  We study dynamical quantum phase transitions (DQPTs) in the extended
Bose-Hubbard model after a sudden quench of the nearest-neighbor interaction
strength. Using the time-dependent density matrix renormalization group, we
demonstrate that interaction-driven DQPTs can appear after quenches between two
topologically trivial insulating phases -- a phenomenon that has so far only
been studied between gapped and gapless phases. These DQPTs occur when the
interaction strength crosses a certain threshold value that does not coincide
with the equilibrium phase boundaries, which is in contrast to quenches that
involve a change of topology. In order to elucidate the nonequilibrium
excitations during the time evolution, we define a new set of string and parity
order parameters. We find a close connection between DQPTs and these newly
defined order parameters for both types of quenches. In the interaction-driven
case, the order parameter exhibits a singularity at the time of the DQPT only
when the quench parameter is close to the threshold value. Finally, the
timescales of DQPTs are scrutinized and different kinds of power laws are
revealed for the topological and interaction-driven cases.

Quantum Gases