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Article Dans Une Revue Physical Review E : Statistical, Nonlinear, and Soft Matter Physics Année : 2013

Driven isotropic Heisenberg spin chain with arbitrary boundary twisting angle: Exact results

Résumé

We consider an open isotropic Heisenberg quantum spin chain, coupled at the ends to boundary reservoirs polarized in different directions, which sets up a twisting gradient across the chain. Using a matrix product ansatz, we calculate the exact magnetization profiles and magnetization currents in the nonequilibrium steady state of a chain with N sites. The magnetization profiles are harmonic functions with a frequency proportional to the twisting angle theta. The currents of the magnetization components lying in the twisting plane and in the orthogonal direction behave qualitatively differently: In-plane steady-state currents scale as 1/N-2 for fixed and sufficiently large boundary coupling, and vanish as the coupling increases, while the transversal current increases with the coupling and saturates to 2 theta/N.

Dates et versions

hal-01275585 , version 1 (17-02-2016)

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V. Popkov, Dragi Karevski, G. M. Schütz. Driven isotropic Heisenberg spin chain with arbitrary boundary twisting angle: Exact results. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, 2013, 88 (6), ⟨10.1103/PhysRevE.88.062118⟩. ⟨hal-01275585⟩
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