TY - JOUR
T1 - Renormalization approach to quantum-dot structures under strong alternating fields
AU - Schulz, P. A.
AU - Rivera Riofano, Pablo Hector
AU - Studart, Nelson
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2002
Y1 - 2002
N2 - We develop a renormalization method for the quasienergy spectra of low-dimensional structured systems under intense ac fields. These systems are emulated by tight-binding lattice models with a clear continuum limit of the effective-mass and single-particle approximations. The coupling to the ac field is treated nonperturbatively by means of the Floquet Hamiltonian. The renormalization approach gives an intuitive view of the electronic dressed states. The numerical advantage over a direct diagonalization of the Floquet Hamiltonian makes the method suitable for the study of dressed states of nanoscopic systems with realistic geometries, irrespective of the ac field intensity. Two numerical examples are discussed: a quantum dot, emphasizing the analysis of the effective-mass limit for lattice models and double-dot structures, for which we discuss the limit of the two-level approximation currently used in the literature.
AB - We develop a renormalization method for the quasienergy spectra of low-dimensional structured systems under intense ac fields. These systems are emulated by tight-binding lattice models with a clear continuum limit of the effective-mass and single-particle approximations. The coupling to the ac field is treated nonperturbatively by means of the Floquet Hamiltonian. The renormalization approach gives an intuitive view of the electronic dressed states. The numerical advantage over a direct diagonalization of the Floquet Hamiltonian makes the method suitable for the study of dressed states of nanoscopic systems with realistic geometries, irrespective of the ac field intensity. Two numerical examples are discussed: a quantum dot, emphasizing the analysis of the effective-mass limit for lattice models and double-dot structures, for which we discuss the limit of the two-level approximation currently used in the literature.
UR - http://www.scopus.com/inward/record.url?scp=85038338721&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.66.195310
DO - 10.1103/PhysRevB.66.195310
M3 - Artículo
AN - SCOPUS:85038338721
VL - 66
SP - 1
EP - 9
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 19
ER -