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arXiv 0709.3610cond-mat.mes-hallcond-mat.mtrl-sci
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分子结输运中的非弹性效应:Seebeck系数的散射和自洽计算

Inelastic effects in molecular junction transport: Scattering and self-consistent calculations for the Seebeck coefficient

Michael Galperin, Abraham Nitzan, Mark A. Ratner

摘要:

在一个简单的模型内研究了分子振动对Seebeck系数的影响。一个散射理论的方法的结果进行了比较,一个完整的自洽非平衡格林函数计划。我们表明,对于一个合理的参数选择,非弹性效应产生的塞贝克系数的结有不可忽略的影响。我们注意到,散射理论的方法可能会失败定量和定性。合理参数的计算结果与最近的测量结果吻合良好[P.Reddy等人,Science 315,1568(2007)]

英文摘要:

The influence of molecular vibration on the Seebeck coefficient is studied within a simple model. Results of a scattering theory approach are compared to those of a full self-consistent non-equilibrium Green's function scheme. We show, for a reasonable choice of parameters, that inelastic effects have non-negligible influence on the resulting Seebeck coefficient for the junction. We note that the scattering theory approach may fail both quantitatively and qualitatively. Results of calculation with reasonable parameters are in good agreement with recent measurements [P. Reddy et al., Science 315, 1568 (2007)]

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