  We study the fractional quantum Hall effect in a bilayer with
charge-distribution imbalance induced, for instance, by a bias gate voltage.
The bilayer can either be intrinsic or it can be formed spontaneously in wide
quantum wells, due to the Coulomb repulsion between electrons. We focus on
fractional quantum Hall effect in asymmetric bilayer systems at filling factor
nu=4/11 and show that an asymmetric Halperin-like trial wavefunction gives a
valid description of the ground state of the system.

Strongly Correlated Electrons;Mesoscale and Nanoscale Physics