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arXiv cond-mat/0301351cond-mat.mes-hallcond-mat.str-el
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介观海森堡环中的持续自旋流

Persistent spin currents in mesoscopic Heisenberg rings

Florian Schuetz, Marcus Kollar, Peter Kopietz

摘要:

我们发现,在低温T下,一个大小为B的非均匀径向磁场在介观铁磁海森堡环周围产生一个持续的磁化电流。在最佳条件下,自旋电流可以达到g mu_B(T / hbar)exp [ - 2 pi(g mu_B B / Delta)^1/2 ],这是由领先阶自旋波理论得到的。这里g是旋磁因子,mu_B是玻尔磁子,Delta是基态和第一自旋波激发之间的能隙。磁化电流赋予环以电偶极矩。

英文摘要:

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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