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Interaction of ultrafast optical pulse with monolayer hexagonal Boron Nitride (h-BN)
Physica E: Low-dimensional Systems and Nanostructures ( IF 3.3 ) Pub Date : 2021-07-22 , DOI: 10.1016/j.physe.2021.114906
Prabath Hewageegana 1
Affiliation  

We theoretically study the interaction of an ultrafast intense circularly polarized optical pulse with monolayer hexagonal Boron Nitride (h-BN). Such a strong pulse redistributes electrons between the bands and generates a valley-selective conduction band population. The mechanism of producing fundamentally fastest valley polarization in this monolayer has a topological origin. For the moderately large values of pulse duration, both the valley polarization and the residual conduction band population decrease and vanish after a certain value of a pulse duration creating a whole new interference pattern in the reciprocal space. The ultrafast valley polarization in monolayer h-BN may provide a fundamental basis for petahertz-band information processing.



中文翻译:

超快光脉冲与单层六方氮化硼 (h-BN) 的相互作用

我们从理论上研究了超快强圆偏振光脉冲与单层六方氮化硼 ( h- BN) 的相互作用。如此强的脉冲在带之间重新分布电子并产生谷选择性导带群。在该单层中产生从根本上最快的谷极化的机制具有拓扑起源。对于中等大的脉冲持续时间值,在脉冲持续时间的某个值之后,谷极化和残余导带种群都减少并消失,从而在倒易空间中产生全新的干涉图样。单层h- BN 中的超快谷极化可为太赫兹波段信息处理提供基础。

更新日期:2021-07-28
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