  In our study, we investigated bright solitons, dark solitons, and quantum
droplets in quasi-one-dimensional dipolar Bose gases, and further validated the
crossover and coexistence of quantum droplets and solitons using the
Lieb-Liniger energy within the framework of local density approximation.
Increasing the particle number transforms the bright dipolar soliton state into
a stable self-bound quantum droplet state, with further increases in leading to
a broader quantum droplet that enables the presence of dark solitons within it.
