title: Quantized ν = 5/2 state in a two-subband quantum hall system.
abstract: The evolution of the fractional quantum Hall state at filling 5/2 is studied in density tunable two-dimensional electron systems formed in wide wells in which it is possible to induce a transition from single- to two-subband occupancy. In 80 and 60 nm wells, the quantum Hall state at 5/2 filling of the lowest subband is observed even when the second subband is occupied. In a 50 nm well, the 5/2 state vanishes upon second subband population. We attribute this distinct behavior to the width dependence of the capacitive energy for intersubband charge transfer and of the overlap of the subband probability densities.
authors.affiliation: Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Nuebler
authors.forename: B
authors.initials: B
authors.lastname: Friess
authors.forename: V
authors.initials: V
authors.lastname: Umansky
authors.forename: B
authors.initials: B
authors.lastname: Rosenow
authors.forename: M
authors.initials: M
authors.lastname: Heiblum
authors.forename: K
authors.initials: K
authors.lastname: von Klitzing
authors.forename: J
authors.initials: J
authors.lastname: Smet