Cristian Batista

Los Alamos National Lab

Field-induced supersolid in spin-1 Heisenberg models

Theoretical proposals for studying the Bose-Einstein condensation with magnetic systems were followed by a vast number of experimental works. These studies were typically done on spin dimer compounds. Magnetic systems have the advantage that the magnetic field, which plays role of a chemical potential, can be varied continuously over a large range of values. A natural question that arises is if other phases that have been proposed for bosonic gases of atoms can be realized in quantum magnets. The supersolid state is a prominent and interesting example because the experimental evidence for this novel phase is still inconclusive.  By using a combination of analytical and numerical approaches, I will show that different and simple spin one Heisenberg models contain a supersolid phase in their quantum phase diagrams. The spin SS phase is induced by application of a magnetic field whose Zeeman splitting is comparable to the magnitude of the exchange interactions. I will also discuss some alternative ways of finding a spin supersolid in real materials.