Floquet Engineering of Gapped 2D Materials
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It is demonstrated theoretically that the interaction of gapped 2D materials (gapped graphene and transition metal dichalchogenide monolayers) with a strong high-frequency electromagnetic field (dressing field) crucially changes the band structure of the materials. As a consequence, the renormalized band structure of the materials drastically depends on the field polarization. Particularly, a linearly polarized dressing field always decreases band gaps, whereas a circularly polarized field breaks the equivalence of band valleys in different points of the Brillouin zone and can both increase and decrease corresponding band gaps. It is shown also that a dressing field can turn both the band gaps and the spin splitting of the bands into zero. As a result, the dressing field can serve as an effective tool to control spin and valley properties of the materials in various optoelectronic applications.
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- 1.P. Hanngi, in Quantum Transport and Dissipation, Ed. by T. Dittrich, P. Hanggi, G.-L. Ingold, B. Kramer, G. Schon, and W. Zwerger (Wiley, Weinheim, 1998), p. 249.Google Scholar