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Journal Article

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


Falson,  J.
Max Planck Society;

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Maryenko, D., McCollam, A., Falson, J., Kozuka, Y., Bruin, J., Zeitler, U., et al. (2018). Composite fermion liquid to Wigner solid transition in the lowest Landau level of zinc oxide. Nature Communications, 9: 4356.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D9E4-C
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.