Orbital magnetic phase and pure persistent spin current in spin-orbit coupling mesoscopic ringsGuang-Yao Huang and Shi-Dong Liang
State Key Laboratory of Optoelectronic Material and Technology and School of Physics and Engineering, Sun Yat-Sen University - Guangzhou, 510275, PRC
received 23 February 2009; accepted in final form 2 June 2009; published June 2009
published online 9 July 2009
By solving the Rashba model of mesoscopic rings, we give analytically the ground-state properties of the ring, including the spin polarization, the persistent charge and spin currents (PCC and PSC). These ground-state properties can be given based on four kinds of electron numbers in rings. The effect of the self-inductance of the ring leads to the self-sustained magnetic flux (SSMF) and the self-sustained PCC and PSC, which break spontaneously time-reversal symmetry to form orbital magnetic phase (OMP). To tune the spin-orbit coupling strength or electron number of the ring can induce the phase transition between the OMP and non-OMP. For exact one-dimensional rings we find the coexistence of the pure PSC and SSMF. This property of the pure PSC may provide a new scheme to measure the pure PSC.
72.10.Bg - General formulation of transport theory.
72.25.Dc - Spin polarized transport in semiconductors .
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