Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-03-12
J. Phys. Soc. Jpn., Vol.79, No.6, p.064717, (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 7 figures
Scientific paper
10.1143/JPSJ.79.064717
The ground state of a bilayer quantum Hall system at $\nu_{\rm T}=1$ 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.
Shibata Naokazu
Yoshioka Daijiro
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