  The spinon continues to be an elusive elementary excitation of frustrated
antiferromagnets. To solidify evidence for its existence, we address the
question of what will be the Angle Resolved Photoemission Spectroscopy (ARPES)
signatures of single crystal samples of Herbertsmithite assuming it is
described by the Dirac spin liquid state. In particular, we show that the
electron spectral function will have a linear in energy dependence near
specific wave vectors and that this dependence is expected even after
fluctuations to the mean field values are taken into account. Observation of
this unique signature in ARPES will provide very strong evidence for the
existence of spinons in greater than one dimension.
