| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Persistent current in a magnetized Rashba ring |
| Zhang Lin(张林)a)b)† and Wang Jun(汪军)a)‡ |
| a Department of Physics, Southeast University, Nanjing 210096, China; b Department of Applied Physics, College of Science, Nanjing Forestry University, Nanjing 210037, China |
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Abstract We theoretically study the persistent currents flowing in a Rashba quantum ring subjected to the Rashba spin-orbit interaction. By introducing uniform or nonuniform magnetization into the ring, we find that a nonzero persistent charge current circulates in the ring, which stems from the original equilibrium spin current due to the Rashba spin-orbit interaction. Because of broken time reversal symmetry, the two oppositely flowing spin-up and spin-down charge currents of the equilibrium spin current are no longer equal, and so a net persistent charge current can flow in the system. It is also found that the persistent current can be modulated by the Fermi energy, the Rashba spin-orbit interaction strength and the magnetization in the ring. Moreover, the magnetization perpendicular to the ring plane can optimize the current. The persistent current flowing in the ring is a manifestation of the nonzero equilibrium spin current existing in the ring.
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Received: 06 April 2011
Revised: 08 August 2011
Accepted manuscript online:
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PACS:
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72.25.Dc
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(Spin polarized transport in semiconductors)
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72.25.Mk
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(Spin transport through interfaces)
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73.23.Ra
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(Persistent currents)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 110704032 and 110704033), the Natural Science Foundation of Jiangsu Province of China (Grant No. BK2010416), and the National Basic Research Development Program of China (Grant No. 2009CB945504). |
Cite this article:
Zhang Lin(张林) and Wang Jun(汪军) Persistent current in a magnetized Rashba ring 2011 Chin. Phys. B 20 127203
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