Xiao-Jie Hao, Tao Tu, Gang Cao, Cheng Zhou, Hai-Ou Li, Guang-Can Guo, Wayne Y. Fung, Zhongqing Ji, Guo-Ping Guo, Wei Lu
Published 2010-08-11Version 1
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 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.
Comments: 14 pages with Supporting Information
Journal: Nano Letters 10(8), 2956 (2010)
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