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arXiv 2409.07282cond-mat.mes-hallcond-mat.mtrl-sciphysics.comp-phquant-ph
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[110]和[100]硅纳米线中的低温电子输运:DFT-蒙特卡罗研究

Low-Temperature Electron Transport in [110] and [100] Silicon Nanowires: A DFT - Monte Carlo study

Daryoush Shiri, Reza Nekovei, Amit Verma

AI总结:

本文通过DFT与系综蒙特卡罗方法结合,研究[110]和[100]硅纳米线在低温下的电子输运,发现低温使漂移速度至少提升2倍,且[110]方向比[100]方向高50%,源于子带有效质量差异和散射率降低。

摘要:

研究了极低温度对[110]和[100]轴向排列的无应变硅纳米线(SiNWs)中电子输运的影响。采用半经验10轨道紧束缚方法、密度泛函理论(DFT)和系综蒙特卡罗(EMC)方法相结合的方式进行研究。在电子-声子散射率计算中同时包含了声学声子和光学声子,覆盖了子带内和子带间事件。与室温(300 K)特性的比较表明,对于两种纳米线,在相对中等电场和较低温度下,平均电子稳态漂移速度至少提高2倍。此外,[110]纳米线中的平均漂移速度比[100]纳米线高50%,这可以用它们导带子带有效质量的差异来解释。瞬态平均电子速度表明,在低温下存在显著的电子流运动,这归因于电子-声子散射率的降低。

英文摘要:

The effects of very low temperature on the electron transport in a [110] and [100] axially aligned unstrained silicon nanowires (SiNWs) are investigated. A combination of semi-empirical 10-orbital tight-binding method, density functional theory (DFT), and Ensemble Monte Carlo (EMC) methods are used. Both acoustic and optical phonons are included in the electron-phonon scattering rate calculations covering both intra-subband and inter-subband events. A comparison with room temperature (300 K) characteristics shows that for both nanowires, the average electron steady-state drift velocity increases at least 2 times at relatively moderate electric fields and lower temperatures. Furthermore, the average drift velocity in [110] nanowires is 50 percent more than that of [100] nanowires, explained by the difference in their conduction subband effective mass. Transient average electron velocity suggests that there is a pronounced streaming electron motion at low temperature which is attributed to the reduced electron-phonon scattering rates.

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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