Electron correlation in the second Landau level: A competition between many nearly degenerate quantum phases
Electron correlation in the second Landau level: A competition between many nearly degenerate quantum phases
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DOI：
10.1103/physrevlett.93.176809
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发表时间：
2004-10-22
影响因子：
8.6
通讯作者：
West, KW
中科院分区：
文献类型：
--
作者：
Xia, JS;Pan, W;West, KW
在9 mK的极低温度下，极高迁移率二维电子系统的第二朗道能级中的电子表现出非常复杂的电子行为。随着填充因子的变化，不同来源的量子液体与几个绝缘相竞争，导致输运参数的不规则图案。我们观察到一个充分发展的态nu=2+2/5，从偶数分母态nu=2+1/2分离的绝缘相和nu=2+2/7和nu=2+1/5的状态包围这样的相位。在nu=2+3/8处的发展平台表明存在其他偶数分母状态。
At a very low-temperature of 9 mK, electrons in the second Landau level of an extremely high-mobility two-dimensional electron system exhibit a very complex electronic behavior. With a varying filling factor, quantum liquids of different origins compete with several insulating phases leading to an irregular pattern in the transport parameters. We observe a fully developed nu=2+2/5 state separated from the even-denominator nu=2+1/2 state by an insulating phase and a nu=2+2/7 and nu=2+1/5 state surrounded by such phases. A developing plateau at nu=2+3/8 points to the existence of other even-denominator states.