound states; Supercurrent