Asymmetric Diffusion and the Energy Gap above the 111 Ground State of the Quantum Xxz Model
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Asymmetric Diffusion and the Enrgy Gap above the 111 Ground State of the Quantum Xxz Model
We consider the anisotropic three dimensional XXZ Heisenberg ferromagnet in a cylinder with axis along the 111 direction and boundary conditions that induce ground states describing an interface orthogonal to the cylinder axis. Let L be the linear size of the basis of the cylinder. Because of the breaking of the continuous symmetry around the ^ z axis, the Goldstone theorem implies that the spe...
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