This article reviews experimental and theoretical work on Bose-Einstein condensation in
quantum magnets. These magnets are natural realizations of gases of interacting bosons …

We establish compelling evidence for the existence of new quasi-one-dimensional
descendants of the d-wave Bose liquid (DBL), an exotic two-dimensional quantum phase of …

Motivated by some inconsistencies in the way quantum fluctuations are included beyond the
classical treatment of hard-core bosons on a lattice in the recent literature, we revisit the …

We study the zero-temperature phase diagram of two-dimensional hard-core bosons on a
square lattice with nearest-neighbor and plaquette (ring-exchange) hoppings, at arbitrary …

We present the analysis of the slowing down exhibited by stochastic dynamics of a ring-
exchange model on a square lattice, by means of numerical simulations. We find the …

We study the effect of Dzyaloshisnkii–Moriya interaction on spin transport in the two and
three-dimensional Heisenberg antiferromagnetic models in the square lattice and cubic …

The effect of nonmagnetic disorder on Berezinskii-Kosterlitz-Thouless (BKT) transition in the
two-dimensional ferromagnetic XY model on a square lattice, diluted by randomly placed …

We present the linear spin wave theory calculation of the superfluid phase of a hard-core
boson JK model with nearest neighbour exchange J and four-particle ring-exchange K at …

In this thesis we take several different analytic and numerical approaches to studying the
classical JK model. This model describes an interacting many-body system of spins with …

In this paper, we apply spin-wave theory to the one-dimensional spin-1/2 ferromagnetic XY
model with the next-nearest neighbor interaction. The thermodynamic divergences which …