Numerical evidence for a chiral spin liquid in the XXZ antiferromagnetic Heisenberg model on the kagome lattice at magnetization
Abstract
In this work, we perform an exact-diagonalization study of the spin- XXZ Heisenberg antiferromagnet on the kagome lattice at finite magnetization with an emphasis on the point and in the presence of a small chiral term. Recent analytic work by Kumar et al. [K. Kumar, K. Sun, and E. Fradkin, Phys. Rev. B 90, 174409 (2014)] on the same model, using a newly developed flux attachment transformation, predicts a plateau at this value of the magnetization described by a chiral spin liquid (CSL) with a spin Hall conductance of . Such a state is topological in nature, has a ground-state degeneracy, and exhibits fractional excitations. We analyze the degeneracy structure in the low-energy manifold, identify the candidate topological states, and use them to compute the modular matrices and Chern numbers, all of which strongly agree with expected theoretical behavior for the CSL. In the limit of zero chirality, we find on most (not all) clusters that the topological invariants are still those of a CSL.
- Authors:
-
- Univ. of Illinois at Urbana-Champaign, IL (United States). Inst. for Condensed Matter Theory
- Publication Date:
- Research Org.:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1535771
- Alternate Identifier(s):
- OSTI ID: 1328589
- Grant/Contract Number:
- SC0008692; FG02-12ER46875; DMR 1408713; OCI-0725070; ACI-1238993
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 13; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; quantum spin liquid; topological phases of matter; Kagome lattice; exact diagonalization; Heisenberg model; XY model
Citation Formats
Kumar, Krishna, Changlani, Hitesh J., Clark, Bryan K., and Fradkin, Eduardo. Numerical evidence for a chiral spin liquid in the XXZ antiferromagnetic Heisenberg model on the kagome lattice at m=23 magnetization. United States: N. p., 2016.
Web. doi:10.1103/physrevb.94.134410.
Kumar, Krishna, Changlani, Hitesh J., Clark, Bryan K., & Fradkin, Eduardo. Numerical evidence for a chiral spin liquid in the XXZ antiferromagnetic Heisenberg model on the kagome lattice at m=23 magnetization. United States. https://doi.org/10.1103/physrevb.94.134410
Kumar, Krishna, Changlani, Hitesh J., Clark, Bryan K., and Fradkin, Eduardo. Mon .
"Numerical evidence for a chiral spin liquid in the XXZ antiferromagnetic Heisenberg model on the kagome lattice at m=23 magnetization". United States. https://doi.org/10.1103/physrevb.94.134410. https://www.osti.gov/servlets/purl/1535771.
@article{osti_1535771,
title = {Numerical evidence for a chiral spin liquid in the XXZ antiferromagnetic Heisenberg model on the kagome lattice at m=23 magnetization},
author = {Kumar, Krishna and Changlani, Hitesh J. and Clark, Bryan K. and Fradkin, Eduardo},
abstractNote = {In this work, we perform an exact-diagonalization study of the spin-12 XXZ Heisenberg antiferromagnet on the kagome lattice at finite magnetization m=23 with an emphasis on the XY point (Jz=0) and in the presence of a small chiral term. Recent analytic work by Kumar et al. [K. Kumar, K. Sun, and E. Fradkin, Phys. Rev. B 90, 174409 (2014)] on the same model, using a newly developed flux attachment transformation, predicts a plateau at this value of the magnetization described by a chiral spin liquid (CSL) with a spin Hall conductance of σxy=12. Such a state is topological in nature, has a ground-state degeneracy, and exhibits fractional excitations. We analyze the degeneracy structure in the low-energy manifold, identify the candidate topological states, and use them to compute the modular matrices and Chern numbers, all of which strongly agree with expected theoretical behavior for the σxy=12 CSL. In the limit of zero chirality, we find on most (not all) clusters that the topological invariants are still those of a CSL.},
doi = {10.1103/physrevb.94.134410},
journal = {Physical Review B},
number = 13,
volume = 94,
place = {United States},
year = {Mon Oct 10 00:00:00 EDT 2016},
month = {Mon Oct 10 00:00:00 EDT 2016}
}
Web of Science
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