Emergent Phenomena Induced by Quantum Fluctuation
Shanghai Jiao Tong University, China
Condensed matter systems are most interesting because their rich emergent
phenomena that often can go against the simple rules thumbs derived from standard
models. In this talk, I will introduce a poor man’s illustration of the concept of
emergence. As an example, I will discuss our recent study of the rich magnetic and
orbital ordering in the Fe-based high-temperature superconductors, and demonstrate
a counter-intuitive phenomenon that a larger spin actually fluctuate stronger in the
presence of itinerant carriers. This talk will also clarify the relation between
the structural (orbital) order and the magnetic order. Finally, we point out an occurrence
of correlated metals in such mixed local/non-local systems.