We review ground states and excitations of a quantum antiferromagnet on triangular and
other frustrated lattices. We pay special attention to the combined effects of magnetic field h …

Abstract Quantum spin-1/2 kagome Heisenberg antiferromagnet is the representative
frustrated system possibly hosting a spin liquid. Clarifying the nature of this elusive …

We propose an all optical ultrafast method to highly magnetize general quantum magnets
using a circularly polarized terahertz laser. The key idea is to utilize a circularly polarized …

This article is meant as a gentle introduction to the topological terms that often play a
decisive role in effective theories describing topological quantum effects in condensed …

We unveil nontrivial topological properties of zero-temperature magnetization plateau states
in periodically modulated quantum spin chains under a uniform magnetic field. As positions …

Spin parity effects refer to those special situations where a dichotomy in the physical
behavior of a system arises, solely depending on whether the relevant spin quantum …

We investigate the properties in finite magnetic field of an extended anisotropic XXZ spin-1/2
model on the kagome lattice, originally introduced by Balents, Fisher, and Girvin [Phys. Rev …

The bulk electric polarization works as a nonlocal order parameter that characterizes
topological quantum matters. Motivated by a recent paper [H. Watanabe, Phys. Rev. B 103 …

We investigate the properties of a three-leg quantum spin tube using several techniques
such as the density-matrix renormalization-group (DMRG) method, strong-coupling …

The spin-3 2 Heisenberg antiferromagnet on the bilayer honeycomb lattice is a minimal
model to describe the magnetic behavior of Bi 3 Mn 4 O 12 (NO 3). We study this model with …