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arXiv 1203.0004cond-mat.mes-hall
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负有效场中的自旋复合费米子

Spinful Composite Fermions in a Negative Effective Field

Simon C. Davenport, Steven H. Simon

摘要:

本文研究了填充分数ν= 2/3,3/5和4/7时的分数量子霍尔复合费米子波函数。在这些填充分数中的每一个,都有几个可能的波函数具有不同的自旋极化,这取决于有多少自旋向上或自旋向下的复合费米子朗道能级被占据。我们计算了可能的复合费米子波函数的能量,并预测了不同自旋极化的基态之间的跃迁,塞曼能量与库仑能量的比值是不同的。以前,几个实验已经观察到不同的自旋极化状态之间的这种转变,我们直接比较我们的预测,这些实验。为了更详细地比较理论和实验,我们还包括有限厚度的影响,在我们的计算。我们发现合理的实验和复合费米子理论之间的定性协议。最后,我们考虑了填充因子ν= 2+2/3,2+3/5和2+4/7的复合费米子态。后两种情况下,我们预测自旋极化,即使在零塞曼能量。

英文摘要:

In this paper we study fractional quantum Hall composite fermion wavefunctions at filling fractions ν= 2/3, 3/5, and 4/7. At each of these filling fractions, there are several possible wavefunctions with different spin polarizations, depending on how many spin-up or spin-down composite fermion Landau levels are occupied. We calculate the energy of the possible composite fermion wavefunctions and we predict transitions between ground states of different spin polarizations as the ratio of Zeeman energy to Coulomb energy is varied. Previously, several experiments have observed such transitions between states of differing spin polarization and we make direct comparison of our predictions to these experiments. For more detailed comparison between theory and experiment, we also include finite-thickness effects in our calculations. We find reasonable qualitative agreement between the experiments and composite fermion theory. Finally, we consider composite fermion states at filling factors ν= 2+2/3, 2+3/5, and 2+4/7. The latter two cases we predict to be spin polarized even at zero Zeeman energy.

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