  Chiral condensed matter systems, such as liquid crystals and magnets, exhibit
a host of spatially localized topological structures that emerge from the
medium's tendency to twist and its competition with confinement and field
coupling effects. We show that the strength of perpendicular surface boundary
conditions can be used to control the structure and topology of solitonic and
other localized field configurations. By combining numerical modeling and
three-dimensional imaging of the director field, we reveal structural stability
diagrams and inter-transformation of twisted walls and fingers, torons and
skyrmions and their crystalline organizations upon changing boundary
conditions. Our findings provide a recipe for controllably realizing skyrmions,
torons and hybrid solitonic structures possessing features of both of them,
which will aid in fundamental explorations and technological uses of such
topological solitons. Moreover, we discuss how other material parameters can be
used to determine soliton stability, and how similar principles can be
systematically applied to other liquid crystal solitons, and solitons in other
material systems.

Soft Condensed Matter