arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.11556quant-phcond-mat.other
收藏

超强耦合轻物质系统热力学

Thermodynamics of ultrastrongly coupled light-matter systems

Philipp Pilar, Daniele De Bernardis, Peter Rabl

摘要:

我们研究了一个两能级偶极系统的热力学性质,该系统与单腔模超强耦合。通过使用精确的数值和近似的分析方法,我们评估该系统的自由能在任意的相互作用强度和讨论强耦合修改的衍生量,如比热或电极化率。从这个分析中,我们确定了最低阶腔诱导的集体超强耦合制度中的这些量的修正,并表明,即使是更强的相互作用的存在下,一个单一的腔模式可以强烈修改广泛的热力学量的一个大的偶极子合奏。在这种非微扰耦合制度,我们也观察到一个显着的移动的铁电相变温度和特征的空腔模式的黑体光谱的加宽和崩溃。除了纯粹的基本兴趣之外,这些一般性的见解对于确定超强耦合效应的潜在应用也很重要,例如在量子化学领域或实现量子热机。

英文摘要:

We study the thermodynamic properties of a system of two-level dipoles that are coupled ultrastrongly to a single cavity mode. By using exact numerical and approximate analytical methods, we evaluate the free energy of this system at arbitrary interaction strengths and discuss strong-coupling modifications of derivative quantities such as the specific heat or the electric susceptibility. From this analysis we identify the lowest-order cavity-induced corrections to those quantities in the collective ultrastrong coupling regime and show that for even stronger interactions the presence of a single cavity mode can strongly modify extensive thermodynamic quantities of a large ensemble of dipoles. In this non-perturbative coupling regime we also observe a significant shift of the ferroelectric phase transition temperature and a characteristic broadening and collapse of the black-body spectrum of the cavity mode. Apart from a purely fundamental interest, these general insights will be important for identifying potential applications of ultrastrong-coupling effects, for example, in the field of quantum chemistry or for realizing quantum thermal machines.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑