TY - JOUR
T1 - Impurity-related intraband absorption in coupled quantum dot-ring structure under lateral electric field
AU - Barseghyan, M. G.
AU - Baghramyan, H. M.
AU - Laroze, D.
AU - Bragard, J.
AU - Kirakosyan, A. A.
N1 - Publisher Copyright:
© 2015 Elsevier B.V. Allrightsreserved.
PY - 2015/8/12
Y1 - 2015/8/12
N2 - The effects of a lateral electric field on intraband absorption in GaAs/GaAlAs two-dimensional coupled quantum dot-ring structure with an on-center hydrogenic donor impurity are investigated. The confining potential of the system consists of two parabolas with various confinement energies. The calculations are made using the exact diagonalization technique. A selection rule for intraband transitions was found for x-polarized incident light. The absorption spectrum mainly exhibits a redshift with the increment of electric field strength. On the other hand, the absorption spectrum can exhibit either a blue- or redshift depending on the values of confinement energies of dot and ring. Additionally, electric field changes the energetic shift direction influenced by the variation of barrier thickness of the structure.
AB - The effects of a lateral electric field on intraband absorption in GaAs/GaAlAs two-dimensional coupled quantum dot-ring structure with an on-center hydrogenic donor impurity are investigated. The confining potential of the system consists of two parabolas with various confinement energies. The calculations are made using the exact diagonalization technique. A selection rule for intraband transitions was found for x-polarized incident light. The absorption spectrum mainly exhibits a redshift with the increment of electric field strength. On the other hand, the absorption spectrum can exhibit either a blue- or redshift depending on the values of confinement energies of dot and ring. Additionally, electric field changes the energetic shift direction influenced by the variation of barrier thickness of the structure.
KW - Coupled quantum dot-ring
KW - Exact diagonalization method
KW - Hydrogenic donor impurity
KW - Lateral electric field
UR - https://www.scopus.com/pages/publications/84938868868
U2 - 10.1016/j.physe.2015.07.032
DO - 10.1016/j.physe.2015.07.032
M3 - Article
AN - SCOPUS:84938868868
SN - 1386-9477
VL - 74
SP - 421
EP - 425
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
ER -