期刊
BRAZILIAN JOURNAL OF PHYSICS
卷 46, 期 3, 页码 239-247出版社
SPRINGER
DOI: 10.1007/s13538-015-0366-3
关键词
Non-equilibrium quantum physics; Quench dynamics; Spin systems; Disordered systems
资金
- NSF [DMR-1147430]
- CONACyT, Mexico
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1147430] Funding Source: National Science Foundation
In this work we provide an overview of our recent results about the quench dynamics of one-dimensional many-body quantum systems described by spin-1/2 models. To illustrate those general results, here we employ a particular and experimentally accessible initial state, namely the N,el state. Both cases are considered: clean chains without any disorder and disordered systems with static random on-site magnetic fields. The quantity used for the analysis is the probability for finding the initial state later in time, the so-called survival probability. At short times, the survival probability may decay faster than exponentially, Gaussian behaviors and even the limit established by the energy-time uncertainty relation are displayed. The dynamics at long times slows down significantly and shows a powerlaw behavior. For both scenarios, we provide analytical expressions that agree very well with our numerical results.
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