Quantum magnets provide the simplest example of strongly interacting quantum matter, yet they continue to resist a comprehensive understanding in D>1+1 dimensions. Here we argue that in two spatial dimensions (D=2+1) the Dirac spin liquid (DSL), a version of Quantum Electrodynamics (QED3) provides a promising unifying description of quantum magnets on various lattices. In addition to photons and Dirac fermions (spinons), its excitations also include magnetic monopoles that drive confinement. By calculating the complete action of symmetries on monopoles on different lattices, we address previously open key questions including the stability and experimental/numerical signatures of these states and their nearby ordered phases. Time permitting, I will explain how the monopole quantum numbers are simply related to topological properties of the spinon bands.
Seminar
Speaker
Ashvin Vishwanath (Harvard University, USA)
Date & Time
Thu, 27 December 2018, 11:00 to 12:30
Venue
Emmy Noether Seminar Room, ICTS Campus, Bangalore
Resources
Abstract