Resonating valence bond wave function for the two dimensional fractional spin liquid

Details Resonating valence bond wave function for the two dimensional fractional spin liquid Resonating valence bond wave function for the two dimensional fractional spin liquid

2003-08-13

arxiv.org/abs/cond-mat/0308252v2

Phys. Rev. Lett. 92, 157003 (2004).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.157003

The unconventional low-lying spin excitations, recently observed in neutron scattering experiments on ${\rm Cs_2 Cu Cl_4}$, are explained with a spin liquid wave function. The dispersion relation as well as the wave vector of the incommensurate spin correlations are well reproduced within a projected BCS wave function with gapless and fractionalized spin-1/2 excitations around the nodes of the BCS gap function. The proposed wave function is shown to be very accurate for one-dimensional spin-1/2 systems, and remains similarly accurate in the two-dimensional model corresponding to ${\rm Cs_2 Cu Cl_4}$, thus representing a good ansatz for describing spin fractionalization in two dimensions.

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