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Exact phase diagram of the XXZ Heisenberg chain in a staggered magnetic field

Zhang, H. P. et al.
arXiv (All) · Papers
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strongly-correlated-electrons
We study the phase diagram of the spin-1/2 XXZ Heisenberg chain in a staggered magnetic field. An exact solution is obtained along the phase boundary, where the exchange anisotropy and the staggered-field strength satisfy an exact analytical relation, yielding a highly degenerate manifold of ground
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