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  • Title: Cubic Rashba spin-orbit interaction of a two-dimensional hole gas in a strained-Ge/SiGe quantum well.
    Author: Moriya R, Sawano K, Hoshi Y, Masubuchi S, Shiraki Y, Wild A, Neumann C, Abstreiter G, Bougeard D, Koga T, Machida T.
    Journal: Phys Rev Lett; 2014 Aug 22; 113(8):086601. PubMed ID: 25192115.
    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.
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