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Deformation Effects on Biexcitons in Wurtzite‐Type Crystals
Author(s) -
Goede O.
Publication year - 1977
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.2220810125
Subject(s) - biexciton , wurtzite crystal structure , exciton , ground state , condensed matter physics , exchange interaction , hamiltonian (control theory) , physics , atomic physics , materials science , quantum mechanics , ferromagnetism , mathematical optimization , mathematics , diffraction
The effects of uniaxial stress on optical biexciton transitions in wurtzite‐type crystals are discussed in the framework of an effective‐mass approximation using the Bir‐Pikus Hamiltonian and taking into account electron–hole exchange interaction and JJ ‐coupling of the two holes. The calculated stress‐induced energy shift, splitting, and polarization of the ground‐state biexciton line for CdS are compared with the available results of piezoemission measurements. Furthermore, the stress dependence of the optical transitions between the AA(Γ 1 ) biexciton ground state and A(Γ 6 ) and B(Γ 1 , Γ 5 ,) exciton final states are discussed. In CdS the AA(Γ 1 ) → A(Γ 6 ) emission line may hardly be detectable for σ ⟂ c . The AA(Γ 1 ) → B(Γ 1 , Γ 5 ) lines, however, should be observable for σ ∥ c and also the expected values of the electron‐hole exchange interaction in the exciton states and the JJ ‐coupling of the holes in the biexciton states.