第三朗道能级中分数量子霍尔液体与气泡及维格纳晶体相之间的竞争。
Competition between a fractional quantum hall liquid and bubble and Wigner crystal phases in the third Landau level.
作者信息
Gervais G, Engel L W, Stormer H L, Tsui D C, Baldwin K W, West K W, Pfeiffer L N
机构信息
Department of Physics and Department of Applied Physics, Columbia University, New York, New York 10027, USA.
出版信息
Phys Rev Lett. 2004 Dec 31;93(26 Pt 1):266804. doi: 10.1103/PhysRevLett.93.266804. Epub 2004 Dec 21.
Magnetotransport measurements were performed in an ultrahigh mobility GaAs/AlGaAs quantum well of density approximately 3.0 x 10(11) cm(-2). The temperature dependence of the magnetoresistance Rxx was studied in detail in the vicinity of nu=9/2. In particular, we discovered new minima in Rxx at a filling factor nu approximately 41/5 and 44/5, but only at intermediate temperatures 80 approximately less than T approximately less than 120 mK. We interpret these as evidence for a fractional quantum Hall liquid forming in the N=2 Landau level and competing with bubble and Wigner crystal phases favored at lower temperatures. Our data suggest that a magnetically driven insulator-insulator quantum phase transition occurs between the bubble and Wigner crystal phases at T=0.
在密度约为3.0×10¹¹ cm⁻²的超高迁移率GaAs/AlGaAs量子阱中进行了磁输运测量。在ν = 9/2附近详细研究了磁阻Rxx的温度依赖性。特别地，我们在填充因子ν约为41/5和44/5时发现了Rxx的新极小值，但仅在中间温度80 mK≈T≈120 mK时出现。我们将这些解释为在N = 2朗道能级中形成分数量子霍尔液体并与在较低温度下更有利的气泡相和维格纳晶体相竞争的证据。我们的数据表明，在T = 0时，气泡相和维格纳晶体相之间发生了由磁驱动的绝缘体-绝缘体量子相变。
Zotero 插件