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arXiv 1003.2464cond-mat.str-el
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双层量子霍尔系统中激子相位在全填充1时的稳定性--有限阱宽和赝势的影响

Stability of the Excitonic Phase in Bilayer Quantum Hall Systems at Total Filling One -- Effects of Finite Well Width and Pseudopotentials --

Daijiro Yoshioka, Naokazu Shibata

摘要:

用DMRG方法研究了具有模型赝势的双层量子霍尔系统在$ν_{\rm T}=1$上的基态.首先推导了适用于有限层厚体系的赝势参数,发现有限层厚使激子相更加稳定。其次,研究了一个只有少数相对角动量较小的赝势具有有限值的模型,阐明了激子相是如何随着层内赝势的增大而被破坏的。层内排斥相互作用的重要性,在距离的两倍的磁性长度的激子相的破坏被发现。

英文摘要:

The ground state of a bilayer quantum Hall system at $ν_{\rm T}=1$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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