Volume 80, Number 1, October 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 September 2007|
Transport and correlated fluctuations in the nonlinear optical response of excitons
Chemistry Department, University of California Irvine - 1102 Natural Sciences 2, Irvine, CA 92697-2025, USA
2 Theoretical Physics Department, Faculty of Physics of Vilnius University - Sauletekio ave. 9, bld. 3, Vilnius, LT 10222, Lithuania
3 Institute of Physics - Savanoriu 231, Vilnius, LT 02300, Lithuania
Accepted: 13 August 2007
Closed expressions are derived for the femtosecond four-wave mixing of excitons which include slow Gaussian diagonal fluctuations (spectral diffusion) through the cumulant expansion and incoherent exciton transport induced by fast Markovian fluctuations. The interplay of both processes in the two-dimensional photon echo is demonstrated using model calculations for a dimer.
PACS: 78.47.+p – Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter / 82.53.Kp – Coherent spectroscopy of atoms and molecules / 33.70.Jg – Line and band widhs, shapes, and shifts
© Europhysics Letters Association, 2007
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