Extended Data Figure 5: Calculation of the zero-flux Hamiltonian.
From: Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate
a, Spinon dispersion ωk of the zero-flux Hamiltonian. The grey plane marks the Fermi level at ω = 0; its intersection with the band gives the Fermi surface. The light orange hexagon represents the projection of the first Brillouin zone. The maximum of ωk is 3t and the minimum is −6t, providing a bandwidth of 9t. b, Calculated dynamic spin structure factor along high-symmetry directions. A reciprocal lattice unit (r.l.u.) is used here, which is obtained using 
and 
. c, Measured spin excitation spectrum along high-symmetry directions at 70 mK. d, Calculated energy dispersion at the indicated momenta (marked by arrows in b). e, Measured constant-Q scans at the indicated momenta. The dashed line is the incoherent elastic line for Ef = 4 meV.
