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arXiv 1109.0108cond-mat.stat-mechquant-ph
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有限浴下小量子系统的Specific heat反常

Specific heat anomalies of small quantum systems subjected to finite baths

Hideo Hasegawa

摘要:

研究了无耗散强耦合于$N_B$-体谐振子浴的$N_S$ -体谐振子系统的$(N_S+N_B)$模型的比热.根据热力学第三定律,$C_S(T)$的系统比热在$T \rightarrow \infty$时变为$N_S k_B$,在$T = 0$时消失。低温下计算的$C_S(T)$与$N_S$不成比例,并显示出异常的温度依赖性,强烈依赖于$N_S$、$N_B$和系统-浴耦合。特别是在非常低的(但有限的)温度下,对于强的体系-浴耦合,它可能变为{ \it负},这与G-L报道的具有$N_S=1$的HO体系的{ \it非负}比热相反。Ingold,P. Hänggi和P. Talkner [Phys. Rev. E { \bf 79},061105(2005)]。我们的计算表明,在研究一般可能包含任意数量粒子的开放量子系统时,考虑有限$N_S$的重要性。

英文摘要:

We have studied the specific heat of the $(N_S+N_B)$ model for an $N_S$-body harmonic oscillator (HO) system which is strongly coupled to an $N_B$-body HO bath without dissipation. The system specific heat of $C_S(T)$ becomes $N_S k_B$ at $T \rightarrow \infty$ and vanishes at $T = 0$ in accordance with the third law of thermodynamics. The calculated $C_S(T)$ at low temperatures is not proportional to $N_S$ and shows an anomalous temperature dependence, strongly depending on $N_S$, $N_B$ and the system-bath coupling. In particular at very low (but finite) temperatures, it may become {\it negative} for a strong system-bath coupling, which is in contrast with {\it non-negative} specific heat of an HO system with $N_S=1$ reported by G-L. Ingold, P. Hänggi and P. Talkner [Phys. Rev. E {\bf 79}, 061105 (2005)]. Our calculation indicates an importance of taking account of finite $N_S$ in studying open quantum systems which may include an arbitrary number of particles in general.

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。

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