Repulsion of fundamental edge magnetoplasmons at integer filling factors and nonlocal responses
Concordia University, Department of Physics
1455 de Maisonneuve Blvd O, Montréal, Québec, Canada, H3G
2 Institute of Semiconductor Physics, National Academy of Sciences 45 Pr. Nauky, Kiev 252650, Ukraine
Accepted: 17 February 1999
A microscopic treatment of edge magnetoplasmons (EMPs) is presented for strong magnetic fields, low temperatures, integer filling factors ν, and confining potentials that allow Landau-level (LL) flattening to be neglected. Local and nonlocal contributions to the current density are included. The effect of nonlocality on the fundamental EMPs is weak while other modes can be substantially affected. For nonlocal responses result in a dipole mode with dispersion relation . For , inter-LL Coulomb coupling leads to a strong repulsion of the uncoupled, fundamental LL modes.
PACS: 73.20.Mf – Collective excitations (including plasmons and other charge-density excitations) / 73.40.Hm – Quantum Hall effect (integer and fractional) / 71.70.Di – Landau levels
© EDP Sciences, 1999