Non-equilibrium time evolution and rephasing in the quantum sine-Gordon model
| Autor: | Gergely Zaránd, David X. Horvath, Gábor Takács, Izabella Lovas, Márton Kormos |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
High Energy Physics - Theory Field (physics) Statistical Mechanics (cond-mat.stat-mech) Phase (waves) Time evolution Degrees of freedom (physics and chemistry) Non-equilibrium thermodynamics FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Classical mechanics High Energy Physics - Theory (hep-th) Quantum Gases (cond-mat.quant-gas) 0103 physical sciences Sine 010306 general physics Condensed Matter - Quantum Gases Quantum Quantum tunnelling Condensed Matter - Statistical Mechanics |
| DOI: | 10.48550/arxiv.1809.06789 |
| Popis: | We discuss the non-equilibrium 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 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. Comment: 34 pages, 9 figures |
| Databáze: | OpenAIRE |
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