Fig. 2
From: Excitations in the field-induced quantum spin liquid state of α-RuCl3
Field and temperature dependence of INS along (H, 0, 0): Data obtained on a 740 mg single crystal α-RuCl3 using the HYSPEC chopper spectrometer with Ei = 17 meV (see Methods). a–e Measurements at T = 2 K with an external field applied along the ζ= (−1, 2, 0) direction (perpendicular to (H, 0, 0)) using a Fermi chopper frequency of 240 Hz. The field strengths are a 0 T, b 2 T, c 4 T, d 6 T, and e 8 T. The slices shown are integrated over ranges Δζ = [−0.05, 0.05] (in units of 2.1 Å−1, see Supplementary Fig. S1) and ΔL = [−2,2] (in units of 0.37 Å−1). The energy continuum at the Γ point is visible at all fields. The low-field data clearly shows the spin-wave spectrum along the (H, 0, 0) direction, with minima at the special points, Y-M-Γ-M-Y, of the 2D honeycomb BZ (see Fig. S1 for BZ definitions). f The zero-field spectrum at T = 15 K, using a Fermi chopper frequency of 120 Hz (see Methods)
