Nonequilibrium time evolution and rephasing in the quantum sine-Gordon model

D. X. Horváth, I. Lovas, M. Kormos, G. Takács, G. Zaránd

Research output: Contribution to journalArticle

1 Citation (Scopus)


We discuss the nonequilibrium time evolution of the phase field in the sine-Gordon model using two very different approaches: the truncated Wigner approximation and the truncated conformal space approach. We demonstrate that the two approaches agree for a period covering the first few oscillations, thereby giving a solid theoretical prediction in the framework of the sine-Gordon model, which is thought to describe the dynamics of two bosonic condensates in quasi-one-dimensional traps coupled via a Josephson tunneling term. We conclude, however, that the recently observed phase-locking behavior cannot be explained in terms of homogeneous sine-Gordon dynamics, which hints at the role of other degrees of freedom or inhomogeneity in the experimental system.

Original languageEnglish
Article number013613
JournalPhysical Review A
Issue number1
Publication statusPublished - Jul 12 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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