Optically Detected Resonance (ODR) Spectroscopy of GaAs/AlGaAs Quantum Wells with Charged-Coupled Device (CCD) Detection.
Abstract
The technique of ODR consists of monitoring the changes in photoluminescence (PL) from a sample induced by the absorption of far-infrared (FIR) laser radiation. In these experiments a liquid-nitrogen-cooled CCD array has been used to record the changes in the entire PL spectrum at high resolution as a function of magnetic field, rather than monitoring a single PL feature as had been done previously(Kono, J. et al.) (1995) Phys. Rev. B 52, R8654.. A 210 ÅGaAs/Al_0.3Ga_0.7As sample doped at 7×10^9 cm-2 over the central third of the well was studied. The FIR laser was tuned to 118.8 μm. ODR signals as functions of the various parameters under our control (optical laser wavelength and power, FIR laser power, and temperature) were recorded at resonant magnetic fields for the various excitations observed (2 T -- D^0(1sarrow 2p_+); 4 T -- D^- singlet; 6.2 T -- e-CR). Based on these observations ODR mechanisms will be discussed. Supported in part by the ONR MFEL Program.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1997
- Bibcode:
- 1997APS..MAR.H4178H