Far-infrared excitations below the Kohn mode: Internal motion in a quantum dot
- 9 April 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 63 (19) , 195303
- https://doi.org/10.1103/physrevb.63.195303
Abstract
We have investigated the far-infrared response of quantum dots in modulation doped GaAs heterostructures. We observe modes at frequencies below the center-of-mass Kohn mode. Comparison with Hartree–random-phase-approximation calculations show that these modes arise from the flattened potential in our field-effect confined quantum dots. They reflect pronounced relative motion of the charge density with respect to the center of mass.Keywords
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