Nonlinear THz response of a one-dimensional superlattice

Citation
Aw. Ghosh et Jw. Wilkins, Nonlinear THz response of a one-dimensional superlattice, PHYS REV B, 61(8), 2000, pp. 5423-5430
Citations number
37
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
1098-0121 → ACNP
Volume
61
Issue
8
Year of publication
2000
Pages
5423 - 5430
Database
ISI
SICI code
1098-0121(20000215)61:8<5423:NTROAO>2.0.ZU;2-J
Abstract
The dynamics of an electron in a one-dimensional superlattice is investigat ed under the action of a THz electric field. The density matrix equations o f motion within a single miniband are solved using a relaxation-time approx imation for scattering. The electronic response to THz radiation is obtaine d by calculating the dipole moment, whence we compute the power dissipated, the THz reflection coefficieiit and dipole radiation. Collisions are essen tial in eliminating transients and bringing the electron in phase with the field at dynamic localization. The optical properties of the superlattice b ear strong signatures of dynamic electron localization such as oscillations with varying field strengths. In addition, the response is multivalued in the incident field owing to the nonlinear relation between the incident and internal fields of the superlattice, The optical properties are robust wit h respect to the inclusion of higher harmonics, weak collisions, and deviat ions;from a tight-binding miniband dispersion.