Two-Photon Spectroscopy of Excitons in ZnTe Under Uniaxial Stress

Abstract

1s and 2P excitons in ZnTe are studied by two-photon absorption with uniaxial stress up to 350MPa. The energy shift and splitting which is caused by the stress-induced valence band splitting and the envelope-hole coupling allows the determination of deformation potentials.

Growth of Zinc Chalcogenides

“…The possibility of hetero-seeding, using a (0001) sapphire substrate as a hetero-seed material, has been demonstrated for the first time in the ZnTe solution growth in a vertical Bridgman arrangement [12]. The high purity of the crystals is attested to by photon spectroscopy experiments [18] and hole mobilities as large as 7180 cm 2 /V s measured at 81 K, which is among the highest values reported so far. 15.4) [14].…”

“…There is thus a contamination of the starting charge in the case of the highest melting point compounds like ZnSe and ZnS. ZnTe crystals of very high purity as shown from two photon spectroscopy experiments [18], have been obtained by solution zone melting using the cold traveling heater method (CTHM) [14]. Depending on the purity of the starting CVD charge, ZnSe crystals of extremely high purity have been obtained by SSR as assessed from photoluminescence measurements [180].…”