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Dynamical quantum phase transitions in discrete time crystals

zqyin 添加于 2017-12-18 09:52 | 1000 次阅读 | 0 个评论

作者
Kosior A, Sacha K
摘要
Discrete time crystals are related to non-equilibrium dynamics of periodically driven quantum many-body systems where the discrete time translation symmetry of the Hamiltonian is spontaneously broken into another discrete symmetry. Recently, the concept of phase transitions has been extended to non-equilibrium dynamics of time-independent systems induced by a quantum quench, i.e. a sudden change of some parameter of the Hamiltonian. There, the return probability of a system to the ground state reveals singularities in time which are dubbed dynamical quantum phase transitions. We show that the quantum quench in a discrete time crystal leads to dynamical quantum phase transitions where the return probability of a periodically driven system to a Floquet eigenstate before the quench reveals singularities in time. It indicates that dynamical quantum phase transitions are not restricted to time-independent systems and can be also observed in systems that are periodically driven.
详细资料
- 关键词: cond-mat.quant-gas; cond-mat.mes-hall; cond-mat.other; cond-mat.stat-mech; quant-ph
- 文献种类: Manual Script
- 期卷页: 2017年
- 日期: 2017-12-15
- 发布方式: arXiv e-prints
- 备注:http://arxiv.org/abs/1712.05588v1
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