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Quantum Beats of Excitons in Cu 2 O at Double Optical Resonance
Author(s) -
Shmiglyuk M.,
Bobrysheva A.,
Pavlov V.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199702)199:2<427::aid-pssb427>3.0.co;2-y
Subject(s) - exciton , quantum beats , resonance (particle physics) , physics , quantum , atomic physics , optoelectronics , condensed matter physics , quantum mechanics
The quantum beats (QB) in the time‐dependent absorption intensity of the probe pulse and the spontaneous luminescence one in Cu 2 O crystal at the condition of double optical resonance are studied theoretically. It is assumed that the pump is performed by the CO 2 laser pulse, which couples dynamically the 1s ( Γ + 5 ) and 2p ( Γ — 4 , Γ — 5 , Γ — 3 , Γ — 2 ) excitonic states and leads to their splitting into two or three quasienergy levels. The frequency of the probe pulse is in the region of the Γ + 5 exciton resonance. The respective intensities for different directions of the electric field E L of the pump, the polarization ξ of the probe pulse, and the observation q are obtained. The QB take place with the doubled Raby frequency, which at different E L , ξ , and q includes different sets of matrix elements of dipole transitions between 1s ( Γ + 5 ) and 2p ( Γ — 4 , Γ — 5 , Γ — 3 , Γ — 2 ) levels. These unknown matrix elements can be obtained, measuring the period of the QB.