Barkeshli, M, Nayak, C, Papić, Z et al. (2 more authors) (2018) Topological exciton Fermi surfaces in two-component fractional quantized Hall insulators. Physical Review Letters, 121 (2). ISSN 0031-9007
Abstract
A wide variety of two-dimensional electron systems (2DES) allow for independent control of the total andrelative charge density of two-component fractional quantum Hall (FQH) states. In particular, a recent experimenton bilayer graphene (BLG) observed a continuous transition between a compressible and incompressiblephase at total filling νT =12as charge is transferred between the layers, with the remarkable property that theincompressible phase has a finite interlayer polarizability. We argue that this occurs because the topologicalorder of νT =12systems supports a novel type of interlayer exciton that carries Fermi statistics. If the fermionicexcitons are lower in energy than the conventional bosonic excitons (i.e., electron-hole pairs), they can form anemergent neutral Fermi surface, providing a possible explanation of an incompressible yet polarizable state atνT =12. We perform exact diagonalization studies which demonstrate that fermionic excitons are indeed lowerin energy than bosonic excitons. This suggests that a “topological exciton metal” hidden inside a FQH insulatormay have been realized experimentally in BLG. We discuss several detection schemes by which the topologicalexciton metal can be experimentally probed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 American Physical Society. This is an author produced version of a paper published in Physical Review Letters. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 16 May 2018 08:59 |
Last Modified: | 12 Jul 2018 14:58 |
Published Version: | https://journals.aps.org/prl/accepted/c5072Yc5M7a1... |
Status: | Published |
Publisher: | American Physical Society |
Identification Number: | 10.1103/PhysRevLett.121.026603 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:114651 |