Physical Review B 52, 17044-17047 (1995)
[Issue 24 -- December 15, 1995]
Landau-level mixing and extended states in the quantum Hall effect
V. Kagalovsky, B. Horovitz, and Y. Avishai
Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105,
Israel
(Received 24 August 1995)
We study the energies of extended states for two coupled Landau bands within
a network model as
a function of Delta , the bare energy separation of extended states in
the absence of level mixing. As
Delta increases the energy separation of the extended states becomes less
than the bare energy
separation, i.e., at high-level separation, level repulsion changes into
level attraction. The level
attraction leads to a minimum in the energy of the lower state at a finite
magnetic field, consistent
with level floating at low fields. For a spin-split Landau level we predict
level attraction at high
magnetic fields.
©1995 The American Physical Society.
PACS: 71.30.+h 73.40.Hm