期刊
PHYSICAL REVIEW LETTERS
卷 113, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.205701
关键词
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资金
- Deutsche Akademie der Naturforscher Leopoldina [LPDS 2013-07]
- Austrian Science Fund (FWF) through SFB FoQuS [F4016]
In this Letter it is shown that dynamical quantum phase transitions in Loschmidt echos control the nonequilibrium dynamics of the order parameter after particular quantum quenches in systems with broken-symmetry phases. A direct connection between Loschmidt echos and the order parameter dynamics is established which links nonequilibrium microscopic probabilities to the system's macroscopic dynamical properties. These concepts are illustrated numerically using exact diagonalization for quantum quenches in the XXZ chain with initial Neel states. An outlook is given on how to explore these predictions experimentally with ultracold gases in optical lattices.
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