Fractional Quantum Hall Phase Transitions and Four-Flux States in Graphene

Feldman, B. E.; Levin, A. J.; Krauss, B.; Abanin, D. A.; Halperin, B. I.; Smet, J. H.; Yacoby, A.

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Fractional Quantum Hall Phase Transitions and Four-Flux States in Graphene

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Krauss, B.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Research Group Solid State Nanophysics (Jurgen H. Smet), Max Planck Institute for Solid State Research, Max Planck Society;

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Smet, J. H.
Abteilung v. Klitzing, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Research Group Solid State Nanophysics (Jurgen H. Smet), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Feldman, B. E., Levin, A. J., Krauss, B., Abanin, D. A., Halperin, B. I., Smet, J. H., et al. (2013). Fractional Quantum Hall Phase Transitions and Four-Flux States in Graphene. Physical Review Letters, 111(7): 076802.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C78F-1

Abstract

Graphene and its multilayers have attracted considerable interest because their fourfold spin and valley degeneracy enables a rich variety of broken-symmetry states arising from electron-electron interactions, and raises the prospect of controlled phase transitions among them. Here we report local electronic compressibility measurements of ultraclean suspended graphene that reveal a multitude of fractional quantum Hall states surrounding filling factors nu = -1/2 and -1/4. Several of these states exhibit phase transitions that indicate abrupt changes in the underlying order, and we observe many additional oscillations in compressibility as nu approaches -1/2, suggesting further changes in spin and/or valley polarization. We use a simple model based on crossing Landau levels of composite fermions with different internal degrees of freedom to explain many qualitative features of the experimental data. Our results add to the diverse array of many-body states observed in graphene and demonstrate substantial control over their order parameters.