TY - JOUR
T1 - Voltage-driven ring confinement in a graphene sheet
T2 - Assessing conditions for bound state solutions
AU - Villegas-Lelovsky, Leonardo
AU - Trallero-Giner, Carlos
AU - Lopez-Richard, Victor
AU - Marques, Gilmar E.
AU - Villegas, Cesar E.P.
AU - Tavares, Marcos R.S.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/9/28
Y1 - 2012/9/28
N2 - We have systematically studied the single-particle states in quantum rings produced by a set of concentric circular gates over a graphene sheet placed on a substrate. The resulting potential profiles and the interaction between the graphene layer and the substrate are considered within the Dirac Hamiltonian in the framework of the envelope function approximation. Our simulations allow microscopic mapping of the character of the electron and hole quasi-particle solutions according to the applied voltage. General conditions to control and operate the bound state solutions are described as functions of external and controllable parameters that will determine the optical properties ranging from metallic to semiconductor phases. Contrasting behaviors are obtained when comparing the results for repulsive and attractive voltages as well as for variation of the relative strength of the graphene-substrate coupling parameter.
AB - We have systematically studied the single-particle states in quantum rings produced by a set of concentric circular gates over a graphene sheet placed on a substrate. The resulting potential profiles and the interaction between the graphene layer and the substrate are considered within the Dirac Hamiltonian in the framework of the envelope function approximation. Our simulations allow microscopic mapping of the character of the electron and hole quasi-particle solutions according to the applied voltage. General conditions to control and operate the bound state solutions are described as functions of external and controllable parameters that will determine the optical properties ranging from metallic to semiconductor phases. Contrasting behaviors are obtained when comparing the results for repulsive and attractive voltages as well as for variation of the relative strength of the graphene-substrate coupling parameter.
UR - http://www.scopus.com/inward/record.url?scp=84866056103&partnerID=8YFLogxK
U2 - 10.1088/0957-4484/23/38/385201
DO - 10.1088/0957-4484/23/38/385201
M3 - Artículo
C2 - 22947852
AN - SCOPUS:84866056103
SN - 0957-4484
VL - 23
JO - Nanotechnology
JF - Nanotechnology
IS - 38
M1 - 385201
ER -