Thermoelectric response of fractional quantized Hall and re-entrant insulating states in the N=1 Landau level

Abstract

Detailed measurements of the longitudinal thermopower of two-dimensional electrons in the first excited Landau level are reported. Clear signatures of numerous fractional quantized Hall states, including those at $\nu =5/2$ and 7/3, are observed in the magnetic field and temperature dependence of the thermopower. An abrupt collapse of the thermopower is observed below about $T=40$ mK at those filling factors where re-entrant insulating electronic states have been observed in conventional resistive transport studies. The thermopower observed at $\nu =5/2$ is discussed in the context of recent theories which incorporate non-abelian quasiparticle exchange statistics.

5 pages, 5 figures

References in corpus (5)

• Experimental studies of the fractional quantum Hall effect in the first excited Landau level
• Tilt-Induced Anisotropic to Isotropic Phase Transition at $\nu =5/2$
• Thermopower as a Possible Probe of Non-Abelian Quasiparticle Statistics in Fractional Quantum Hall Liquids
• Contrasting Behavior of the 5/2 and 7/3 Fractional Quantum Hall Effect in a Tilted Field
• Thermopower of Quantum Hall States in Corbino Geometry as a Measure of Quasiparticle Entropy

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• Electron-Hole Asymmetric Chiral Breakdown of Reentrant Quantum Hall States
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• Heat conductance oscillations in two weakly connected charge Kondo circuits
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