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Dirac fermions in asymmetric graphene in electromagnetic field
Optical and Quantum Electronics ( IF 3 ) Pub Date : 2020-06-01 , DOI: 10.1007/s11082-020-02374-w
Km Arti Mishra , Vipin Kumar

It is well-known that the asymmetry has dramatic effects on the properties of graphene. Therefore, here, a systematic study is presented to describe the effect of asymmetry on the Floquet oscillations in graphene. Even in the absence of external electromagnetic field, some kind of oscillations is predicted due to asymmetry. In pump-probe spectra, it is found that the amplitude of Floquet oscillations decreases in the presence of asymmetry in the graphene, however, the frequency of these oscillations increases. Moreover, the collapse and revival times are affected significantly due to asymmetry in graphene. The Bloch–Siegert shift is studied in the perspective of Floquet oscillation, called Floquet–Bloch–Siegert shift. A numerical simulation is performed to justify the role of asymmetry on Floquet oscillation in graphene.

中文翻译:

电磁场中不对称石墨烯中的狄拉克费米子

众所周知,不对称性对石墨烯的性质有显着影响。因此,这里提出了一项系统研究来描述不对称性对石墨烯中 Floquet 振荡的影响。即使在没有外部电磁场的情况下,也会由于不对称性而预测出某种振荡。在泵浦探针光谱中,发现在石墨烯中存在不对称性时 Floquet 振荡的幅度会降低,但是,这些振荡的频率会增加。此外,由于石墨烯的不对称性,坍塌和恢复时间受到显着影响。Bloch-Siegert 位移是从 Floquet 振荡的角度研究的,称为 Floquet-Bloch-Siegert 位移。进行数值模拟以证明不对称性对石墨烯中 Floquet 振荡的作用。
更新日期:2020-06-01
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