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.
Cite
@article{arxiv.cond-mat/0102005,
title = {Far-Infrared Excitations below the Kohn Mode: Internal Motion in a Quantum Dot},
author = {Roman Krahne and Vidar Gudmundsson and Christian Heyn and Detlef Heitmann},
journal= {arXiv preprint arXiv:cond-mat/0102005},
year = {2007}
}
Comments
8 pages, LaTeX with integrated 6 PostScript figures