Figure 3: INS results in an external magnetic field. | Nature Communications

Figure 3: INS results in an external magnetic field.

From: Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet

Figure 3

False-colour maps of the excitation spectra as a function of energy and wave-vector transfer along the (H, H, −0.5) and (0.5, 0.5, −L) directions measured at T=0.1 K and (a,b) μ0H=0, (c,d) μ0H=4 T, (e,f) μ0H=6 T and (g,h) μ0H=10 T. Intensity at 10 T was enlarged by a factor of 3 to increase the contrast. Circle points represent the position of maximum intensity at each wave-vector. The white arrows indicate renormalization of the TMhigh mode. The red arrows indicate the experimental evidence of the TMlow mode. Red and yellow lines are the linear spin–wave theory calculations of the acoustic TMhigh and TMlow one-magnon dispersion, respectively. Grey lines are the calculated lower boundary of the two-magnon continuum as described in the Methods section.

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