IFIBA   22255
INSTITUTO DE FISICA DE BUENOS AIRES
Unidad Ejecutora - UE
artículos
Título:
Twisted-light-induced optical transitions in semiconductors: Free-carrier quantum kinetics
Autor/es:
G. F. QUINTEIRO; P. I. TAMBORENEA
Revista:
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS
Editorial:
American Physical Society
Referencias:
Año: 2010 vol. 82 p. 125207 - 125216
ISSN:
0163-1829
Resumen:
We theoretically investigate the interband transitions and quantum
kinetics induced by light carrying orbital angular momentum, or twisted
light, in bulk semiconductors. We pose the problem in terms of the
Heisenberg equations of motion of the electron populations, and
interband and intraband coherences. Our theory extends the free-carrier
semiconductor Bloch equations to the case of photoexcitation by
twisted light. The theory is formulated using cylindrical coordinates,
which are better suited to describe the interaction with twisted
light than the usual Cartesian coordinates used to study regular
optical excitation. We solve the equations of motion in the low
excitation regime, and obtain analytical expressions for the
coherences and populations; with these, we calculate the orbital
angular momentum transferred from the light to the electrons and the
paramagnetic and diamagnetic electric current densities.