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Coherent manipulation of quadrupole biexcitons in cuprous oxide by 2D femtosecond spectroscopy
Author(s) -
Roslyak Oleksiy,
Aparajita Upali,
Birman Joseph L.,
Mukamel Shaul
Publication year - 2012
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/pssb.201147402
Subject(s) - biexciton , exciton , physics , quadrupole , spectroscopy , atomic physics , dephasing , quasiparticle , femtosecond , coherence (philosophical gambling strategy) , coherent spectroscopy , molecular physics , condensed matter physics , quantum mechanics , laser , superconductivity , raman scattering , raman spectroscopy , coherent anti stokes raman spectroscopy
We propose using coherent optical spectroscopy to study and control optically‐forbidden (dark) biexciton states in crystals of cuprous oxide. These states are revealed in the correlation spectra cross resonances due to coherence with the quadrupole allowed 1 S exciton manifold. The signal is obtained by means of sum‐over‐state formalism and comparing equations of motion for the weakly interacting quadrupole excitons with their analogue of non‐interacting quasiparticles. The dephasing mechanisms include rapid Auger relaxation of biexcitons which allegedly impedes the Bose–Einstein condensation of quadrupole excitons. An interesting effect attributed to the deviation of the quadrupole excitons from the ortho – para excitons picture is that the positions of the biexciton resonances are defined by the energy splitting between $\Gamma _{5;yz}^{ + } $ and $\Gamma _{5;xz}^{ + } $ excitons and can be tuned by an external perturbation. Possible quantum computing and lasing applications of the quadrupole induced chirality effects of the excitons and biexcitons, and coherence between exciton/biexciton manifolds are discussed.