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arXiv 1907.04992cond-mat.mtrl-scicond-mat.mes-hall
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反谷轨道磁矩感生的负磁电阻

Valley-Contrasting Orbital Magnetic Moment Induced Negative Magnetoresistance

Hailong Zhou, Cong Xiao, Qian Niu

摘要:

布洛赫电子的谷-对比轨道磁矩允许面外磁场提升谷简并度。我们证明,这将导致负磁阻,利用一个缺口的二维多谷模型作为一个例子。一个直观的物理图片,从磁门效应的载流子密度增加提出了这种负磁阻。特别地,在两个谷中的一个被磁场耗尽之后实现巨负磁阻。这种新的负磁电阻机制被认为是相关的离子液体门控间隙小的有效质量的石墨烯。

英文摘要:

The valley-contrasting orbital magnetic moment of Bloch electrons allows the lifting of valley degeneracy by an out-of-plane magnetic field. We demonstrate that this leads to negative magnetoresistance, utilizing a gapped two-dimensional multi-valley model as an example. An intuitive physical picture in terms of the increased carrier density from a magnetic gating effect is proposed for this negative magnetoresistance. In particular, giant negative magnetoresistance is achieved after one of the two valleys is depleted by the magnetic field. This new mechanism of negative magnetoresistance is argued to be relevant in ionic-liquid gated gapped graphene with small effective mass.

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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