Controlling soliton excitations in Heisenberg spin chain through magic angle

Details Controlling soliton excitations in Heisenberg spin chain through magic angle Controlling soliton excitations in Heisenberg spin chain through magic angle

2008-02-12

arxiv.org/abs/0802.1610v4

Physical Review E 79, 016606 (2009)

Physics

Quantum Physics

7 pages 4 figures

Scientific paper

10.1103/PhysRevE.79.016606

We study the nonlinear dynamics of collective excitation in a $N$-site $XXZ$ quantum spin chain, which is manipulated by an oblique magnetic field. We show that, when the tilted field is applied along the magic angle $\theta_{0} =\pm\arccos \sqrt{1/3}$, the anisotropic Heisenberg spin chain becomes isotropic and thus an free propagating spin wave is stimulated. And in the regime of the tilted angle larger and smaller then the magic angle, two types of nonlinear excitations appear, which are bright soliton and dark soliton.

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