Optical and photogalvanic properties of graphene supperlattices formed by periodic strain

Abstract

Graphene superlattices formed by periodic strain are considered theoretically. It is shown that electron energy spectrum consists of minibands obtained by folding of the cone at the boundaries of the superlattice Brillouin zone with very narrow anticrossing regions. Light absorption under direct interminiband transitions is shown to be frequency dependent and dichroic. Giant dichroism of absorption is demonstrated for doped graphene superlattices. Asymmetrical graphene superlattices act as quantum ratchets allowing for generation of photocurrent at absorption of normally incident light. The helicity-dependent photocurrent spectrum is calculated for doped superlattices with various asymmetries.

6 pages, 4 figures

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• Highly superlinear photogalvanic effects in (Bi${}_{0.3}$Sb${}_{0.7}$)${}_2$(Te${}_{0.1}$Se${}_{0.9}$)${}_3$: Probing 3D topological insulator surface states at room temperature
• Beatings of ratchet current magneto-oscillations in GaN-based grating gate structures: manifestation of spin-orbit band splitting
• Giant ratchet magneto-photocurrent in graphene lateral superlattices
• Proposal for Plasmon Spectroscopy of Fluctuations in Low-Dimensional Superconductors
• Terahertz ratchet in graphene 2D metamaterial formed by a patterned gate with an antidot arrayd
• Quantum transport in a driven disordered potential: onset of directed current and noise-induced current reversal
• Circular THz ratchets in a 2D-modulated Dirac system
• Designer gapped and tilted Dirac cones in lateral graphene superlattices