  As amorphous materials get jammed, both geometric and dynamic heterogeneity
are observed. We investigate the correlation between the local geometric
heterogeneity and local rearrangements in a slowly compressed bidisperse
quasi-two-dimensional emulsion system. The compression is driven by evaporation
of the continuous phase, and causes the area packing fraction to increase from
0.88 to 0.99. We quantify the structural heterogeneity of the system using the
radical Voronoi tessellation following the method of [Rieser et al., Phys. Rev.
Lett. 116, 088001 (2016)]. We define two structural quantities characterizing
local structure, the first which considers nearest neighbors and the second of
which includes information from second nearest neighbors. We find that droplets
in heterogeneous local regions are more likely to have local rearrangements.
These rearrangements are generally T1 events where two droplets converge toward
a void, and two droplets move away from the void to make room for the
converging droplets. Thus the presence of the voids tends to orient the T1
events. The presence of a correlation between the structural quantities and the
rearrangement dynamics remains qualitatively unchanged over the entire range of
packing fractions observed.
