论文标题
工作统计和热相变
Work statistics and thermal phase transitions
论文作者
论文摘要
许多先前的研究表明，工作统计数据可以在零或非常低的多体系统的量子关键系统中表现出某些奇异行为。但是，随着温度升高，通常认为这种奇异性会消失。与这种共同识别相反，我们报告了在Dicke模型以及Lipkin-Meshkov-Glick-Glick-Glick-Glick模型中进行的平均工作的非分析行为，该模型遭受了其工作参数的突然淬火。据揭示，当将淬灭参数调谐到分隔两个不同的热相的临界线上时，可以将工作统计数据视为热相变的签名。
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.
