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(seminar)Dynamical quantum phase transitions in non-Hermitian lattices
- Title (seminar)Dynamical quantum phase transitions in non-Hermitian lattices
- Speaker
- Date
- Venue
CAS Key Laboratory of Theoretical Physics | |
Institute of Theoretical Physics | |
Chinese Academy of Sciences | |
Seminar | |
Title 题目 | Dynamical quantum phase transitions in non-Hermitian lattices |
Speaker 报告人 | Dr. Zhou Longwen |
Affiliation 所在单位 | Department of physics, National University of Singapore |
Date 日期 | 2017年12月29日(周五)下午2:00 |
Venue 地点 | 新楼6420 |
Abstract 摘要 | In closed quantum systems, a dynamical phase transition is identified by nonanalytic behaviors of the return probability as a function of time. In this work, we study the nonunitary dynamics following quenches across exceptional points in a non-Hermitian lattice realizable by optical resonators. Dynamical quantum phase transitions with topological signatures are found when an isolated exceptional point is crossed during the quench. A winding number defined by a real, noncyclic geometric phase is introduced, whose value features quantized jumps at critical times of these phase transitions and remains constant elsewhere, playing the role of a topological order parameter. This work provides a simple framework to study dynamical and topological quantum phase transitions in non-Hermitian systems. Ref: arXiv:1711.10741 |
Contact person 所内联系人 | 田矗舜 |