I don't know much about MIT and Stanford, but given your interests, you may also want to try UCSB (assuming you haven't applied to schools already). In particular, Anthony Zee comes to mind, as he does work in the applications of quantum field theory to condensed matter physics.
If you're also interested in where ideas from particle physics can take you in condensed matter physics, you can take a look at Princeton. There, Christopher Herzog is working on applications of the gauge/gravity duality in studying high temperature superconductors!
In any case, I'd recommend looking at the research profiles of the condensed matter faculty members of the schools you applied to, and see which one best fits your research interests. If there's a faculty member who you want to work with, you should contact them and ask them about their research and whether they can take on new grad students.