Excitons and Excitonic Molecules in Mixed $Zn(P_{1-x}As_{x})_{2}$ Crystals

Details Excitons and Excitonic Molecules in Mixed $Zn(P_{1-x}As_{x})_{2}$ Crystals Excitons and Excitonic Molecules in Mixed $Zn(P_{1-x}As_{x})_{2}$ Crystals

2001-03-19

arxiv.org/abs/cond-mat/0103388v1

Physics

Condensed Matter

Materials Science

10 pages, 7 figures, paper submitted to Physica B: Condensed Matter

Scientific paper

10.1016/S0921-4526(01)00638-X

Low-temperature (1.8 K) excitonic absorption, reflection and photoluminescence spectra of mixed $Zn(P_{1 - x}As_{x})_{2}$ crystals were studied at $x = $0.01, 0.02, 0.03 and 0.05. Energy gap and rydbergs of excitonic B, C and A-series decrease monotonically at the increase of $x$. Spectral half-widths of absorption $n = 1$ lines of B and A-series increase monotonically at the increase of $x$ due to fluctuations of crystal potential. Emission lines of excitonic molecules were observed in photoluminescence spectra of $Zn(P_{1 - x}As_{x})_{2}$ crystals. Binding energy of molecule increases at the increase of $x$ that is due to the decrease of the electron-hole mass ratio.

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