Hydrodynamical phase transition for domain-wall melting in the XY chain

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

We study the melting of a domain wall, prepared as a certain low-energy excitation above the ferromagnetic ground state of the XY chain. In a well defined parameter regime the time-evolved magnetization profile develops sharp kink-like structures in the bulk, showing features of a phase transition in the hydrodynamic scaling limit. The transition is of purely dynamical nature and can be attributed to the appearance of a negative effective mass term in the dispersion. The signatures are also clearly visible in the entanglement profile measured along the front region, which can be obtained by covariance-matrix methods despite the state being non-Gaussian.
Originalspracheenglisch
Aufsatznummer161117(R)
FachzeitschriftPhysical Review / B
Jahrgang98
DOIs
PublikationsstatusVeröffentlicht - 22 Okt 2018

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Excitation energy
Domain walls
Covariance matrix
Ground state
domain wall
Magnetization
Melting
Hydrodynamics
Phase transitions
melting
profiles
matrix methods
hydrodynamics
signatures
scaling
magnetization
ground state
excitation
energy

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    Hydrodynamical phase transition for domain-wall melting in the XY chain. / Eisler, Viktor; Maislinger, Florian.

    in: Physical Review / B, Jahrgang 98, 161117(R), 22.10.2018.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    abstract = "We study the melting of a domain wall, prepared as a certain low-energy excitation above the ferromagnetic ground state of the XY chain. In a well defined parameter regime the time-evolved magnetization profile develops sharp kink-like structures in the bulk, showing features of a phase transition in the hydrodynamic scaling limit. The transition is of purely dynamical nature and can be attributed to the appearance of a negative effective mass term in the dispersion. The signatures are also clearly visible in the entanglement profile measured along the front region, which can be obtained by covariance-matrix methods despite the state being non-Gaussian.",
    keywords = "cond-mat.stat-mech, quant-ph",
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    AB - We study the melting of a domain wall, prepared as a certain low-energy excitation above the ferromagnetic ground state of the XY chain. In a well defined parameter regime the time-evolved magnetization profile develops sharp kink-like structures in the bulk, showing features of a phase transition in the hydrodynamic scaling limit. The transition is of purely dynamical nature and can be attributed to the appearance of a negative effective mass term in the dispersion. The signatures are also clearly visible in the entanglement profile measured along the front region, which can be obtained by covariance-matrix methods despite the state being non-Gaussian.

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