Experimental realization of a 2D fractional quantum spin liquid
Coldea, R. · Tennant, D. A. · Tsvelik, A. M. · Tylczynski, Z.
Original · EN
The ground-state ordering and dynamics of the two-dimensional (2D) S=1/2 frustrated Heisenberg antiferromagnet Cs₂CuCl₄ is explored using neutron scattering in high magnetic fields. We find that the dynamic correlations show a highly dispersive continuum of excited states, characteristic of the RVB state, arising from pairs of S=1/2 spinons. Quantum renormalization factors for the excitation energies (1.65) and incommensuration (0.56) are large.
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