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arXiv · 1408.1148

Cubic Rashba spin-orbit interaction of two-dimensional hole gas in strained-Ge/SiGe quantum well

Rai Moriya·Kentarou Sawano·Yusuke Hoshi·Satoru Masubuchi·Yasuhiro Shiraki·Andreas Wild·Christian Neumann·Gerhard Abstreiter·Dominique Bougeard·Takaaki Koga·Tomoki Machida
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Abstract

The spin-orbit interaction (SOI) of the two-dimensional hole gas in the inversion symmetric semiconductor Ge is studied in a strained-Ge/SiGe quantum well structure. We observed weak anti-localization (WAL) in the magnetoconductivity measurement, revealing that the WAL feature can be fully described by the k-cubic Rashba SOI theory. Furthermore, we demonstrated 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 mj = +-3/2 nature of the HH wave function.

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Rai Moriya, Kentarou Sawano, Yusuke Hoshi, Satoru Masubuchi, Yasuhiro Shiraki, Andreas Wild, Christian Neumann, Gerhard Abstreiter, Dominique Bougeard, Takaaki Koga, Tomoki Machida. 2014-08-05. Cubic Rashba spin-orbit interaction of two-dimensional hole gas in strained-Ge/SiGe quantum well. https://doi.org/10.1103/physrevlett.113.086601

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