Competition Between Fractional Quantum Hall Liquid, Bubble and Wigner Crystal Phases in the Third Landau Level

Abstract

Magnetotransport measurements were performed in a ultra-high mobility GaAs/AlGaAs quantum well of density $\sim 3.0\times 10^{11}$ $c{m}^{-2}$. The temperature dependence of the magnetoresistance $R_{xx}$ was studied in detail in the vicinity of $\nu =9/2$. In particular, we discovered new minima in $R_{xx}$ at filling factor $\nu \simeq 41/5$ and $44/5$, but only at intermediate temperatures $80\lesssim T\lesssim 120$ 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.

Phys. Rev. Lett.93 266804 (2004)

References in corpus (6)

• Electron correlation in the second Landau level; a competition between many, nearly degenerate quantum phases
• Fractional Quantum Hall Effect of Composite Fermions
• Transition from an electron solid to the sequence of fractional quantum Hall states at very low Landau level filling factor
• Microwave Resonance of 2D Wigner Crystal around integer Landau fillings
• Competition between quantum-liquid and electron-solid phases in intermediate Landau levels
• Evidence of a first order phase transition between Wigner crystal and Bubble Phases of 2D electrons in higher Landau levels

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