Novel effects produced on a two dimensional electron gas by introducing InAs dots in the plane of the quantum well

✍ Scribed by S Cinà; D.D Arnone; H.P Hughes; D Whittaker; M Pepper; D.A Ritchie

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 89 KB
• Volume: 6
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(99)00153-8

✦ Synopsis

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 a sub-linear dependence on B, is identiÿed as a CR at low B, developing into a skipping orbit around the dot perimeters at higher B. This has not been previously observed for a system with randomly distributed scatterers. The higher-frequency mode is identiÿed as a magnetoplasmon localised by the conÿning e ect of the arrays of repulsive potentials due to the dots in the well.