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Tunable fractional quantum Hall phases in bilayer graphene
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Journal Article
Tunable fractional quantum Hall phases in bilayer graphene
2014
Overview
Symmetry-breaking in a quantum system often leads to complex emergent
behavior. In bilayer graphene (BLG), an electric field applied
perpendicular to the basal plane breaks the inversion symmetry of the
lattice, opening a band gap at the charge neutrality point. In a
quantizing magnetic field, electron interactions can cause spontaneous
symmetry-breaking within the spin and valley degrees of freedom,
resulting in quantum Hall effect (QHE) states with complex order. Here,
we report fractional QHE states in BLG that show phase transitions that
can be tuned by a transverse electric field. This result provides a
model platform with which to study the role of symmetry-breaking in
emergent states with topological order.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
