Topology, a mathematical concept, has recently become a popular and truly
transdisciplinary topic encompassing condensed matter physics, solid state chemistry, and …

Multifold degenerate fermions in electronic structures of topological materials give rise to
many interesting physics properties. Among them, three-, six-, and eightfold degenerate …

Topological phonons in materials are associated with specific atomic lattice vibrations
around the terahertz frequency ranges, offering a rich platform for studying various boson …

Topological states with quadratic dispersion and multiple-fold band degeneracy have not
only fundamentally updated our knowledge of the phases of matter but also become a major …

Fermionic quasiparticles in solids have attracted tremendous attention in the last decades.
The conceptual framework of quasiparticles has recently been extended to bosonic systems …

Due to the lack of full rotational symmetry in condensed matter physics, solids exhibit new
excitations beyond Dirac and Weyl fermions, of which the sixfold excitations have attracted …

Abstract Space groups describing the symmetry of lattice structure allow the emergence of
fermionic quasiparticles with various degeneracy in the band structure. Theoretical efforts …

Since the discovery of the Weyl fermion in the material Ta As, searching for new types of
(quasi) particles in the universe of condensed matter and materials, beyond those captured …

The discovery of topological semimetals with multifold band crossings has opened up a new
and exciting frontier in the field of topological physics. These materials exhibit large Chern …

Unconventional fermions, such as threefold, fourfold, sixfold, and eightfold fermions have
attracted intense attention in recent years. However, the concrete materials hosting …