Comment on “Linear Wave Dynamics Explains Observations Attributed to Dark Solitons in a Polariton Quantum Fluid”

Figure 1

(a) Experimentally reported solitons [2] and, (b) interference patterns [1]. (c) Measured full width at half maximum (FWHM) of the density dips in (b), and expected width $w$ from the soliton equations, obtained from the measured local density $n$ using the relation $w=C{n}^{-1/2}$ (with $C$ a fitting parameter); data analysis is in Ref. [1]. (d) Same as (c) for the soliton case reported in (a), following the same criteria to extract the FWHM.