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arXiv 1102.1828cond-mat.mes-hall
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纳米机电系统的相干特性

Coherent properties of nano-electromechanical systems

G. Piovano, F. Cavaliere, E. Paladino, M. Sassetti

摘要:

我们研究了纳米机电系统的相干制度,其中电子和振动的时间尺度是相同的顺序的属性。采用主方程方法,我们得到了保持振动态间相干性的稳态约化密度矩阵。根据系统的参数,两个制度被确定,其特征在于由($i$)的{ \em有效}的热状态与温度{ \em低于}的环境或($ii$)强相干效应。一个显着的冷却的振动自由度的观察与抑制的振子Fano因子下降到亚泊松值和减少的位置和动量求积。

英文摘要:

We study the properties of a nano-electromechanical system in the coherent regime, where the electronic and vibrational time scales are of the same order. Employing a master equation approach, we obtain the stationary reduced density matrix retaining the coherences between vibrational states. Depending on the system parameters, two regimes are identified, characterized by either ($i$) an {\em effective} thermal state with a temperature {\em lower} than that of the environment or ($ii$) strong coherent effects. A marked cooling of the vibrational degree of freedom is observed with a suppression of the vibron Fano factor down to sub-Poissonian values and a reduction of the position and momentum quadratures.

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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