  Much effort has been devoted to the electronic properties of relatively thick
ZrTe5 crystals, focusing on their three-dimensional topological effects. Thin
ZrTe5 crystals, on the other hand, were much less explored experimentally. Here
we present detailed magnetotransport studies of few-layer ZrTe5 devices, in
which electron-electron interactions and weak anti-localization are observed.
The coexistence of the two effects manifests themselves in corroborating
evidence presented in the temperature and magnetic field dependence of the
resistance. Notably, the temperature-dependent phase coherence length extracted
from weak anti-localization agrees with strong electron-electron scattering in
the sample. Meanwhile, universal conductance fluctuations have temperature and
gate voltage dependence that is similar to that of the phase coherence length.
Lastly, all the transport properties in thin ZrTe5 crystals show strong
two-dimensional characteristics. Our results provide new insight into the
highly intricate properties of topological material ZrTe5.
