Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase transition from a composite fermion liquid to a Wigner solid in
  the lowest Landau level of ZnO   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 this type of behavior is a two-dimensional electron system in a
magnetic field, which evolves intricately through various gaseous, liquid and
solids phases governed by Coulomb interaction. Here we report on the
experimental observation of a phase transition between the Laughlin liquid of
composite fermions and the adjacent insulating phase of a magnetic
field-induced 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 phase further into the liquid
phase region. Our observations indicate the direct competition between a Wigner
solid and a Laughlin liquid both formed by composite particles rather than bare
electrons.

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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
16
The categories of this paper are: stat
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph