Magnon-phonon hybrid excitations are studied theoretically in a two-dimensional
antiferromagnet with an easy axis normal to the plane. We show that two magnon bands and …

The eigenvalues of a parameter-dependent Hamiltonian matrix form a band structure in
parameter space. In such N-band systems, the quantum geometric tensor (QGT), consisting …

We study the unconventional topological phases of polaritons inside a cavity waveguide,
demonstrating how strong light-matter coupling leads to a breakdown of the bulk-edge …

As lattice analogs of fractional quantum Hall systems, fractional Chern insulators (FCIs)
exhibit enigmatic physical properties resulting from the intricate interplay between single …

The geometric interpretation of (pseudo) spin-1/2 systems on the Bloch sphere has been
appreciated across different areas ranging from condensed matter to quantum information …

Narrow-band electron systems are particularly likely to exhibit correlated many-body phases
driven by interaction effects. Examples include magnetic materials, heavy-fermion systems …

We classify the topology of the quench dynamics by homotopy groups. A relation between
the topological invariant of a postquench order parameter and the topological invariant of a …

Calculating the observables of a Hamiltonian requires taking matrix elements of operators in
the eigenstate basis. Since eigenstates are only defined up to arbitrary phases that depend …

The family of hole-doped Pr-based perovskite cobaltites, Pr 0.5 Ca 0.5 CoO 3 and (Pr 1− y
RE y) 0.3 Ca 0.7 CoO 3 (where RE is rare earth), has recently been found to exhibit …

The quantum anomalous Hall system with Chern number 2 can be destroyed by sufficiently
strong disorder. During its process towards localization, it was found that the electronic …