ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The first room-temperature two-dimensional heavy hole exciton red shift, greater than 25 meV due to the exchange of Van Hove-type M1 and quantum well excitons, was observed by photocurrent measurements in molecular beam epitaxy grown superlattices with periods of 30 A(ring) GaAs/25 A(ring) Ga0.5Al0.5As. At a photon energy of 1.66 eV, a 3000 cm−1 absorption change due to the blue shift of the superlattice absorption edge was also observed at room temperature in superlattices with periods of 20 A(ring) GaAs/20 A(ring) Ga0.5Al0.5As.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.101326