Dresden 2026 – scientific programme
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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. Cuevas2,3 — 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