Abstract
The formation of an equilibrium state from an uncorrelated thermal one through the dynamical crossing of a phase transition is a central question of quantum many-body physics. During such crossing, the system breaks its symmetry by establishing numerous uncorrelated regions separated by spontaneously generated defects, whose emergence obeys a universal scaling law with quench duration. The ensuing re-equilibrating or “coarse-graining” stage is governed by the evolution and interactions of such defects under system-specific and external constraints. We perform a detailed numerical characterisation of the entire non-equilibrium process associated with the Bose–Einstein condensation phase transition in a three-dimensional gas of ultracold atoms, addressing subtle issues and demonstrating the quench-induced decoupling of condensate atom number and coherence growth during the re-equilibration process. Our findings agree, in a statistical sense, with experimental observations made at the later stages of the quench, and provide valuable information and useful dynamical visualisations in currently experimentally inaccessible regimes.
| Original language | English |
|---|---|
| Article number | 24 |
| Journal | Communications Physics |
| Volume | 1 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2018 Dec 1 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Dynamical equilibration across a quenched phase transition in a trapped quantum gas. / Liu, I. K.; Donadello, S.; Lamporesi, G.; Ferrari, G.; Gou, S. C.; Dalfovo, F.; Proukakis, N. P.
In: Communications Physics, Vol. 1, No. 1, 24, 01.12.2018.Research output: Contribution to journal › Article
TY - JOUR
T1 - Dynamical equilibration across a quenched phase transition in a trapped quantum gas
AU - Liu, I. K.
AU - Donadello, S.
AU - Lamporesi, G.
AU - Ferrari, G.
AU - Gou, S. C.
AU - Dalfovo, F.
AU - Proukakis, N. P.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The formation of an equilibrium state from an uncorrelated thermal one through the dynamical crossing of a phase transition is a central question of quantum many-body physics. During such crossing, the system breaks its symmetry by establishing numerous uncorrelated regions separated by spontaneously generated defects, whose emergence obeys a universal scaling law with quench duration. The ensuing re-equilibrating or “coarse-graining” stage is governed by the evolution and interactions of such defects under system-specific and external constraints. We perform a detailed numerical characterisation of the entire non-equilibrium process associated with the Bose–Einstein condensation phase transition in a three-dimensional gas of ultracold atoms, addressing subtle issues and demonstrating the quench-induced decoupling of condensate atom number and coherence growth during the re-equilibration process. Our findings agree, in a statistical sense, with experimental observations made at the later stages of the quench, and provide valuable information and useful dynamical visualisations in currently experimentally inaccessible regimes.
AB - The formation of an equilibrium state from an uncorrelated thermal one through the dynamical crossing of a phase transition is a central question of quantum many-body physics. During such crossing, the system breaks its symmetry by establishing numerous uncorrelated regions separated by spontaneously generated defects, whose emergence obeys a universal scaling law with quench duration. The ensuing re-equilibrating or “coarse-graining” stage is governed by the evolution and interactions of such defects under system-specific and external constraints. We perform a detailed numerical characterisation of the entire non-equilibrium process associated with the Bose–Einstein condensation phase transition in a three-dimensional gas of ultracold atoms, addressing subtle issues and demonstrating the quench-induced decoupling of condensate atom number and coherence growth during the re-equilibration process. Our findings agree, in a statistical sense, with experimental observations made at the later stages of the quench, and provide valuable information and useful dynamical visualisations in currently experimentally inaccessible regimes.
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U2 - 10.1038/s42005-018-0023-6
DO - 10.1038/s42005-018-0023-6
M3 - Article
AN - SCOPUS:85051983166
VL - 1
JO - Communications Physics
JF - Communications Physics
SN - 2399-3650
IS - 1
M1 - 24
ER -