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. (Phys. Rev. Lett. 72 (1994) 728). We discuss a possible relation between our experimental results and the quantum Hall ferromagnet of spins and pseudospins.
|ジャーナル||Physica E: Low-Dimensional Systems and Nanostructures|
|出版ステータス||出版済み - 2004 4月|
|イベント||15th International Conference on ELectronic Propreties - Nara, 日本|
継続期間: 2003 7月 14 → 2003 7月 18