Journal Article

FZJ-2024-02064

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Characterization of single in situ prepared interfaces composed of niobium and a selectively grown ( Bi 1 − x Sb x ) 2 Te 3 topological insulator nanoribbon

Janssen, K. ; Rüssmann, P.FZJ* ; Liberda, S.FZJ* ; Schleenvoigt, M.FZJ* ; Hou, X.FZJ* ; Jalil, A. R. ; Lentz, F.FZJ* ; Trellenkamp, S.FZJ* ; Bennemann, B. ; Zimmermann, E. (Corresponding author) ; Mussler, G.FZJ* ; Schüffelgen, P.FZJ* ; Schneider, C.-M.FZJ* ; Blügel, S.FZJ* ; Grützmacher, D.FZJ* ; Plucinski, L.FZJ* ; Schäpers, T.FZJ*

2024
APS College Park, MD

This record in other databases:  

Please use a persistent id in citations: doi:10.1103/PhysRevMaterials.8.034205  doi:10.34734/FZJ-2024-02064

Abstract: With increasing attention in Majorana physics for possible quantum bit applications, a large interest has been developed to understand the properties of the interface between an s-type superconductor and a topological insulator. Up to this point the interface analysis was mainly focused on in situ prepared Josephson junctions, which consist of two coupled single interfaces or to ex situ fabricated single interface devices. In our work we utilize a fabrication process, combining selective area growth and shadow evaporation which allows the characterization of a single in situ fabricated Nb/(Bi0.15Sb0.85)2Te3 nanointerface. The resulting high interface transparency is apparent by a zero bias conductance increase by a factor of 1.7. Furthermore, we present a comprehensive differential conductance analysis of our single in situ interface for various magnetic fields, temperatures, and gate voltages. Additionally, density functional theory calculations of the superconductor/topological insulator interface are performed in order to explain the peaklike shape of our differential conductance spectra and the origin of the observed smearing of conductance features.

---

Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. Elektronische Eigenschaften (PGI-6)
3. Quanten-Theorie der Materialien (PGI-1)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)
2. DFG project 390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)

Appears in the scientific report 2024

---

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

---