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Near band-gap regions in (a) RF and (b) PL spectra for single crystals taken at 6 K and 4.2 K, respectively, showing lines of free and bound excitons.
(a) Near band-gap regions in PL spectra for single crystals taken at unpolarized, polarized and conditions at 6 K (offset for clarity); (b) the A and B free exciton region of the unpolarized PL spectra in single crystals fitted with A, B, , and Lorentz shape curves.
(a) The evolution of the B ground state exciton and the and excited states under the influence of magnetic fields at , (b) dependence of the spectral positions of the lines related to the ground B and and excited states of free excitons on the magnetic field strength.
The spectral positions of the excitonic lines fitted with Lorentzians.
The band gaps, binding energies , and Bohr radii of the A and B excitons.
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