Optical Absorption Edge in GaSe under Hydrostatic Pressure

J. M. Besson; K. P. Jain; A. Kuhn

doi:10.1103/PhysRevLett.32.936

Optical Absorption Edge in GaSe under Hydrostatic Pressure

J. M. Besson, K. P. Jain, and A. Kuhn

Phys. Rev. Lett. 32, 936 – Published 29 April 1974

Abstract

A study of the optical absorption spectrum of GaSe at the energy gap shows that the strength of the exciton line decreases as hydrostatic pressure is increased. It is proposed that this effect comes from increasing interference of the discrete exciton line with a continuum of structure due to indirect interband electronic transitions. The sign and magnitude of the pressure coefficients of the gaps in gallium chalcogenides are found to be consistent with recent band-structure studies.

Received 4 March 1974

DOI:https://doi.org/10.1103/PhysRevLett.32.936

Authors & Affiliations

J. M. Besson^† and K. P. Jain^*,†

Laboratoire de Physique des Solides de l'Université Paris VI, 75230 Paris Cédex 05, France

A. Kuhn^‡

Laboratoire de Luminescence II de l'Université Paris VI, 75230 Paris Cédex 05, France

^*Permanent address: Physics Department, Indian Institute of Technology, New Delhi 29, India.
^†Laboratoire Associé au Centre National de la Recherche Scientifique.
^‡Equipe Associée au Centre National de la Recherche Scientifique.