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Entanglement spectrum of the degenerative ground state of Heisenberg ladders in a time-dependent magnetic field

Predin, Sonja


We investigate the relationship between the entanglement and subsystem Hamiltonians in the perturbative regime of strong coupling between subsystems. One of the two conditions that guarantees the proportionality between these Hamiltonians obtained by using the nondegenerate perturbation theory within the first order is that the unperturbed ground state has a trivial entanglement Hamiltonian. ...


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