Theoretical Physics Seminar: Matthias Gohlke
This is the 22nd biweekly session of the OIST Theoretical Physics Seminar.
In this seminar series, we pretend to have a theoretical physics department, and tell each other informal stories over drinks and snacks.
Speaker: Matthias Gohlke (Quantum what's the Matter).
Title: "Kitaev's honeycomb model: an exactly solvable quantum spin liquid"
The Kitaev model  is a model of spin-1/2 constituents on the
honeycomb lattice subject to bond-dependent Ising exchange. It exhibits
a quantum spin liquid ground state with fractionalization of the spins
into itinerant Majorana fermions coupled to a static Z2 gauge field.
Recently, there has been a surge of interest in the Kitaev model due to
possible realization of its exchange interactions in real materials.
I'll start by shortly introducing quantum spin liquids in general and
why condensed matter physicist care. Then I will present the Kitaev
model and sketch its exact solution. If time permits, I will also
explain how the Kitaev exchange is realized in materials.
 A. Kitaev, Ann. Phys. (NY) 321, 2 (2006)