Quasi-energy spectra of graphene dots under intense ac field: field anisotropy and photon dressed quantum rings
arXiv:0903.3275 · doi:10.1103/PhysRevB.79.205406
Abstract
A graphene quantum dot under intense ac field and static low magnetic field is investigated. From a tight-binding perspective, applying a Fourier-Floquet transformation and renormalization process, we observe that graphene -intrinsically anisotropic- reveals field polarization signatures in the quasi-density of states. For the ac field polarized along the armchair direction, the dressed electronic structure shows an emergent property: an ac field induced quantum ring. This is inferred by the orientation-dependent formation of a miniband of energy states periodically modulated with increasing magnetic field, exactly analogous to the behavior of a quantum ring spectrum.
6 pages, 6 figures
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- Magneto-transport characteristics of a 2D electron system driven to negative magneto-conductivity by microwave photoexcitation
- Complex-band-structure eigenvalue method adapted to Floquet systems: topological superconducting wires as a case study