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VOLUME 71 (2000) | ISSUE 12 | PAGE 724
Opening an energy gap in an electron double layer system at integer filling factor in a tilted magnetic field
PACS: 72.20.My, 73.40.Kp
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 υ = 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.