Electron correlation in the second Landau level; a competition between many, nearly degenerate quantum phases

Abstract

At a very low temperature of 9mK, electrons in the 2nd Landau level of an extremely high mobility two-dimensional electron system exhibit a very complex electronic behavior. With 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.

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