Condensed matter physics is the largest sub-discipline of Physics, and deals quite generally with the physical properties of matter in its "condensed" phase. Such condensed phases include the familiar liquids and solids, in addition to more exotic phases such as super-fluids and Bose-Einstein condensates, which are purely quantum-mechanical in origin.
For more information on the various topics covered by condensed matter physics, you may wish to visit the Wikipedia Condensed Matter Physics page.
Owing to its large scope, the majority of physics faculty members at StFX fall under the condensed matter physics umbrella. Department members working on condensed matter physics are: