One of the simplest quantum many-body systems is the spin-1/2 Heisenberg
antiferromagnetic chain, a linear array of interacting magnetic moments. Its exact ground …

We review applications of the sine-Gordon model, the O (3) non-linear sigma model, the U
(1) Thirring model, and the O (N) Gross–Neveu model to quasi one-dimensional quantum …

We show that a class of exactly solvable quantum Ising models, including the transverse-
field Ising model and anisotropic XY model, can be characterized as the loops in a two …

Quantum spin liquids are long-range entangled states of matter with emergent gauge fields
and fractionalized excitations. While candidate materials, such as the Kitaev honeycomb …

Two-stage spin-flop transitions are observed in the quasi-one-dimensional antiferromagnet
BaCu 2 Si 2 O 7. A magnetic field applied along the easy axis induces a spin-flop transition …

A green chemistry strategy was developed to prepare two barium copper silicate pigments.
Chinese purple BaCuSi 2 O 6 and dark blue BaCu 2 Si 2 O 7 are synthesized through mild …

Quantum dynamics of strongly correlated systems is a challenging problem. Although the
low energy fractional excitations of one-dimensional integrable models are often well …

In conventional quasi-one-dimensional antiferromagnets with quantum spins, magnetic
excitations are carried by either magnons or spinons in different energy regimes: they do not …

Elastic and inelastic neutron scattering were used to study the ordered phase of the quasi-
one-dimensional spin-1/2 antiferromagnet BaCu 2 Si 2 O 7. The previously proposed model …

We visualize antiferromagnetic domains in a representative quasi-one-dimensional S= 1/2
quantum antiferromagnet, BaCu 2 Si 2 O 7, using nonreciprocal directional dichroism, which …