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arXiv 1108.2146cond-mat.mes-hall
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石墨烯纳米带高场输运中漂移速度峰和负微分迁移率的数值模拟解释

Drift velocity peak and negative differential mobility in high field transport in graphene nanoribbons explained by numerical simulations

Alessandro Betti, Gianluca Fiori, Giuseppe Iannaccone

摘要:

我们提出了高场输运的数值模拟悬浮和沉积扶手椅型石墨烯纳米粒子(A-GNR)在HfO 2衬底。悬浮GNR中的漂移速度在高电场(F)下不饱和,而是降低,在F=10 kV/cm时显示出最大值。沉积在HfO 2强烈降低漂移速度的因素高达10相对于悬浮GNRs在低场制度,而在高场漂移速度接近内在的价值,预计在悬浮GNRs。即使在完美边缘的假设下,所获得的迁移率也远远落后于二维石墨烯的预期,并且被表面光学声子进一步降低。

英文摘要:

We present numerical simulations of high field transport in both suspended and deposited armchair graphene nanoribbon (A-GNR) on HfO2 substrate. Drift velocity in suspended GNR does not saturate at high electric field (F), but rather decreases, showing a maximum for F=10 kV/cm. Deposition on HfO2 strongly degrades the drift velocity by up to a factor of 10 with respect to suspended GNRs in the low-field regime, whereas at high fields drift velocity approaches the intrinsic value expected in suspended GNRs. Even in the assumption of perfect edges, the obtained mobility is far behind what expected in two-dimensional graphene, and is further reduced by surface optical phonons.

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