2 research outputs found
Phenomenological Understanding of a Transport Regime with Reflection Symmetry in the Quantum Hall System in a Composite Fermion Picture
In this paper, we present a phenomenological picture based on the composite
fermion theory, in responding to the recent discovery by Shahar et al. of a new
transport regime near the transition from a quantum Hall liquid to a
Hall insulator(ref[8]). In this picture, the seemingly unexpected reflection
symmetry in the longitudinal resistivity can be understood clearly
as due to the symmetry of the gapful excitations which dominate
across the transition, and the abrupt change in at the
transition. The parameter in the linear fit of in ref[8] is
also given a simple physical meaning and the effective mass can be calculated
from , which gives a reasonable value of several electron band mass.
When taking into account the result of network model, the almost invariant Hall
resistivity across the transition is also well-understood.Comment: 4 pages, RevTex, final version to appear in Phys.Rev.
A different view of the quantum Hall plateau-to-plateau transitions
We demonstrate experimentally that the transitions between adjacent integer
quantum Hall (QH) states are equivalent to a QH-to-insulator transition
occurring in the top Landau level, in the presence of an inert background of
the other completely filled Landau levels, each contributing a single unit of
quantum conductance, , to the total Hall conductance of the system.Comment: 10 pages, 4 figures, Revtex 3.