期刊
PHYSICAL REVIEW B
卷 99, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.165126
关键词
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资金
- National Science Foundation [DMR-1664842]
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research and Innovation
- Cenovus Energy at Perimeter Institute
- German National Academy of Sciences Leopoldina [LPDS 2016-12]
- ERC synergy grant UQUAM
Motivated by recent transport measurements in high-T-c cuprate superconductors in a magnetic field, we study the thermal Hall conductivity in materials with topological order, focusing on the contribution from neutral spinons. Specifically, different Schwinger boson mean-field Ansatze for the Heisenberg antiferromagnet on the square lattice are analyzed. We allow for both Dzyaloshinskii-Moriya interactions, and additional terms associated with scalar spin chiralities that break time-reversal and reflection symmetries, but preserve their product. It is shown that these scalar spin chiralities, which can either arise spontaneously or are induced by the orbital coupling of the magnetic field, can lead to spinon bands with nontrivial Chern numbers and significantly enhanced thermal Hall conductivity. Associated states with zero-temperature magnetic order, which is thermally fluctuating at any T > 0, also show a similarly enhanced thermal Hall conductivity.
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