The unconventional low-lying spin excitations, recently observed in neutron scattering experiments on Cs2CuCl4, 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 Cs2CuCl4, thus representing a good ansatz for describing spin fractionalization in two dimensions.

Resonating valence bond wave function for the two-dimensional fractional spin liquid / Yunoki, S; Sorella, Sandro. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 92:15(2004), pp. 1-4. [10.1103/PhysRevLett.92.157003]

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

Sorella, Sandro
2004-01-01

Abstract

The unconventional low-lying spin excitations, recently observed in neutron scattering experiments on Cs2CuCl4, 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 Cs2CuCl4, thus representing a good ansatz for describing spin fractionalization in two dimensions.
2004
92
15
1
4
140403
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.92.157003
https://arxiv.org/abs/cond-mat/0308252
Yunoki, S; Sorella, Sandro
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/12583
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