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Free keywords:
Quantum Physics, quant-ph
MPINP:
Research group J. Evers – Division C. H. Keitel
Abstract:
Bare-state population inversion is demonstrated in a two-level system with
all dipole matrix elements nonzero. A laser field is resonantly driving the
sample whereas a second weaker and lower frequency coherent field additionally
pumps it near resonance with the dynamically-Stark-splitted states. Due to
existence of differing permanent dipole moments in the excited and ground bare
states, quantum coherences among the involved dressed-states are induced
leading to inversion in the steady-state. Furthermore, large refractive indices
are feasible as well as the determination of the diagonal matrix elements via
the absorption or emission spectra. The results apply to available
biomolecular, spin or asymmetric quantum dot systems.
