Figure 4
From: Kitaev exchange and field-induced quantum spin-liquid states in honeycomb α-RuCl3
Excitation spectrum, plaquette operator and entanglement spectrum for α-RuCl3.
(a) Energy spectrum Eν − E0 as a function of H (‖[001]) using the MRCI g factors and NN couplings plus J2 = J3 = 0.25 meV. Inset: 22-site cluster with OBC’s used in the ED calculations; the square indicates a target site to apply the spin-flip operator. (b) Expectation value of Oh as a function of H (‖[001]). Inset: labeling for the (hexagonal) plaquette operator Oh. (c) 〈Oh〉 vs φ plot for the plain NN Kitaev-Heisenberg model. (d) 44-site cylindrical cluster used in the DMRG calculation of entanglement spectra, with PBC’s for the vertical direction. (e) Resulting entanglement spectrum (H ‖ [001]); the off-diagonal NN couplings are set to 0 in the DMRG computations, J2 = J3 = 0.25.
