Bishop N C, Padmanabhan M, Vakili K, Shkolnikov Y P, De Poortere E P, Shayegan M
Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Phys Rev Lett. 2007 Jun 29;98(26):266404. doi: 10.1103/PhysRevLett.98.266404. Epub 2007 Jun 27.
We report magnetotransport measurements of fractional quantum Hall states in an AlAs quantum well around a Landau level filling factor nu=3/2, demonstrating that the quasiparticles are composite fermions (CFs) with a valley degree of freedom. By monitoring the valley level crossings for these states as a function of applied symmetry-breaking strain, we determine the CF valley susceptibility and polarization. The data can be explained well by a simple Landau level fan diagram for CFs, and are in nearly quantitative agreement with the results reported for CF spin polarization.
我们报告了在朗道能级填充因子ν = 3/2附近的AlAs量子阱中对分数量子霍尔态的磁输运测量，证明了准粒子是具有谷自由度的复合费米子（CFs）。通过监测这些态的谷能级交叉作为施加的对称性破缺应变的函数，我们确定了CF谷磁化率和极化。这些数据可以用一个简单的CFs朗道能级扇形图很好地解释，并且与报道的CF自旋极化结果几乎在定量上一致。
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