Kavli Affiliate: Gang Su
| First 5 Authors: Han Li, Han Li, , ,
| Summary:
The realization of quantum spin liquids (QSLs) in Kitaev magnets represents
an intriguing topic in frustrated quantum magnetism. Despite prediction in the
pure Kitaev honeycomb model, realization of QSLs in realistic systems and
materials remain scarce. The recent discovery of cobalt-based compound
Na$_2$Co$_2$TeO$_6$ has raised significant research interest. By establishing a
realistic $K$-$J$-$Gamma$-$Gamma’$ model for Na$_2$Co$_2$TeO$_6$ — with a
dominant antiferromagnetic (AFM) Kitaev interaction ($K>0$) that quantitatively
explains its thermodynamics measurements — we reveal an intermediate gapless
QSL phase under [111] magnetic fields with tensor-network calculations. We
confirm the QSL nature of this phase by demonstrating its adiabatic connection
to the intensively studied intermediate QSL of the pure AFM Kitaev model under
out-of-plane fields. Our results show excellent agreement with recent
high-field experiments, thereby explaining the intermediate-field phase in
Na$_2$Co$_2$TeO$_6$. These findings bridge the gap between theoretical
proposals for a Kitaev-derived QSL and experimental realization, opening new
avenues for exploring exotic quantum states of matter in realistic Kitaev
materials.
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