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arXiv 0907.0655cond-mat.mes-hall
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强磁场中二维电子系统负微分电阻态的非线性输运理论

Non linear transport theory for negative-differential resistance states of two dimensional electron systems in strong magnetic fields

A. Kunold, M. Torres

摘要:

本文提出一个模型来描述强磁场中二维电子系统对直流电的非线性响应。该模型是基于冯·诺依曼方程的解决方案,将二维阻尼电子在任意强磁场和直流电场的存在下的精确动力学,而随机分布的杂质的影响扰动添加。从微分电阻率和纵向电压的分析中,我们观察到负微分电阻率状态(NDRS)的形成,这是零微分电阻率状态(ZDRS)的前兆。理论预测正确地再现的主要实验特征,提供的非弹性散射率服从$T^2$温度依赖性,与电子-电子相互作用的影响。

英文摘要:

We present a model to describe the nonlinear response to a direct dc current applied to a two-dimensional electron system in a strong magnetic field. The model is based on the solution of the von Neumann equation incorporating the exact dynamics of two-dimensional damped electrons in the presence of arbitrarily strong magnetic and dc electric fields, while the effects of randomly distributed impurities are perturbatively added. From the analysis of the differential resistivity and the longitudinal voltage we observe the formation of negative differential resistivity states (NDRS) that are the precursors of the zero differential resistivity states (ZDRS). The theoretical predictions correctly reproduce the main experimental features provided that the inelastic scattering rate obey a $T^2$ temperature dependence, consistent with electron-electron interaction effects.

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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