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 …

The physics of quantum materials is dictated by many-body interactions and mathematical
concepts such as symmetry and topology that have transformed our understanding of matter …

Topological physics and strong electron–electron correlations in quantum materials are
typically studied independently. However, there have been rapid recent developments in …

Discoveries of topological states and topological materials have reshaped our
understanding of physics and materials over the past 15 years. First-principles calculations …

As a milestone in the exploration of topological physics, Fermi arcs bridging Weyl points
have been extensively studied. Weyl points, as are Fermi arcs, are believed to be only stable …

Recently, higher-order topological matter and 3D quantum Hall effects have attracted a great
amount of attention. The Fermi-arc mechanism of the 3D quantum Hall effect proposed to …

High-mobility two-dimensional carriers originating from surface Fermi arcs in magnetic Weyl
semimetals are highly desired for accessing exotic quantum transport phenomena and for …

Adsorption of alkali atoms onto material surfaces is widely utilized for controlling electronic
properties and is particularly effective for two-dimensional materials. While tuning the …

Topological quantum phases are largely understood in weakly correlated systems, which
have identified various quantum phenomena, such as the spin Hall effect, protected …

Here, using the ultrafast optical pump-probe spectroscopy, we have studied the
quasiparticle dynamics in the type-II Dirac semimetal NiTe 2. Anomalous dynamic optical …