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arXiv 0801.3720cond-mat.str-el
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石墨烯中狄拉克费米子的弱局域化

Weak Localization of Dirac Fermions in Graphene

Xin-Zhong Yan, C. S. Ting

摘要:

在带电杂质存在的情况下,我们通过计算Dirac费米子在石墨烯中的电导率的量子干涉修正(QIC)来研究弱局域化(WL)效应。利用我们以前工作中得到的电子-电子相互作用引起的非弹性散射率,我们研究了QIC与载流子浓度、温度、磁场和样品尺寸的关系。结果表明,在有限载流子掺杂下,大尺寸样品中存在WL。当样品尺寸小于几微米时,在低温下,其强度变弱/淬火,如在实验中所研究的。在接近零掺杂的区域中,系统可能变得离域。实验样品尺寸的低温下的最小电导率被发现是接近的数据。

英文摘要:

In the presence of the charged impurities, we study the weak localization (WL) effect by evaluating the quantum interference correction (QIC) to the conductivity of Dirac fermions in graphene. With the inelastic scattering rate due to electron-electron interactions obtained from our previous work, we investigate the dependence of QIC on the carrier concentration, the temperature, the magnetic field and the size of the sample. It is found that WL is present in large size samples at finite carrier doping. Its strength becomes weakened/quenched when the sample size is less than a few microns at low temperatures as studied in the experiments. In the region close to zero doping, the system may become delocalized. The minimum conductivity at low temperature for experimental sample sizes is found to be close to the data.

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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