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arXiv 1607.05941cond-mat.mtrl-scicond-mat.mes-hall
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光致Floquet Weyl半金属相理论

Theory of photoinduced Floquet Weyl semimetal phases

Xiao-Xiao Zhang, Tze Tzen Ong, Naoto Nagaosa

摘要:

由于外尔点,外尔半金属表现出各种有趣的物理现象,即,线性带交叉我们用Floquet理论证明了线偏振光作用于带状绝缘体上可以诱导出可控的外尔点。在紧束缚模型中,我们对不同类型的光致外尔点进行分类,这些外尔点导致了丰富的相图,其特征在于在体态的每个动量切片上定义的陈数。考虑到电子的非平衡分布,我们用光频控制外尔点位置的移动来计算和解释非单调的反常霍尔电导率,并考察电导率对驱动电场的依赖性.

英文摘要:

The Weyl semimetal exhibits various interesting physical phenomena because of the Weyl points, i.e., linear band-crossings. We show by Floquet theory that a linearly polarized light applied to a band insulator can induce controllable Weyl points. In a tight-binding model, we classify different types of photoinduced Weyl points that lead to a rich phase diagram characterized by the Chern number defined on each momentum slices of the bulk states. Taking account of the nonequilibrium electron distribution, we calculate and explain the nonmonotonous anomalous Hall conductivity in terms of the light frequency controlled shift of Weyl points' position, which also allows us to examine the conductivity's dependence on the driving electric field.

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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