Milovanovic, MV, Dobardzic, E and Papic, Z (2015) Meron deconfinement in the quantum Hall bilayer at intermediate distances. Physical Review B, 92 (19). 195311. ISSN 1098-0121
Abstract
Quantum Hall bilayer phase diagram with respect to interlayer distance bears a remarkable similarity with phase diagrams of strongly correlated systems as a function of doping, with magnetic ordering on the one end and Fermi-liquid-like behavior on the other. Moreover, it has been suggested [Phys. Rev. Lett. 101, 176803 (2008)] that a BCS correlated state of composite fermions with p-wave pairing may exist in the intermediate region. In the same region, an exact diagonalization study in the torus geometry [Phys. Rev. B 69, 045319 (2004)] pointed out the existence of state(s) with pseudospin spiraling order. Here we reconcile these two descriptions of the intermediate state by considering the underlying bosonic representation of the composite fermion paired state in the long-distance limit, and by performing extensive exact diagonalizations on the torus. We argue that the spiraling states belong to the manifold of degenerate ground state(s), and are a consequence of Bose condensation of the quasiparticles (with critical algebraic correlations) at nonzero momenta in the two pseudospin states. The spiraling states, generated in this way as spin textures, can be identified with meron-antimeron constructions. Thus, merons—the fractionally charged vortex excitations of the XY magnetically ordered state—constitute some of the topological sectors. It follows that merons are deconfined in the intermediate state, and allow for a smooth transition between the magnetically ordered and Fermi-liquid-like phases, in which they are bound in pairs.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015, American Physical Society. This is an author produced version of a paper published in Physical Review B. 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) > Theoretical Physics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Jan 2016 12:48 |
Last Modified: | 17 Apr 2017 14:59 |
Published Version: | http://dx.doi.org/10.1103/PhysRevB.92.195311 |
Status: | Published |
Publisher: | American Physical Society |
Identification Number: | 10.1103/PhysRevB.92.195311 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:93918 |