Far-Infrared Excitations below the Kohn Mode: Internal Motion in a Quantum Dot
Roman Krahne, Vidar Gudmundsson, Christian Heyn, Detlef Heitmann
Abstract
We have investigated the far-infrared response of quantum dots in modulation doped GaAs heterostructures. We observe novel modes at frequencies below the center-of-mass Kohn mode. Comparison with Hartree-RPA 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.
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