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arXiv 0905.3202cond-mat.stat-mechcond-mat.other
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振子链的连续谱热流和晶格热流

Continuum and lattice heat currents for oscillator chains

Onuttom Narayan, A. P. Young

摘要:

我们表明,两种常用的定义的热流给出不同的结果-通过久保公式-的振荡器链的热导率。这种差异存在于有限链中,并且预计对小结构更普遍地重要。对于一个两端被束缚的N个粒子的链,用两个电流计算的热导率之比与1相差O(1/N)。对于保持在恒定压力下的链,与1的差衰减得更慢,并且与O(1/N^eta)一致,其中1 > eta > 0.5。

英文摘要:

We show that two commonly used definitions for the heat current give different results--through the Kubo formula--for the heat conductivity of oscillator chains. The difference exists for finite chains, and is expected to be important more generally for small structures. For a chain of N particles that are tethered at the ends, the ratio of the heat conductivities calculated with the two currents differs from unity by O(1/N). For a chain held at constant pressure, the difference from unity decays more slowly, and is consistent with O(1/N^eta) with 1 > eta > 0.5.

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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