We investigate the non-equilibrium dynamics of a one-dimensional spin-1/2 XXZ model at zero-temperature in the regime |Delta| < 1, initially prepared in a product state with two domain walls i.e, |down arrow... up down arrow ... up down arrow ... down arrow >. At early times, the two domain walls evolve independently and only after a calculable time a non-trivial interplay between the two emerges and results in the occurrence of a split Fermi sea. For Delta = 0, we derive exact asymptotic results for the magnetization and the spin current by using a semi-classical Wigner function approach, and we exactly determine the spreading of entanglement entropy exploiting the recently developed tools of quantum fluctuating hydrodynamics. In the interacting case, we analytically solve the Generalized Hydrodynamics equation providing exact expressions for the conserved quantities. We display some numerical results for the entanglement entropy also in the interacting case and we propose a conjecture for its asymptotic value.

Exact hydrodynamic solution of a double domain wall melting in the spin-1/2 XXZ model / Scopa, S.; Calabrese, P.; Dubail, J.. - In: SCIPOST PHYSICS. - ISSN 2542-4653. - 12:6(2022), pp. 1-28. [10.21468/scipostphys.12.6.207]

Exact hydrodynamic solution of a double domain wall melting in the spin-1/2 XXZ model

Scopa, S.;Calabrese, P.;Dubail, J.
2022-01-01

Abstract

We investigate the non-equilibrium dynamics of a one-dimensional spin-1/2 XXZ model at zero-temperature in the regime |Delta| < 1, initially prepared in a product state with two domain walls i.e, |down arrow... up down arrow ... up down arrow ... down arrow >. At early times, the two domain walls evolve independently and only after a calculable time a non-trivial interplay between the two emerges and results in the occurrence of a split Fermi sea. For Delta = 0, we derive exact asymptotic results for the magnetization and the spin current by using a semi-classical Wigner function approach, and we exactly determine the spreading of entanglement entropy exploiting the recently developed tools of quantum fluctuating hydrodynamics. In the interacting case, we analytically solve the Generalized Hydrodynamics equation providing exact expressions for the conserved quantities. We display some numerical results for the entanglement entropy also in the interacting case and we propose a conjecture for its asymptotic value.
2022
12
6
1
28
207
10.21468/scipostphys.12.6.207
https://arxiv.org/abs/2109.05249
Scopa, S.; Calabrese, P.; Dubail, J.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/131431
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