Journal Article

FZJ-2026-01356

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Superconducting diode effect in selectively grown topological insulator based Josephson junctions

Behner, G.FZJ* ; Jalil, A. R.FZJ* ; Grützmacher, D.FZJ* ; Schäpers, T. (Corresponding author)FZJ*

2026
Inst. Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/gc7k-rn8q  doi:10.34734/FZJ-2026-01356

Abstract: The Josephson diode effect, where the switching current magnitude depends on its direction, arises when both time-reversal and inversion symmetries are broken, often achieved by a combination of spin-orbit interaction and applied magnetic fields. Taking advantage of the strong spin-orbit coupling inherent in three-dimensional topological insulators, we study this phenomenon in Nb/Bi0.8⁢Sb1.2⁢Te3/Nb Josephson weak-link junctions. Under an in-plane magnetic field perpendicular to the current direction, we observe a pronounced Josephson diode effect with efficiencies up to 7%. A crucial component of this behavior is the nonsinusoidal current-phase relationship and an anomalous phase shift, which we attribute to the presence of a ballistic supercurrent component due to the surface states. These findings open up new avenues for harnessing and controlling the Josephson diode effect in topological material systems.

Keyword(s): Information and Communication (1st) ; Condensed Matter Physics (2nd)

Note: Bavarian Ministry of Economic Affairs, Regional Development and Energy within Bavaria's High-Tech Agenda Project ”Bausteine für das Quantencomputing auf Basis Topologischer Materialien mit Experimentellen und Theoretischen Ansätzen” (Grant No. 07 02/686 58/1/21 1/22 2/23)

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA Institut Green IT (PGI-10)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)
2. EXC 2004:  Matter and Light for Quantum Computing (ML4Q) (390534769) (390534769)
3. DFG project G:(GEPRIS)491798118 - Magnetische topologische Isolatoren für robuste Majorana Zustände (491798118) (491798118)

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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