Optical Absorption of Indirect Exciton in AgCl and AgBr in High Magnetic Field

Abstract

Optical absorptions due to indirect excitons in AgCl and AgBr are measured in high magnetic field up to 150 kOe. Qualitatively our results are similar to Matsushita’s except the newly found shift of the center of gravity of the exciton levels split by a magnetic field. The g values for electrons and holes, and the exchange energies Δ, between them are re-examined and more accurate values are g^c(electron)=1.50, g_⁄⁄^v(hole, parallel to[111])=1.87 and Δ=0.7 meV for AgCl and g^c=0.88, g_⁄⁄^v=0.98 and Δ=0.31 meV for AgBr.