Insulator-quantum Hall transitions in two-dimensional electron gas containing self-assembled InAs dots
✍ Scribed by Gil-Ho Kim; C.-T. Liang; C.F. Huang; Myung-Hyun Lee; J.T. Nicholls; D.A. Ritchie
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 129 KB
- Volume
- 17
- Category
- Article
- ISSN
- 1386-9477
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We have performed transport experiments on two-dimensional electron gases in a GaAs-Alo.sGa,-/As heterostructure containing InAs self-assembled quantum dots in close proximity to the heterointerface. We find that the dots act as repulsive scatterers and dominate the mobility. In the samples with the
We show that the presence of InAs dots embedded in a host GaAs quantum well containing a two-dimensional electron gas dramatically modiÿes the cyclotron resonance (CR). Far-infrared CR measurements show two modes with di erent dispersions with applied magnetic ÿeld B. The lower-frequency mode, with