arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.12757cond-mat.mes-hallcond-mat.other
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带隙石墨烯中的反常超快全光霍尔效应

Anomalous Ultrafast All-Optical Hall Effect in Gapped Graphene

S. Azar Oliaei Motlagh, Vadym Apalkov, Mark I. Stockman

摘要:

我们提出了一个超快全光学反常霍尔效应在二维(2D)的六方对称的半导体,如带隙石墨烯(GG),过渡金属二硫属化物(TMDC),和六方氮化硼(h-BN)。为了诱导这种效应,材料受到两个强场单光周期脉冲序列的作用:一个手征泵浦脉冲,随后在几个飞秒内跟随一个在2D晶格的扶手椅方向线性极化的探测脉冲。由于拓扑共振效应,第一个(泵浦)脉冲在系统中诱导了大的手征性(谷极化),而第二个脉冲产生了异常霍尔电流的飞秒脉冲。该效应是自然界中最快的全光学反常霍尔效应。它可以应用于超快全光存储和信息处理,包括经典和量子。

英文摘要:

We propose an ultrafast all-optical anomalous Hall effect in two-dimensional (2D) semiconductors of hexagonal symmetry such as gapped graphene (GG), transition metal dichalcogenides (TMDCs), and hexagonal boron nitride (h-BN). To induce such an effect, the material is subjected to a sequence of two strong-field single-optical-cycle pulses: a chiral pump pulse followed within a few femtoseconds by a probe pulse linearly polarized in the armchair direction of the 2D lattice. Due to the effect of topological resonance, the first (pump) pulse induces a large chirality (valley polarization) in the system, while the second pulse generates a femtosecond pulse of the anomalous Hall current. The proposed effect is the fundamentally the fastest all-optical anomalous Hall effect possible in nature. It can be applied to ultrafast all-optical storage and processing of information, both classical and quantum.

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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