Have you thought about going into the military? A quick google search brought me to this page http://www.careersinthemilitary.com/index.cfm?fuseaction=main.careerdetail&mc_id=101
I am sure someone else knows more about this, but I have heard of people joining the military after college for the benefit of having their student loans paid off.
Griswold, I have some more concrete suggestions for your career search, but let's address the military question first.
If you have even the slightest little bit of curiosity about the military, please take your physics degree and a copy of your transcript/grades to a Navy recruiter. You could be a nuclear-trained submarine officer, an aviator, or a surface warfare officer. Heck, you could even be a Marine artillery officer. But the submariners are willing to pay you a lot more money because physics graduates understand neutrons. I just mentored a physics graduate on this last year, and now he's reporting aboard his first submarine.
Post here or contact me if you have more questions about the military. The military won't pay off your student loans, but your starting salary will be over $3000/month (plus benefits) and you'll be eligible for Income-Based Repayment as well as Public Service Loan Forgiveness.
Now on to other concrete suggestions:
Get on Linkedin, update your profile and your resume, and search for Linkedin groups in the industries you'd like to join. Ask the members of those groups for networking interviews to help you decide on specific companies and career fields. Eventually you'll develop those initial contacts to widen your network to people working at those companies, and possibly even to the hiring managers. Use your university's alumni career offices for more contacts. Contact recruiters and headhunters in those Linkedin groups (if they don't contact you first). Find internships, part-time work, or even full-time work in the corporations/careers you want.
When you get hired, ask whether they can pay you a relocation allowance or a hiring bonus to accelerate the payments on your student loans.