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arXiv 1406.2387cond-mat.mes-hallcond-mat.str-el
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复合费米子的自旋极化与粒子-空穴对称性破缺

Spin-Polarization of Composite Fermions and Particle-Hole Symmetry Breaking

Yang Liu, S. Hasdemir, A. Wójs, J. K. Jain, L. N. Pfeiffer, K. W. West, K. W. Baldwin, M. Shayegan

摘要:

研究了限制在对称GaAs量子阱中的二维电子系统中分数量子霍尔态的自旋极化能($α_{\rm C}$)。我们发现随着阱宽的增加,$α_{\rm C}$显著降低。在具有可比电子层厚度的系统中,朗道能级填充$ν=3/2$附近的分数态的$α_{\rm C}$大约是$ν=1/2$附近的分数态的两倍,这表明粒子-空穴对称性被破坏。理论计算,其中包括朗道水平混合通过一个有效的三体相互作用,和有限的层厚度,捕捉到一定的定性特征的实验结果。

英文摘要:

We study the critical spin-polarization energy ($α_{\rm C}$) above which fractional quantum Hall states in two-dimensional electron systems confined to symmetric GaAs quantum wells become fully spin-polarized. We find a significant decrease of $α_{\rm C}$ as we increase the well-width. In systems with comparable electron layer thickness, $α_{\rm C}$ for fractional states near Landau level filling $ν=3/2$ is about twice larger than those near $ν=1/2$, suggesting a broken particle-hole symmetry. Theoretical calculations, which incorporate Landau level mixing through an effective three-body interaction, and finite layer thickness, capture certain qualitative features of the experimental results.

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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