title: Cubic Rashba spin-orbit interaction of a two-dimensional hole gas in a strained-Ge/SiGe quantum well.
abstract: The spin-orbit interaction (SOI) of a two-dimensional hole gas in the inversion symmetric semiconductor Ge is studied in a strained-Ge/SiGe quantum well structure. We observe weak antilocalization (WAL) in the magnetoconductivity measurement, revealing that the WAL feature can be fully described by the k-cubic Rashba SOI theory. Furthermore, we demonstrate electric field control of the Rashba SOI. Our findings reveal that the heavy hole (HH) in strained Ge is a purely cubic Rashba system, which is consistent with the spin angular momentum m(j) = ± 3/2 nature of the HH wave function.
authors.affiliation: Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
authors.forename: Rai
authors.initials: R
authors.lastname: Moriya
authors.affiliation: Advanced Research Laboratories, Tokyo City University, 8-15-1 Todoroki, Setagaya-ku, Tokyo 158-0082, Japan.
authors.forename: Kentarou
authors.initials: K
authors.lastname: Sawano
authors.affiliation: Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan and Advanced Research Laboratories, Tokyo City University, 8-15-1 Todoroki, Setagaya-ku, Tokyo 158-0082, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Hoshi
authors.affiliation: Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan and Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
authors.forename: Satoru
authors.initials: S
authors.lastname: Masubuchi
authors.affiliation: Advanced Research Laboratories, Tokyo City University, 8-15-1 Todoroki, Setagaya-ku, Tokyo 158-0082, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Shiraki
authors.affiliation: Walter Schottky Institut and Physics Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany and Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstraße 31, 93040 Regensburg, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Wild
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstraße 31, 93040 Regensburg, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Neumann
authors.affiliation: Walter Schottky Institut and Physics Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany and Institute for Advanced Study, Technische Universität München, Lichtenbergstraße 2a, 85748 Garching, Germany.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Abstreiter
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstraße 31, 93040 Regensburg, Germany.
authors.forename: Dominique
authors.initials: D
authors.lastname: Bougeard
authors.affiliation: Division of Electronics for Informatics, Graduate School of Information Science and Technology, Hokkaido University, Hokkaido 060-0814, Japan.
authors.forename: Takaaki
authors.initials: T
authors.lastname: Koga
authors.affiliation: Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan and Institute for Nano Quantum Information Electronics, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
authors.forename: Tomoki
authors.initials: T
authors.lastname: Machida