High-pressure and high-magnetic-field study of energy transfer from excitons into local d electrons in a CdTe/(Cd, Mn)Te quantum well structure

Abstract

Photoluminescence measurements have been conducted for a CdTe/Cd 1−x Mn x Te (x = 0.4) single-quantum-well structure at low temperatures under pressures to 0.49 GPa and magnetic fields to 60 T. At the ambient pressure, a new emission was induced by the application of a magnetic field. The emission has been assigned to exciton emission from the barrier layer, which is suppressed below 9 T due to the energy transfer from the exciton to local d electrons. At 0.49 GPa, the emission recovered at 44 T. In the field region where the energy transfer occurs, an anomalous red-shift of the exciton energy was observed clearly for the case of the ambient pressure. The alloy potential fluctuation effect and the magnetopolaron effect are examined as candidates for the mechanism to cause this phenomenon.

Miniature diamond anvil cell for broad range of high pressure measurements

“…24 has very small size ͑less than 8 mm͒ and is manufactured from nonmagnetic NiCrAl alloy, however, the authors claim that maximum pressure that can be reached with this cell 24 is about 14 GPa. Very interesting idea of completely nonmagnetic and nonconducting ͑plastic͒ DAC was realized by Tozer 25 for experiments in very strong dynamic magnetic fields, 26,27 but maximum pressure in this cell is limited by a few gigapascal. The common disadvantage of such cells [22][23][24][25] is limited geometrical opening, which narrows down their applicability in other techniques.…”