Experimental evidence for Efros-Shklovskii variable range hopping in hydrogenated graphene
Experimental evidence for Efros-Shklovskii variable range hopping in hydrogenated graphene
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DOI：
10.1016/j.ssc.2012.02.002
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发表时间：
2012-05-01
影响因子：
2.1
通讯作者：
Liang, C. -T.
中科院分区：
文献类型：
--
作者：
Chuang, Chiashain;Puddy, R. K.;Liang, C. -T.
我们对氢化石墨烯薄片进行了输运测量。研究发现，传统分析无法让我们确定 Mott 可变范围跳跃 (VRH) 还是 Efros-Shklovskii (ES) VRH 是我们系统中的主导机制。通过采用改进的电阻曲线导数分析（RCDA）方法，我们能够明确地表明 ES VRH 占主导地位，因此我们的系统在零磁场下存在库仑相互作用效应。在中场和高场状态下获得的传输数据也遵循基于 RCDA 方法的 ES VRH。我们的结果表明库仑相互作用效应可以在无序石墨烯中发挥重要作用。 (C) 2012 Elsevier Ltd. 保留所有权利。
We have performed transport measurements on a hydrogenated graphene flake. It is found that conventional analysis cannot allow us to determine whether Mott variable range hopping (VRH) or Efros-Shklovskii (ES) VRH is the dominant mechanism in our system. By employing the modified resistance curve derivative analysis (RCDA) method, we are able to unequivocally show that ES VRH dominates and thus Coulomb interaction effects exist in our system at zero magnetic field. Transport data obtained in the intermediate and high field regimes also follow ES VRH based on the RCDA method. Our results suggest that Coulomb interaction effects can play an important role in disordered graphene. (C) 2012 Elsevier Ltd. All rights reserved.