Composite fermion liquid to Wigner solid transition in the lowest Landau level of zinc oxide

D. Maryenko (), A. McCollam, J. Falson, Y. Kozuka, J. Bruin, U. Zeitler and M. Kawasaki
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D. Maryenko: RIKEN Center for Emergent Matter Science (CEMS)
A. McCollam: Radboud University
J. Falson: The University of Tokyo
Y. Kozuka: The University of Tokyo
J. Bruin: Radboud University
U. Zeitler: Radboud University
M. Kawasaki: RIKEN Center for Emergent Matter Science (CEMS)

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Interactions between the constituents of a condensed matter system can drive it through a plethora of different phases due to many-body effects. A prominent platform for it is a dilute two-dimensional electron system in a magnetic field, which evolves intricately through various gaseous, liquid and solid phases governed by Coulomb interaction. Here we report on the experimental observation of a phase transition between the composite fermion liquid and adjacent magnetic field induced phase with a character of Wigner solid. The experiments are performed in the lowest Landau level of a MgZnO/ZnO two-dimensional electron system with attributes of both a liquid and a solid. An in-plane magnetic field component applied on top of the perpendicular magnetic field extends the Wigner-like phase further into the composite fermion liquid phase region. Our observations indicate the direct competition between a composite fermion liquid and a Wigner solid formed either by electrons or composite fermions.

Date: 2018
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DOI: 10.1038/s41467-018-06834-6

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