Journal Article

FZJ-2026-00214

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png GeSn quantum wells as a platform for spin-resolved hole transport

Kaul, P.FZJ* ; Karthein, J.FZJ* ; Buchhorn, J.FZJ* ; Kawano, T. ; Usubuchi, T. ; Ishihara, J. ; Rotaru, N. ; Del Vecchio, P. ; Concepcion, O.FZJ* ; Ikonic, Z. ; Grützmacher, D.FZJ* ; Zhao, Q.-T.FZJ* ; Moutanabbir, O. ; Kohda, M. (Corresponding author) ; Schäpers, T.FZJ* ; Buca, D. M. (Corresponding author)FZJ*

2025
Springer Nature London

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Please use a persistent id in citations: doi:10.1038/s43246-025-00934-9  doi:10.34734/FZJ-2026-00214

Abstract: The nascent group IV GeSn alloys are highly attractive for spintronics applications, including quantum computing, due to their ability to enable highly scalable fabrication and all-electrical spin manipulation. In this work, we conduct an in-depth study of a two-dimensional hole gas in a Ge/GeSn quantum well, exhibiting the integer quantum Hall effect and distinct Shubnikov-de Haas oscillations. Emphasis is given to the determination of the Landé g-factor and its pronounced anisotropy in this two-dimensional system, revealing values significantly higher than those in conventional Ge or SiGe/Ge systems. Moreover, by modeling the spin-orbit interaction using the Iordanskii-Lyanda-Geller-Pikus theory, crucial cubic Rashba spin-orbit interaction coefficients, are extracted and their significance is highlighted. This work provides the experimental validation of the theoretically predicted enhancements in spin-orbit interaction and g-factors in GeSn alloys compared to Ge. Additionally, it delivers essential parameters for the design of hole spin devices, such as hole qubits, utilizing GeSn-based structures on the Si platform.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)
2. 5234 - Emerging NC Architectures (POF4-523) (POF4-523)

Appears in the scientific report 2025

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Database coverage:
; ; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; DOAJ Seal ; Emerging Sources Citation Index ; Fees ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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