Stability of the Excitonic Phase in Bilayer Quantum Hall Systems at Total Filling One —Effects of Finite Well Width and Pseudopotentials—
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概要
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The ground state of a bilayer quantum Hall system at $\nu_{\text{T}}=1$ with model pseudopotential is investigated by the DMRG method. Firstly, pseudopotential parameters appropriate for the system with finite layer thickness are derived, and it is found that the finite thickness makes the excitonic phase more stable. Secondly, a model, where only a few pseudopotentials with small relative angular momentum have finite values, is studied, and it is clarified how the excitonic phase is destroyed as intra-layer pseudopotential becomes larger. The importance of the intra-layer repulsive interaction at distance twice of the magnetic length for the destruction of the excitonic phase is found.
- 2010-06-15
著者
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Shibata Naokazu
Department Of Basic Science University Of Tokyo
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Yoshioka Daijiro
Department Of Basic Science Graduate School Of Arts And Sciences University Of Tokyo
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Naokazu Shibata
Department of Physics, Tohoku University, Aoba, Aoba-ku, Sendai 980-8578, Japan
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Daijiro Yoshioka
Department of Basic Science, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
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