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arXiv 1208.3872cond-mat.str-el
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二维洁净金属中的反常态密度涨落

Anomalous Density-of-States Fluctuations in Two-Dimensional Clean Metals

T. R. Kirkpatrick, D. Belitz

摘要:

结果表明,由于Goldstone模的存在和伴随的强涨落,费米液体中的态密度涨落(可解释为序参量磁化率χ OP)异常强烈.在具有长程库仑相互作用的二维系统中,适当定义的χ_OP在小波数和频率的极限下作为温度的函数发散为1/T^2。相反,标准统计学表明χ_OP = O(T),即T的三次幂的差异。这个令人惊讶的预测背后的原因,以及如何观察它,进行了讨论。

英文摘要:

It is shown that density-of-states fluctuations, which can be interpreted as the order-parameter susceptibility χ_OP in a Fermi liquid, are anomalously strong as a result of the existence of Goldstone modes and associated strong fluctuations. In a 2-d system with a long-range Coulomb interaction, a suitably defined χ_OP diverges as 1/T^2 as a function of temperature in the limit of small wavenumber and frequency. In contrast, standard statistics suggest χ_OP = O(T), a discrepancy of three powers of T. The reasons behind this surprising prediction, as well as ways to observe it, are discussed.

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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