Yang Chen-Ning
In the same year, as a second-year student, Yang passed the entrance examination and studied at National Southwestern Associated University.He received a Bachelor of Science in 1942,[2] with his thesis on the application of group theory to molecular spectra, under the supervision of Ta-You Wu.Yang continued to study graduate courses there for two years under the supervision of Wang Zhuxi, working on statistical mechanics.His departure for the United States was delayed for one year, during which time he taught in a middle school as a teacher and studied field theory.In 1949 he was invited to do his research at the Institute for Advanced Study in Princeton, New Jersey, where he began a period of fruitful collaboration with Tsung-Dao Lee.After retiring from Stony Brook, he returned as an honorary director of Tsinghua University, Beijing, where he is the Huang Jibei-Lu Kaiqun Professor at the Center for Advanced Study (CASTU).At the University of Chicago, Yang first spent twenty months working in an accelerator lab, but he later found he was not as good as an experimentalist and switched back to theory.Lee proposed that in the weak interaction the parity symmetry was not conserved, Chien-shiung Wu's team at the National Bureau of Standards in Washington experimentally verified the theory.He studied the theory of phase transition and elucidated the Lee–Yang circle theorem, properties of quantum boson liquid, two dimensional Ising model, flux quantization in superconductors (with N. Byers, 1961), and proposed the concept of Off-Diagonal Long-Range Order (ODLRO, 1962).