The chiral anomaly-a hallmark of chiral spin-1/2 Weyl fermions-is an imbalance between left-
and right-moving particles that underpins phenomena such as particle decay and negative …

Topological materials usually possess protected gapless states in either the boundary or
bulk, exhibiting various properties such as spin-momentum locking, Klein tunneling, Fermi …

Internal interfaces in Weyl semimetals (WSMs) are predicted to host distinct topological
features that are different from the commonly studied external interfaces (crystal-to-vacuum …

In solid state systems, group representation theory is powerful in characterizing the behavior
of quasiparticles, notably the energy degeneracy. While conventional group theory is …

Quantum spin Hall (QSH) insulators, with their unique helical edge states where
counterpropagating edge channels possess opposite spins, have attracted broad interest …

In chiral crystals crystalline symmetries can protect multifold fermions, pseudorelativistic
masless quasiparticles that have no high-energy counterparts. Their realization in transition …

Exploration of topology is central in condensed matter physics and applications to fault-
tolerant quantum information. The bulk-boundary correspondence and tenfold classification …

Following nearly a century of research, it remains a puzzle that the low-lying excitations of
metals are remarkably well explained by effective single-particle theories of non-interacting …

Absence of any surface arc state has been regarded as the fundamental property of singular
Weyl points, because they are circumvented from the Nielsen‐Ninomiya no‐go theorem. In …

Exploration of topology protected by a certain symmetry is central in condensed matter
physics. A recent idea of subsymmetry protected (SSP) topology—remains of a broken …