The S= 1/2 square-lattice JQ model hosts a deconfined quantum phase transition between
antiferromagnetic and dimerized (valence-bond solid) ground states. We here study two …

Using the density-matrix renormalization group method for the ground state and excitations
of the Shastry-Sutherland spin model, we demonstrate the existence of a narrow quantum …

We introduce a quantum spin-1/2 model with many-body correlated Heisenberg-type
interactions on the two-dimensional square lattice, designed so that the system can host a …

Duality places an important constraint on the renormalization group flows and the phase
diagrams. For self-dual theories, the self-duality can be promoted as a symmetry, this leads …

We resolve the nature of the quantum phase transition between a N\'eel antiferromagnet and
a valence-bond solid in two-dimensional spin-1/2 magnets. We study a class of $ J $-$ Q …

Recent experiments [Guo et al., Phys. Rev. Lett. 124 206602 (2020)] on thermodynamic
properties of the frustrated layered quantum magnet SrCu 2 (BO 3) 2—the Shastry …

We study the critical scaling and dynamical signatures of fractionalized excitations at two
different deconfined quantum critical points (DQCPs) in an S= 1/2 spin chain using the time …

Abstract By using quantum Monte Carlo based stochastic analytic continuation (QMC-SAC)
and spin wave theory, we study magnetic excitations of Heisenberg models with diagonally …

Symmetry, anomaly and duality put strong constraints on the low-energy physics of the
quantum field theory. In this dissertation, we used generalized symmetry and symmetry …

Low-temperature thermal conductivity (κ), as well as the magnetic properties and specific
heat, are studied for the frustrated zigzag spin-chain material SrEr 2 O 4 by using single …