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Matrix perturbation theory for driven three‐level systems with damping
Author(s) -
Sanchez B.N.,
Brandes T.
Publication year - 2004
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.200410092
Subject(s) - polarity (international relations) , epitaxy , condensed matter physics , materials science , tilt (camera) , biasing , voltage , grain boundary , polarity reversal , current (fluid) , physics , mathematics , nanotechnology , geometry , microstructure , chemistry , composite material , quantum mechanics , thermodynamics , biochemistry , layer (electronics) , cell
We investigate the dynamics of the Λ system driven by two resonant laser fields in presence of dissipation for coupling strengths where the rotating‐wave approximation starts to break down. This regime is characterised by Rabi frequencies being approximately equal or smaller than the field frequencies. A systematic procedure to obtain an expansion for the solution of the Bloch evolution equations of the system is presented. The lowest contribution results to be the well‐known rotating‐wave approximation. The method is based on a semi‐classical treatment of the problem, and its predictions are interpreted fully quantum mechanically. The theory is illustrated by a detailed study of the disappearance of coherent population trapping as the intensities of the fields increase.