The problem is that most graduate schools (that is, the bureaucracy that *all* graduate departments belong to) require a 3.0 minimum gpa for admission. A few do not require this (Cornell, for example), but most do. 3.0 is sort of a bare minimum cutoff. If you can, I would really recommend taking a year and getting your GPA up with some grad classes and/or advanced physics and math classes. Even if it doesn't bring your gpa up above a 3.0, if you get A's it can show a committee that you are focused and capable now. What is your upper division physics GPA like? If if it is really good, you'll be in much better shape. It's just a shame that you are limited to a handful of programs right off the bat by the 3.0 requirements. Check http://www.gradschoolshopper.com
for requirements of different schools.