Persistent spin and charge currents and magnification effects in open ring conductors subject to Rashba coupling

Abstract

We analyze the effect of Rashba spin-orbit coupling and of a local tunnel barrier on the persistent spin and charge currents in a one-dimensional conducting Aharonov-Bohm (AB) ring symmetrically coupled to two leads. First, as an important consequence of the spin-splitting, it is found that a persistent spin current can be induced which is not simply proportional to the charge current. Second, a magnification effect of the persistent spin current is shown when one tunes the Fermi energy near the Fano-type antiresonances of the total transmission coefficient governed by the tunnel barrier strength. As an unambiguous signature of spin-orbit coupling we also show the possibility to produce a persistent pure spin current at the interference zeros of the transmittance. This widens the possibilities of employing mesoscopic conducting rings in phase-coherent spintronics applications.

6 pages, 5 figures, to appear in PRB

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Cited by in corpus (8)

• Diffusive and precessional spin dynamics in a two-dimensional electron gas with disorder: a gauge theory view
• Determination of Rashba and Dresselhaus spin-orbit fields
• Spin-orbit coupling effect on the persistent currents in mesoscopic ring with an Anderson impurity
• Orbital magnetic phase and pure persistent spin current in spin-orbit coupling mesoscopic rings
• Interference of heavy holes in an Aharonov-Bohm ring
• Energy current magnification in coupled oscillator loops
• Theory of spin polarization in mesoscopic spin-orbit coupling systems
• SU(2) symmetry in a Hubbard model with spin-orbit coupling