Quantum Coherence Controlled by Light: From Higgs Bosons to Chiral Fermions
Department of Physics & Astronomy and Ames Laboratory-U.S. DOE, Iowa State University, Ames, IA 50011, USA
Revolutionary properties of complex systems are often manifestations of quantum coherence, e.g. it exists between the Cooper pairs in high-temperature superconductors (SCs); it protects chiral charge transport from disorder scattering in topological states of matter (TSM). The recent development of coherent spectroscopy tools facilitates discovering and understanding driven quantum systems involving SCs and TSM controlled by light. In this talk, I will discuss strategic advantages, with recent examples, of implementing this approach to probe and control some most fundamental coherent phenomena in quantum many-body systems and topological states, e.g., hidden quantum fluid with singular transport, light-induced gapless superconductivity, forbidden high harmonic quantum oscillations and Higgs modes, and coherent phonon controlled topology switching and chiral charge pumping…. We argue that the light-driven coherence and dynamic symmetry breaking revealed are universal principles that can be extended to achieve non-equilibrium materials discovery and quantum control.