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

Hitesh J. Changlani, Dmitrii Kochkov, Krishna Kumar, Bryan K. Clark, Eduardo Fradkin

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Article number117202
JournalPhysical review letters
Volume120
Issue number11
DOIs
StatePublished - Mar 13 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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