  Much of the dramatic growth in research on topological materials has focused
on topologically protected surface states. While the domain walls of
topological materials such as Weyl semimetals with broken inversion or
time-reversal symmetry can provide a hunting ground for exploring topological
interfacial states, such investigations have received little attention to date.
Here, utilizing in-situ cryogenic transmission electron microscopy combined
with first-principles calculations, we discover intriguing domain-wall
structures in MoTe2, both between polar variants of the low-temperature(T) Weyl
phase, and between this and the high-T high-order topological phase. We
demonstrate how polar domain walls can be manipulated with electron beams and
show that phase domain walls tend to form superlattice-like structures along
the c axis. Scanning tunneling microscopy indicates a possible signature of a
conducting hinge state at phase domain walls. Our results open avenues for
investigating topological interfacial states and unveiling multifunctional
aspects of domain walls in topological materials.
