There is a PhD project advertised by a professor and I want to avail that position. But that project is not clearly connected with my work in my MS research. (Advertised project is about quantum liquids while my MS work is about topological insulators). However, I know basics of quantum liquids and I find myself very much interested in this field.
Is it a good idea to mention that my work is not connected with this project but my very strong interest in this field is what motivating me to apply for this position in the motivation letter?