Eur. Phys. J. B 28, 111-115 (2002)
https://doi.org/10.1140/epjb/e2002-00206-x

Characterization of Bernstein modes in quantum dots

¹ Departament de Física, Universitat de les Illes Balears, 07071 Palma de Mallorca, Spain
² Science Institute, University of Iceland, Dunhaga 3, 107 Reykjavik, Iceland

Corresponding author: ^a dfslsc4@clust.uib.es

Received: 3 December 2001
Revised: 5 April 2002
Published online: 9 July 2002

Abstract

The dipole modes of non-parabolic quantum dots are studied by means of their current and density patterns as well as with their local absorption distribution. The anticrossing of the so-called Bernstein modes originates from the coupling with electron-hole excitations of the two Landau bands which are occupied at the corresponding magnetic fields. Non-quadratic terms in the potential cause an energy separation between bulk and edge current modes in the anticrossing region. On a local scale the fragmented peaks absorb energy in complementary spatial regions which evolve with the magnetic field.