Showing 1–1 of 1 results for author: Choi, S B

Electric field-induced quantum interference control in a semiconductor: A new manifestation of the Franz-Keldysh effect

Authors: J. K. Wahlstrand, H. Zhang, S. B. Choi, S. Kannan, D. S. Dessau, J. E. Sipe, S. T. Cundiff

Abstract: In (100)-oriented GaAs illuminated at normal incidence by a laser and its second harmonic, interference between one- and two-photon absorption results in ballistic current injection, but not modulation of the overall carrier injection rate. Results from a pump-probe experiment on a transversely biased sample show that a constant electric field enables coherent control of the carrier injection rate… ▽ More In (100)-oriented GaAs illuminated at normal incidence by a laser and its second harmonic, interference between one- and two-photon absorption results in ballistic current injection, but not modulation of the overall carrier injection rate. Results from a pump-probe experiment on a transversely biased sample show that a constant electric field enables coherent control of the carrier injection rate. We ascribe this to the nonlinear optical Franz-Keldysh effect and calculate it for a two-band parabolic model. The mechanism is relevant to centrosymmetric semiconductors as well. △ Less

Submitted 29 March, 2011; v1 submitted 11 August, 2010; originally announced August 2010.

Comments: 4 pages, 2 figures. New data, less theory