title: Strong and tunable spin--orbit coupling of one-dimensional holes in Ge/Si core/shell nanowires.
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.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, People's Republic of China.
authors.forename: Xiao-Jie
authors.initials: XJ
authors.lastname: Hao
authors.forename: Tao
authors.initials: T
authors.lastname: Tu
authors.forename: Gang
authors.initials: G
authors.lastname: Cao
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhou
authors.forename: Hai-Ou
authors.initials: HO
authors.lastname: Li
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo
authors.forename: Wayne Y
authors.initials: WY
authors.lastname: Fung
authors.forename: Zhongqing
authors.initials: Z
authors.lastname: Ji
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Guo
authors.forename: Wei
authors.initials: W
authors.lastname: Lu