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
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2010 p. 125207 - 125217
ISSN:
1098-0121
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.