Far-infrared excitations in a quantum antidot at finite magnetic fields
arXiv:cond-mat/0001383 · doi:10.1143/JJAP.40.518
Abstract
We have investigated the far-infrared dipole modes of a quantum antidot submitted to a perpendicularly applied magnetic field B. The ground state of the antidot is described within local spin-density functional theory, and the spectrum within time-dependent local spin-density functional theory. The results are compared with those corresponding to a quantum dot of similar electronic surface density. The method is able to reproduce two of the more salient experimental features, namely that main bulk and edge modes have the same circular polarization, and that the negative B dispersion edge branch oscillates, having minima at the B values corresponding to fully occupied Landau levels. It fails, however, to yield the unique feature of short-period antidot lattices that the energy of the edge magnetoplasmon approaches the cyclotron frequency for small B. The existence of anticyclotron polarized bulk modes is discussed, and a detailed account of the dipole spin mode is presented.
arXiv commentTypeset using Revtex, 20 pages with 10 Postscript figures included
References in corpus (7)
- Manifestation of the Hofstadter butterfly in far-infrared absorption
- Spin and density longitudinal response of quantum dots in time-dependent local-spin-density approximation
- Magnetoplasmons in quantum rings
- Current Density Functional approach to large quantum dots in intense magnetic fields
- Far-infrared edge modes in quantum dots
- Transverse dipole spin modes in quantum dots
- Structure and far-infrared edge modes of quantum antidots at zero magnetic field