The tilting angular dependence of the energy gap was measured in the bilayer quantum Hall state at the Landau level filling ν = 1 by changing the density imbalance between the two layers. The observed gap behavior shows a continuous transformation from the bilayer balanced density state to the monolayer state. Even a sample with 33 K tunneling gap shows the same activation energy anomaly reported by Murphy et al. [1]. We discuss a possible relation between our experimental results and the quantum Hall ferromagnet of spins and pseudospins.
We have investigated ν=1 quantum Hall (QH) state in a double-layer system around the commensurate (C) -incommensurate (IC) transition. Detailed magnetoresistance measurements around the C-IC transition reveal that there are two minima within the ν=1 QH state. These minima, being induced by the difference of the in-plane magnetic field, correspond to the C and IC phases, respectively. The region between the two minima may be the soliton lattice phase predicted by theoretical analyses.
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