Sample-size effects in the magnetoresistance of graphite.
Sample-size effects in the magnetoresistance of graphite.
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DOI：
10.1103/physrevlett.99.216601
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发表时间：
2007-06
影响因子：
8.6
通讯作者：
J. C. González;M. Muñoz;N. García;J. Barzola-Quiquia;D. Spoddig;K. Schindler;P. Esquinazi
中科院分区：
文献类型：
--
作者：
J. C. González;M. Muñoz;N. García;J. Barzola-Quiquia;D. Spoddig;K. Schindler;P. Esquinazi
石墨中的导电电子具有微米级的大布罗意波长和平均自由程，这些长度对有限尺寸样品的电输运性质的直接影响过去被忽略。我们提供了一个直接的证据，这种效果通过尺寸依赖性的磁阻，这与样品的大小，即使样品数百微米大。我们的研究结果可以解释在少数石墨烯层样品中没有磁阻，并要求对这种材料的传输特性的实验和理论工作进行全面修订。
Conduction electrons in graphite are expected to have micrometer large de Broglie wavelength as well as mean free path. A direct influence of these lengths in the electric transport properties of finite-size samples was neglected in the past. We provide a direct evidence of this effect through the size dependence of the magnetoresistance, which decreases with the sample size even for samples hundreds of micrometers large. Our findings may explain the absence of magnetoresistance in small few graphene layers samples and ask for a general revision of the experimental and theoretical work on the transport properties of this material.