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arXiv 1909.06191cond-mat.str-el
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填充因子为3/2时分数量子Hall态的局域不可压缩性

The Local Incompressibility of Fractional Quantum Hall States at a Filling Factor of 3/2

L. V. Kulik, V. A. Kuznetsov, A. S. Zhuravlev, V. Umansky, I. V. Kukushkin

摘要:

研究了具有轨道动量$ΔM = 1$和自旋在磁场轴$ΔS_z = 1$上的投影的二维电子系统在填充因子为3/2附近的中性激发。结果表明,3/2态是二维电子系统自旋有序的填充因子依赖性中的奇点。在$ν=3/2$附近,尽管最低能级中的空位数宏观上很大,但表现出用于激发到基态的弛豫时间($τ= 13$ $μ\text{s}$)的显著增加。弛豫速率的降低与自旋翻转和电子密度重排引起的基态自旋织构转变有关。我们认为3/2态是一个局部不可压缩的分数量子Hall态。

英文摘要:

We studied neutral excitations in a two-dimensional electron system with an orbital momentum $ΔM = 1$ and spin projection over magnetic field axis $ΔS_z = 1$ in the vicinity of a filling factor of 3/2. It is shown that the 3/2 state is a singular point in the filling factor dependence of the spin ordering of the two-dimensional electron system. In the vicinity of $ν=3/2$, a significant increase in the relaxation time ($τ= 13$ $μ\text{s}$) for the excitations to the ground state is exhibited even though the number of vacancies in the lowest energy level is macroscopically large. The decrease of the relaxation rate is related to the spin texture transformation in the ground state induced by spin flips and electron density rearrangement. We claim the 3/2 state is a locally incompressible fractional quantum Hall state.

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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