ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We study theoretically the wave functions and dispersion relation of electrons in grid-inserted GaAs quantum-well structures, where very thin AlAs rods are periodically inserted in the middle of quantum wells with a typical spacing of 100 A(ring). It has been found that when the grid thickness is even a few monolayers, the electronic motion along the lateral direction is strongly modified, resulting in the formation of both quantum-wire states and in-plane superlattice states. For example, when the width and spacing of the grid are 81 A(ring), the ground miniband width becomes as small as 12 meV for the grid thickness of one monolayer (ML) and can be further reduced to 4 meV when the grid thickness is 5 ML. It is further shown that the effect of grid potential is strongly dependent on the shape of the wave functions, and the lateral confinement is effective only for those having high amplitude in the central portion of the quantum well.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.348625
