Strong and Tunable Spin−Orbit Coupling of One-Dimensional Holes in Ge/Si Core/Shell Nanowires
Nano Letters2010Vol. 10(8), pp. 2956–2960
Citations Over TimeTop 10% of 2010 papers
Xiaojie Hao, Tao Tu, Gang Cao, Cheng Zhou, Hai-Ou Li, Guang‐Can Guo, Wayne Y. Fung, Zhongqing Ji, Guo‐Ping Guo, Wei Lü
Abstract
We investigate the low-temperature magneto-transport properties of individual Ge/Si core/shell nanowires. Negative magneto-conductance was observed, which is a signature of one-dimensional weak antilocalization of holes in the presence of strong spin--orbit coupling. The temperature and back gate dependences of phase coherence length, spin--orbit relaxation time, and background conductance were studied. Specifically, we show that the spin--orbit coupling strength can be modulated by more than five folds with an external electric field. These results suggest the Ge/Si nanowire system possesses strong and tunable spin--orbit interactions and may serve as a candidate for spintronics applications.
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