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Macroscopically Degenerate Exactly Solvable Point in the Spin-1/2 Kagome Quantum Antiferromagnet

Hitesh J. Changlani, Dmitrii Kochkov, Krishna Kumar, Bryan K. Clark, and Eduardo Fradkin
Phys. Rev. Lett. 120, 117202 – Published 13 March 2018
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Abstract

Frustrated quantum magnets are a central theme in condensed matter physics due to the richness of their phase diagrams. They support a panoply of phases including various ordered states and topological phases. Yet, this problem has defied a solution for a long time due to the lack of controlled approximations which make it difficult to distinguish between competing phases. Here we report the discovery of a special quantum macroscopically degenerate point in the XXZ model on the spin-1/2 kagome quantum antiferromagnet for the ratio of Ising to antiferromagnetic transverse coupling Jz/J=1/2. This point is proximate to many competing phases explaining the source of the complexity of the phase diagram. We identify five phases near this point including both spin-liquid and broken-symmetry phases and give evidence that the kagome Heisenberg antiferromagnet is close to a transition between two phases.

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  • Received 10 December 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.117202

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hitesh J. Changlani1,2,3, Dmitrii Kochkov3, Krishna Kumar3, Bryan K. Clark3, and Eduardo Fradkin3

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 2Institute for Quantum Matter, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 3Department of Physics and Institute for Condensed Matter Theory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana Illinois 61801, USA

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Issue

Vol. 120, Iss. 11 — 16 March 2018

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