Main reference: Donoghue and Sorbo, A Prelude to Quantum Field Theory
Complementary references:
Zamolodchikov lecture notes (first 4 lectures)
Peskin and Schroeder, An Introduction to Quantum Field Theory (first 5 chapters)
Altland and Simons, Condensed Matter Field Theory (chapters 2, 4, 7)
Presentation topics:
Hawking radiation (ref: Ford's lectures 1&2 in https://arxiv.org/pdf/gr-qc/9707062)
Emission and absorption of radiation by atoms (ref: chapter 4 of Gerry and Knight, Introductory Quantum Optics)