Opening an energy gap in an electron double layer system at integer filling factor in a tilted magnetic field
E.V. Deviatov, V.S. Khrapai, A.A. Shashkin, V.T. Dolgopolov, F. Hastreiter, A. Wixforth, K.L. Campman, A.C. Gossard
Abstract
We employ magnetocapacitance measurements to study the spectrum of a double layer system with gate-voltage-tuned electron density distributions in tilted magnetic fields. For the dissipative state in normal magnetic fields at filling factor
ν=3
and 4, a parallel magnetic field component is found to give rise to opening a gap at the Fermi level. We account for the effect in terms of parallel-field-caused orthogonality breaking of the Landau wave functions with different quantum numbers for two subbands.