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Type: Artigo de periódico
Title: Quasienergy spectra of graphene dots in intense ac fields: Field anisotropy and photon-dressed quantum rings
Author: Rivera, PH
Pereira, ALC
Schulz, PA
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 quasidensity 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.
Subject: band structure
dressed states
electronic density of states
quantum dots
tight-binding calculations
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.79.205406
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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