Majorana fermions and half-integer thermal quantum Hall effect in a quantum magnet

When topology is combined with strong electron correlations, exotic phenomena can arise. One of the most prominent example is the fractional quantum Hall effect, in which the constituent particles are electrons but the quasiparticles carry fractions of the electron charge. Recently, Kitaev quantum spin liquid (QSL) has aroused a great interest, because exotic quasiparticles, such as Majorana fermions and non-Abelian anyons, emerge as a result of fractionalization of electron spins. Kitaev model represents a spin-1/2 on a honeycomb lattice interacting through bond-dependent Ising ferromagnetic couplings.

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