Journal Article

FZJ-2026-01419

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Controlling the magnetotransport properties of magnetic topological insulator Cr x ( Bi y Sb 1 − y ) 2 − x Te 3 thin films via molecular beam epitaxy

Karthein, J. (Corresponding author)FZJ* ; Buchhorn, J.FZJ* ; Underwood, K.FZJ* ; Jalil, A. R.FZJ* ; Vaßen-Carl, M.FZJ* ; Schüffelgen, P.FZJ* ; Grützmacher, D.FZJ* ; Schäpers, T.FZJ*

2025
APS College Park, MD

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Please use a persistent id in citations: doi:10.1103/8m2h-83zm  doi:10.34734/FZJ-2026-01419

Abstract: In this work we present a systematic in-depth study of how we can alter the magnetotransport properties of magnetic topological insulator thin films by tuning the parameters of the molecular-beam epitaxy. First, we show how a varying substrate temperature changes the surface morphology and, when chosen properly, leads to a high crystal quality. Next, the effect of the chromium concentration on the film roughness and crystal quality is investigated. Finally, both the substrate temperature and the chromium concentration are investigated with respect to their effect on the magnetotransport properties of the magnetic topological insulator thin films. It becomes apparent that the substrate temperature and the chromium concentration can be used to tune the Fermi level of the film which allows to make the material intrinsically charge neutral. A very low chromium concentration furthermore allows to tune the magnetic topological insulator into a regime where strong superconducting correlations can be expected when combining the material with a superconductor.

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

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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. DFG project G:(GEPRIS)491798118 - Magnetische topologische Isolatoren für robuste Majorana Zustände (491798118) (491798118)
3. DFG project G:(GEPRIS)390534769 - EXC 2004: Materie und Licht für Quanteninformation (ML4Q) (390534769) (390534769)

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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

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