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arXiv 1704.04076cond-mat.str-el
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从热力学看准粒子的有效质量

Effective mass of quasiparticles from thermodynamics

F. G. Eich, Markus Holzmann, G. Vignale

摘要:

本文讨论了由低温自由能计算相互作用电子液体中准粒子有效质量的潜在优点,并与传统的由自能近似计算或由变分“准粒子波函数“能量的量子Monte Carlo估计得到有效质量的方法进行了比较.虽然原始的量子蒙特卡罗数据目前太稀疏,无法准确确定有效质量,但通过这种方法估计的值在数值上接近以前使用图解多体理论计算得到的值。与此相反,最近发表的参数化的量子蒙特卡罗数据的均匀电子液体的自由能产生的有效质量,大大偏离以前的计算,甚至改变低密度的符号,反映了一个非物理的负熵。我们认为这种反常现象与有限温度下交换能的处理有关。

英文摘要:

We discuss the potential advantages of calculating the effective mass of quasiparticles in the interacting electron liquid from the low-temperature free energy vis-a-vis the conventional approach, in which the effective mass is obtained from approximate calculations of the self-energy, or from a quantum Monte Carlo evaluation of the energy of a variational "quasiparticle wave function". While raw quantum Monte Carlo data are presently too sparse to allow for an accurate determination of the effective mass, the values estimated by this method are numerically close to the ones obtained in previous calculations using diagrammatic many-body theory. In contrast to this, a recently published parametrization of quantum Monte Carlo data for the free energy of the homogeneous electron liquid yields effective masses that considerably deviate from previous calculations and even change sign for low densities, reflecting an unphysical negative entropy. We suggest that this anomaly is related to the treatment of the exchange energy at finite temperature.

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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