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arXiv 1606.03485cond-mat.str-el
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分数量子霍尔效应中自旋跃迁的朗道能级混合和粒子-空穴对称性破缺

Landau-Level Mixing and Particle-Hole Symmetry Breaking for Spin Transitions in the Fractional Quantum Hall Effect

Yuhe Zhang, A. Wójs, J. K. Jain

摘要:

分数量子霍尔效应中的自旋跃迁提供了对不同自旋极化态之间微小能量差的直接测量,从而作为分数量子霍尔效应理论定量准确性的极其灵敏的测试,特别是朗道能级混合在提升粒子-空穴对称性中的作用。我们报告一个准确的定量研究,这种物理,评估的影响,朗道级混合的非微扰方式使用固定相扩散蒙特卡罗方法。我们发现我们的计算临界塞曼能量和实验测量值之间的极好的协议。特别是,我们发现,也做实验,分数量子霍尔态在填充因子$ν=2-n/(2n\pm 1)$的临界塞曼能量显着高于那些$ν=n/(2n\pm 1)$,由于朗道级混合的粒子-空穴对称性的提升的定量签名。

英文摘要:

The spin transitions in the fractional quantum Hall effect provide a direct measure of the tiny energy differences between differently spin-polarized states, and thereby serve as an extremely sensitive test of the quantitative accuracy of the theory of the fractional quantum Hall effect, and, in particular, of the role of Landau-level mixing in lifting the particle-hole symmetry. We report on an accurate quantitative study of this physics, evaluating the effect of Landau-level mixing in a nonperturbative manner using a fixed-phase diffusion Monte Carlo method. We find excellent agreement between our calculated critical Zeeman energies and the experimentally measured values. In particular, we find, as also do experiments, that the critical Zeeman energies for fractional quantum Hall states at filling factors $ν=2-n/(2n\pm 1)$ are significantly higher than those for $ν=n/(2n\pm 1)$, a quantitative signature of the lifting of particle-hole symmetry due to Landau-level mixing.

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