Physics Department Presents A Condensed Matter Theory Seminar
Condensed Matter Theory:
Emergence of a Field-Drive U(1) Spin Liquid in the Kitaev Honeycomb Model
University of Cologne, Germany
In the field of quantum magnetism, the exactly solvable Kitaev honeycomb model serves as a paradigm for the fractionalization of spin degrees of freedom and the formation of Z_2 quantum spin liquids. In this talk, I will discuss the complete phase diagram of the model in an external magnetic field and focus on the emergence of a distinct gapless quantum spin liquid at intermediate field strengths. Analyzing a number of static, dynamical, and finite temperature quantities using numerical exact diagonalization techniques, I will present strong evidence that this phase exhibits gapless fermions coupled to a massless U(1) gauge field. The emergence of such a phase, via an Anderson-Higgs transition, can be naturally understood within the framework of fermionic partons.
Lastly, I will briefly discuss its stability in the presence of perturbations that naturally arise in spin-orbit entangled candidate materials.
Wednesday, March 20, 2019 at 4:00pm to 5:00pm
Dana Research Center, 114 Dana Research Center