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
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.
PACS: 73.21.-b – Electron states and collective excitations in multilayers, quantum wells, mesoscopic and nanoscale systems / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002