Excitons in the Fractional Quantum Hall Effect

Abstract

Excitons, Coulomb-driven bound states of electrons and holes, are typically composed of integer charges. However, in bilayer systems influenced by charge fractionalization, a more exotic form of interlayer exciton can emerge, where pairing occurs between constituents that carry fractional charges. Despite numerous theoretical predictions for such fractional excitons, their experimental observation has remained elusive. Here, we report transport signatures of excitonic pairing within fractional quantum Hall effect states. By probing the composition of these excitons and their impact on the underlying wavefunction, we uncover two novel quantum phases of matter. One of these orders can be viewed as the fractional counterpart of the exciton condensate at a total filling of one, while the other involves a more unusual type of exciton that obeys fermionic and anyonic quantum statistics, challenging the standard paradigm of bosonic excitons.

9 pages for main text with 4 figures. In total of 24 pages and 15 figures

References in corpus (27)

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Cited by in corpus (8)

• Theory of Generalized Landau Levels and Implication for non-Abelian States
• Evidence for a Superfluid-to-solid Transition of Bilayer Excitons
• Exciton fractional Chern insulators in moiré heterostructures
• Localizing Individual Exciton on a Quantum Hall Antidot
• Interlayer-correlated fractional quantum Hall state in a trilayer electron system
• Interlayer exciton condensates between second Landau level orbitals in double bilayer graphene
• Time-dependent conserved operators for autonomous systems and quantization of resistance
• Correlated phases of moat-band excitons in two dimensions