A review of theoretical and experimental evidence that Kitaev magnets exhibit thermal fractionalization into Majorana fermions and Z2 fluxes, with the half-quantized thermal Hall effect as the strongest proposed signature.
Weak-field induced nonmagnetic state in a Co-based honeycomb
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abstract
Layered honeycomb magnets are of interest as potential realizations of the Kitaev quantum spin liquid (KQSL), a quantum state with long-range spin entanglement and an exactly solvable Hamiltonian. Conventional magnetically ordered states are present for all currently known candidate materials, however, because non-Kitaev terms in the Hamiltonians obscure the Kitaev physics. Current experimental studies of the KQSL are focused on 4d- or 5d-transition-metal-based honeycombs, in which strong spin-orbit coupling can be expected, yielding Kitaev interaction that dominate in an applied magnetic field. In contrast, for 3d-based layered honeycomb magnets, spin orbit coupling is weak and thus Kitaev-physics should be substantially less accessible. Here we report our studies on BaCo2(AsO4)2, for which we find that the magnetic order associated with the non-Kitaev interactions can be fully suppressed by a relatively low magnetic field, yielding a non-magnetic material and implying the presence of strong magnetic frustration and weak non-Kitaev interactions.
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cond-mat.str-el 1years
2019 1verdicts
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Hunting Majorana Fermions in Kitaev Magnets
A review of theoretical and experimental evidence that Kitaev magnets exhibit thermal fractionalization into Majorana fermions and Z2 fluxes, with the half-quantized thermal Hall effect as the strongest proposed signature.