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Two‐Photon Spectroscopy of Excitons and Polaritons in Strained ZnTe
Author(s) -
Fröhlich D.,
Kubacki F.,
Schlierkamp M.,
Mayer H.,
Rössler U.
Publication year - 1993
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.2221770213
Subject(s) - polariton , exciton , exciton polaritons , transverse plane , physics , polarization (electrochemistry) , photon , condensed matter physics , scattering , electron , atomic physics , optics , chemistry , quantum mechanics , structural engineering , engineering
Two‐photon absorption is measured in ZnTe single crystals with uniaxial stress applied along [001] and [111] crystal directions. Using different polarization configurations, two‐photon selection rules, and the polariton fusion model all observed resonances in the region of the 1S exciton are identified as longitudinal excitons or transverse polaritons. A quantitative interpretation of the experimental data becomes possible by calculating the exciton and polariton dispersion in the eightfold space of the 1S exciton. This calculation takes full account of the applied stress, electron‐hole exchange interaction, and finite wave vector. Values for the deformation potentials D d = 5.47 eV, D u = 1.89 eV, D u ′= 3.63 eV and for unstrained ZnTe the transverse exciton energy E T = 2.3809 eV and the longitudinal transverse splitting Δ LT = 0.5 meV are derived.