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Opening an energy gap in an electron double layer system at integer filling factor in a tilted magnetic field

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arxiv cond-mat/0003325 v2 pith:3NG5INGA submitted 2000-03-20 cond-mat.mes-hall

E.V. Deviatov , V.S. Khrapai , A.A. Shashkin , V.T. Dolgopolov (Institute of Solid State Physics RAS , Chernogolovka , Russia) F. Hastreiter , A. Wixforth (Ludwig-Maximilians-Universität , München
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Germany) K.L. Campman A.C. Gossard (Materials Department Center for Quantized Electronic Structures University of California California USA)
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keywords magneticdoubleelectronfactorfieldfieldsfillinglayer
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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 $\nu=3$ 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.

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