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.
@article{arxiv.cond-mat/0003325,
title = {Opening an energy gap in an electron double layer system at integer filling factor in a tilted magnetic field},
author = {E. V. Deviatov and V. S. Khrapai and A. A. Shashkin and V. T. Dolgopolov and F. Hastreiter and A. Wixforth and K. L. Campman and A. C. Gossard},
journal= {arXiv preprint arXiv:cond-mat/0003325},
year = {2009}
}
Comments
4 pages, 4 figures included, to appear in JETP Letters