<p>If there is a chance you might want to switch in the future to engineering or somehow combine physics with engineering/applied physics, then I think Cornell would be best. Princeton is also strong. Harvard and Yale might not be good choices if you want to keep an engineering option.</p>
<p>Cornell is especially strong in low-temp physics, nuclear physics. astrophysics, nanoscience, (and perhaps other areas).</p>
<p>Cornell and Columbia have had the most physics Nobel winners among the Ivys (and I think in the entire US) who have actually done their award-winning work while at the university. However, I am not sure what that implies about the quality of undergraduate physics education today.</p>