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arXiv 0903.4415cond-mat.mes-hallcond-mat.str-el
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宽量子阱中ν=1/4的分数量子霍尔态

Fractional quantum Hall state at ν=1/4 in a wide quantum well

Z. Papic, G. Moller, M. V. Milovanovic, N. Regnault, M. O. Goerbig

摘要:

利用Monte-Carlo方法和精确对角化方法,在球几何条件下,研究了宽量子阱中填充因子为$ν=1/4$的量子Hall态的几种可压缩和不可压缩候选波函数.通过保留量子阱的两个最低子带,将量子阱建模为双组分系统。我们做了一个直接的连接与现象学的有效双层模型,这是常用的宽量子阱的描述,我们比较我们的研究结果与已建立的结果在$ν=1/2$在最低朗道水平。在$ν=1/4$上,对Halperin(5,5,3)态和(7,7,1)态、广义Haldane-Rezayi态和Moore-Read Pfweian态的重叠计算表明,在Halperin(5,5,3)态和Moore-Read Pfweian态的相互作用中,很可能实现不可压缩态.我们的数值计算表明,后者是非常容易受到相互作用系数的变化,从而表明,所观察到的状态是多组分的性质。

英文摘要:

We investigate, with the help of Monte-Carlo and exact-diagonalization calculations in the spherical geometry, several compressible and incompressible candidate wave functions for the recently observed quantum Hall state at the filling factor $ν=1/4$ in a wide quantum well. The quantum well is modeled as a two-component system by retaining its two lowest subbands. We make a direct connection with the phenomenological effective-bilayer model, which is commonly used in the description of a wide quantum well, and we compare our findings with the established results at $ν=1/2$ in the lowest Landau level. At $ν=1/4$, the overlap calculations for the Halperin (5,5,3) and (7,7,1) states, the generalized Haldane-Rezayi state and the Moore-Read Pfaffian, suggest that the incompressible state is likely to be realized in the interplay between the Halperin (5,5,3) state and the Moore-Read Pfaffian. Our numerics shows the latter to be very susceptible to changes in the interaction coefficients, thus indicating that the observed state is of multicomponent nature.

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