Weyl and Dirac semimetals are three-dimensional phases of matter with gapless electronic
excitations that are protected by topology and symmetry. As three-dimensional analogs of …

Topological semimetals (TSMs) are characterized by bulk band crossings in their electronic
structures, which are expected to give rise to gapless electronic excitations and topological …

Recently, a type-II Weyl fermion was theoretically predicted to appear at the contact of
electron and hole Fermi surface pockets. A distinguishing feature of the surfaces of type-II …

Three-dimensional (3D) topological semimetals represent a new class of topological
matters. The study of this family of materials has been at the frontiers of condensed matter …

The realization of Weyl systems with the minimum nonzero number of Weyl points (WPs)
and full spin polarization remains challenging in topology physics and spintronic. In this …

In quantum field theory, Weyl fermions are relativistic particles that travel at the speed of light
and strictly obey the celebrated Lorentz symmetry. Their low-energy condensed matter …

Emergent topological Dirac semimetals afford fresh pathways for optoelectronics, although
device implementation has been elusive to date. Specifically, palladium ditelluride (PdTe2) …

We report on a systematic study of type-II Dirac fermions in a layered crystal of PdT e 2. De
Haas–van Alphen oscillations show a small Fermi-surface pocket with a cross section of …

Topological type-II nodal line semimetal (NLS) was proposed quite recently and exhibits
distinct properties compared with conventional type-I NLS. To date, no ambient-condition …

Type-II Dirac/Weyl semimetals are characterized by strongly tilted Dirac cones such that the
Dirac/Weyl node emerges at the boundary of electron and hole pockets as a new state of …