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I'm getting to the end of my final undergraduate course on quantum mechanics, which basically covered time dependent/independent perturbation theory and the fine structure of atoms. As I still have some time until graduate school, I'd like to continue studying quantum mechanics on my own and I'm not quite sure what's next. I'm guessing quantum field theory or relativistic quantum mechanics is the "next step" and I was wondering what textbooks would be recommended for self-study. The graduate courses use Sakurai's Modern Quantum Mechanics for the first semester, which seems to be the same material covered in my undergrad courses, but probably at a more advanced level, and then Merzbacher's Quantum Mechanics and some other books for reference for the second semester, which looks like it covers creation/annihilation operators and relativistic quantum mechanics.