General interaction quenches in a Luttinger liquid
arXiv:2009.05693 · doi:10.1088/1572-9494/ac3644
Abstract
We discuss a general interaction quench in a Luttinger liquid described by a paired bosonic Hamiltonian. By employing Lie algebra, the post-quench time-evolved wavefunctions are obtained analytically, from which the time evolution of the entanglement in momentum space can be investigated. We note that depending on the choice of Bogoliubov quasiparticles, the expressions of wavefunctions, which describe time-evolved paired states, can take different forms. The correspondence between the largest entanglement eigenvalue in momentum space and the wavefunction overlap in quench dynamics is discussed, which generalizes the results of Dóra {\em et al} [2016, {\em Phys. Rev. Lett.} \textbf{117}, 010603]. A numerical demonstration on an XXZ lattice model is presented via the exact diagonalization method.
arXiv comment21 pages, 1 figure, including supplementary material
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