At sufficiently low temperatures, magnetic materials often enter correlated phases hosting
collective, coherent magnetic excitations such as magnons or triplons. Drawing on the …

Topological properties play an increasingly important role in future research and technology.
This also applies to the field of topological magnetic excitations which has recently become …

Polarisation states are described by spin expectation values, known as Stokes parameters,
the trajectories of which in a rotationally symmetric system form a sphere named after …

We investigate topological properties and classification of mean-field theories of stable
bosonic systems. Of the three standard classifying symmetries, only time reversal represents …

Spin is a fundamental degree of freedom, which was discovered by Dirac for an electron in
his relativistic quantum mechanics, known as the Dirac equation. The origin of spin for a …

Krein-Hermitian Hamiltonians, ie, Hamiltonians Hermitian with respect to an indefinite inner
product, have emerged as an important class of non-Hermitian Hamiltonians in physics …

Topology applied to condensed matter is an important area of research and technology, and
topological magnetic excitations have recently become an active field of study. This paper …

The discovery by Kane and Mele of a model of spinful electrons characterized by a Z 2
topological invariant had a lasting effect on the study of electronic band structures. Given …

The Weyl-Wigner formalism for evaluating the intrinsic information of Dirac bispinors as
correlated qubits (localized) in a magnetic field is investigated in the extension to statistical …

The coherent state from a laser source has spin and orbital degrees of freedom, which allow
an arbitrary superposition state among orthogonal states with varying amplitudes and …