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- W4313304670 abstract "Recent theoretical and experimental work suggest that the honeycomb cobaltates, initially proposed as candidate Kitaev quantum magnets, are in fact described by a pseudospin-$1/2$ easy-plane spin Hamiltonian with nearest neighbor ferromagnetic (FM) exchange $J_1$ being frustrated by antiferromagnetic third-neighbor exchange $J_3$ and weaker compass anisotropies. Using exact diagonalization and density-matrix renormalization group (DMRG) calculations, we show that this model exhibits FM order at small $J_3/J_1$ and zig-zag (ZZ) order at large $J_3/J_1$, separated by an intermediate phase, which we label as {sl}. This {sl} phase is shown to exhibit spin-liquid-like correlations in DMRG, although we cannot preclude weak broken symmetries, e.g. weak Ising type N'eel order, given the limits on our explored system sizes. Using a modified parton mean field theory and variational Monte Carlo on Gutzwiller projected wavefunctions, we show that the optimal FM and ZZ orders as well as the intermediate {sl} state are proximate to a `parent' Dirac spin liquid (SL). This Dirac SL is shown to capture the broad continuum in the temperature and magnetic field dependent terahertz spectroscopy of {bcao}, and the reported low temperature metallic thermal conductivity in {ncto} and {bcao} upon incorporating disorder induced broadening." @default.
- W4313304670 created "2023-01-06" @default.
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- W4313304670 date "2022-12-26" @default.
- W4313304670 modified "2023-10-14" @default.
- W4313304670 title "Proximate Dirac spin liquid in honeycomb lattice $J_1$-$J_3$ XXZ model: Numerical study and application to cobaltates" @default.
- W4313304670 doi "https://doi.org/10.48550/arxiv.2212.13271" @default.
- W4313304670 hasPublicationYear "2022" @default.
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