Optical Signatures from Magnetic 2-D Electron Gases in High Magnetic Fields to 60211 Tesla

摘要

We present experiments in the 60 Tesla Long-Pulse magnet at the Los Alamos211u001eNational High Magnetic Field Lab (NHMFL) focusing on the high-field, low 211u001etemperature photoluminescence (PL) from modulation-dopedZnSe/Zn(Cd,Mn)Se single 211u001equantum wells. High-speed charge-coupled array detectors and the long (2 second) 211u001eduration of the magnet pulse permit continuous acquisition of optical spectra 211u001ethroughout a single magnet shot. High-field PL studies of the magnetic 2D 211u001eelectron gases at temperatures down to 350mK reveal clear intensity oscillations 211u001ecorresponding to integer quantum Hall filling factors, from which we determine 211u001ethe density of the electron gas. At very high magnetic fields,steps in the PL 211u001eenergy are observed which correspond to the partial unlocking of 211u001eantiferromagnetically bound pairs of Mn<sup& gt;2+</sup> 211u001espins.