Photoluminescence studies of modulation doped coupled double quantum wells in magnetic fields
- Northeastern Univ., Boston, MA (United States)
- Sandia National Labs., Albuquerque, NM (United States)
- Los Alamos National Lab., NM (United States)
We have studied the photoluminescence spectra of a series of mudulation doped couple double quantum well structures in parallel and perpendicular magnetic fields to 62 tesla at 4K and 77K, for B{parallel}a, the spectra display distinct Landau level transitions which show anti-crossing with the e1-hh1 exciton. At high fields, the lowest conduction band-valence exciton approaches the extrapolated 0- 0 Landau level. About 25 Tesla, there is valence band mixing of the e1-lh1, e1-hh2, e1-hh1 transitions. The spectral peaks display a diamagnetic shift in low in-plane magnetic fields which become linear in high fields. At magnetic fields beyond 40T, spin splitting is observed for both B{parallel}z and B{perpendicular} geometries. The partial energy gap discovered in conductance measurements in in-plane fields was not conclusively observed using photoluminescence spectroscopy, although anomalies in the energy dependence of the lowest level with magnetic field were evident at similar field values.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000; AC04-76DP00789
- OSTI ID:
- 286174
- Report Number(s):
- SAND--96-1516C; CONF-960781--3; ON: DE96014068; CNN: Agreement DMR 5024-545-22
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magnetoluminescence oscillations of a doped (Al,Ga)As/GaAs single heterojunction
Anticrossing and coupling of light-hole and heavy-hole states in (001) GaAs/Al{sub x}Ga{sub 1-x}As heterostructures