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arXiv 1107.5352cond-mat.mes-hall
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p-i-n型石墨烯纳米带间隧穿效应导致的室温高磁电阻效应

High magnetoresistance at room temperature in p-i-n graphene nanoribbons due to band-to-band tunneling effects

Gengchiau Liang, S. Bala kumar, M. B. A. Jalil, S. G. Tan

摘要:

利用p-i-n扶手椅-石墨烯-纳米晶(GNR)异质结在室温下获得了很大的磁电阻效应。主要优点是由于接触中存在带隙而实际上消除了热流。由于带间隧穿效应,B= 0 T时的电流大大降低,而B> 0 T时的电流相对较大,导致即使在室温下也具有高的磁阻比。此外,我们探讨的边缘粗糙度,长度和宽度的GNR通道上的器件性能的影响。边缘粗糙度和沟道长度的增加提高了磁阻比,而沟道宽度的增加可以降低工作偏压。

英文摘要:

A large magnetoresistance effect is obtained at room-temperature by using p-i-n armchair-graphene-nanoribbon (GNR) heterostructures. The key advantage is the virtual elimination of thermal currents due to the presence of band gaps in the contacts. The current at B=0T is greatly decreased while the current at B>0T is relatively large due to the band-to-band tunneling effects, resulting in a high magnetoresistance ratio, even at room-temperature. Moreover, we explore the effects of edge-roughness, length, and width of GNR channels on device performance. An increase in edge-roughness and channel length enhances the magnetoresistance ratio while increased channel width can reduce the operating bias.

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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