Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Power dependence of the photocurrent lineshape in a semiconductor quantum dot
AU - Russell, A.
AU - Falko, Vladimir
N1 - Copyright 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 91, 193107 (2007) and may be found at http://link.aip.org/link/?APPLAB/91/193107/1
PY - 2007/11/5
Y1 - 2007/11/5
N2 - We propose a kinetic theory to describe the power dependence of the photocurrent lineshape in optically pumped quantum dots at low temperatures in both zero and finite magnetic fields. We show that there is a crossover power P-c, determined by the electron and hole tunneling rates, where the photocurrent no longer reflects the exciton lifetime. For P > P-c, we show that the photocurrent saturates due to the slow hole escape rate, whereas the linewidth increases with power. We analyze the spin-doublet lineshape in high magnetic fields and determine to what measure it reflects the degree of circular polarization of incident light.
AB - We propose a kinetic theory to describe the power dependence of the photocurrent lineshape in optically pumped quantum dots at low temperatures in both zero and finite magnetic fields. We show that there is a crossover power P-c, determined by the electron and hole tunneling rates, where the photocurrent no longer reflects the exciton lifetime. For P > P-c, we show that the photocurrent saturates due to the slow hole escape rate, whereas the linewidth increases with power. We analyze the spin-doublet lineshape in high magnetic fields and determine to what measure it reflects the degree of circular polarization of incident light.
KW - optical pumping
KW - photoconductivity
KW - photoemission
KW - polarisation
KW - semiconductor quantum dots
KW - tunnelling
U2 - 10.1063/1.2803850
DO - 10.1063/1.2803850
M3 - Journal article
VL - 91
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 1077-3118
IS - 19
M1 - 193107
ER -