Persistent spin currents in mesoscopic Heisenberg rings

Details Persistent spin currents in mesoscopic Heisenberg rings Persistent spin currents in mesoscopic Heisenberg rings

2003-01-20

arxiv.org/abs/cond-mat/0301351v2

Phys. Rev. Lett. 91, 017205 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, published version

Scientific paper

10.1103/PhysRevLett.91.017205

We show that at low temperatures T an inhomogeneous radial magnetic field with magnitude B gives rise to a persistent magnetization current around a mesoscopic ferromagnetic Heisenberg ring. Under optimal conditions this spin current can be as large as g mu_B (T / hbar) exp [ - 2 pi (g mu_B B / Delta )^1/2 ], as obtained from leading-order spin-wave theory. Here g is the gyromagnetic factor, mu_B is the Bohr magneton, and Delta is the energy gap between the ground state and the first spin-wave excitation. The magnetization current endows the ring with an electric dipole moment.

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