Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.185701
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Funding
- Hong Kong Research Grants Council/General Research Fund [CUHK402410]
- Chinese University of Hong Kong Focused Investments Scheme
- Hong Kong Research Grants Council/Collaborative Research Fund [HKU8/CRF/11G]
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Phase transitions are not usually seen in the time domain. Here, we report on the finding of critical times at which a physical observable, in the thermodynamic limit, becomes nonanalytic as a function of time. We find that the coherence of a probe spin coupled to a many-body system vanishes at times in one-to-one correspondence to the Lee-Yang zeros of the partition function of the many-body system. In the thermodynamic limit, the Lee-Yang zeros form a continuum cut in the complex plane of fugacity and the probe spin coherence presents sudden death and birth at the critical times corresponding to the Yang-Lee singularities. These results provide new experimental possibilities in many-body physics.
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