Supersolid phase induced by correlated hopping in spin-1/2 frustrated quantum magnets

Details Supersolid phase induced by correlated hopping in spin-1/2 frustrated quantum magnets Supersolid phase induced by correlated hopping in spin-1/2 frustrated quantum magnets

2007-06-11

arxiv.org/abs/0706.1517v3

Physical Review Letters 100, 090401 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages; 4 figures; published version

Scientific paper

10.1103/PhysRevLett.100.090401

We show that correlated hopping of triplets, which is often the dominant source of kinetic energy in dimer-based frustrated quantum magnets, produces a remarkably strong tendency to form supersolid phases in a magnetic field. These phases are characterized by simultaneous modulation and ordering of the longitudinal and transverse magnetization respectively. Using Quantum Monte Carlo and a semiclassical approach for an effective hard-core boson model with nearest-neighbor repulsion on a square lattice, we prove in particular that a supersolid phase can exist even if the repulsion is not strong enough to stabilize an insulating phase at half-filling. Experimental implications for frustrated quantum antiferromagnets in a magnetic field at zero and finite temperature are discussed.

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