Work statistics and thermal phase transitions

• URL: http://arxiv.org/abs/2206.04422v2
• Date: Wed, 7 Sep 2022 00:04:07 GMT
• Title: Work statistics and thermal phase transitions
• Authors: Ze-Zhou Zhang and Wei Wu
• Abstract summary: We report a nonanalytic behavior of the averaged work done, which occurs at finite temperature, in the Dicke model. It is revealed that work statistics can be viewed as a signature of the thermal phase transition when the quenched parameters are tuned across the critical line.
• Score: 4.8229512034776
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Many previous studies have demonstrated that work statistics can exhibit certain singular behaviors in the quantum critical regimes of many-body systems at zero or very low temperatures. However, as the temperature increases, it is commonly believed that such singularities will vanish. Contrary to this common recognition, we report a nonanalytic behavior of the averaged work done, which occurs at finite temperature, in the Dicke model as well as the Lipkin-Meshkov-Glick model subjected to the sudden quenches of their work parameters. It is revealed that work statistics can be viewed as a signature of the thermal phase transition when the quenched parameters are tuned across the critical line that separates two different thermal phases.

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