Experimental perspective on three-dimensional topological semimetals

BQ Lv, T Qian, H Ding - Reviews of Modern Physics, 2021 - APS
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 …

Weyl and Dirac semimetals in three-dimensional solids

NP Armitage, EJ Mele, A Vishwanath - Reviews of Modern Physics, 2018 - APS
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 …

Weyl, Dirac and high-fold chiral fermions in topological quantum matter

MZ Hasan, G Chang, I Belopolski, G Bian… - Nature Reviews …, 2021 - nature.com
Quantum materials hosting Weyl fermions have opened a new era of research in condensed
matter physics. First proposed in 1929 in the context of particle physics, Weyl fermions have …

Giant anomalous Hall effect in a ferromagnetic kagome-lattice semimetal

E Liu, Y Sun, N Kumar, L Muechler, A Sun, L Jiao… - Nature physics, 2018 - nature.com
Magnetic Weyl semimetals with broken time-reversal symmetry are expected to generate
strong intrinsic anomalous Hall effects, due to their large Berry curvature. Here, we report a …

Topological chiral crystals with helicoid-arc quantum states

DS Sanchez, I Belopolski, TA Cochran, X Xu, JX Yin… - Nature, 2019 - nature.com
The quantum behaviour of electrons in materials is the foundation of modern electronics and
information technology,,,,,,,,,–, and quantum materials with topological electronic and optical …

Quantized circular photogalvanic effect in Weyl semimetals

F De Juan, AG Grushin, T Morimoto… - Nature communications, 2017 - nature.com
The circular photogalvanic effect (CPGE) is the part of a photocurrent that switches
depending on the sense of circular polarization of the incident light. It has been consistently …

Experimental discovery of Weyl semimetal TaAs

BQ Lv, HM Weng, BB Fu, XP Wang, H Miao, J Ma… - Physical Review X, 2015 - APS
Weyl semimetals are a class of materials that can be regarded as three-dimensional
analogs of graphene upon breaking time-reversal or inversion symmetry. Electrons in a …

Weyl semimetal phase in noncentrosymmetric transition-metal monophosphides

H Weng, C Fang, Z Fang, BA Bernevig, X Dai - Physical Review X, 2015 - APS
Based on first-principle calculations, we show that a family of nonmagnetic materials
including TaAs, TaP, NbAs, and NbP are Weyl semimetals (WSM) without inversion centers …

Observation of Weyl nodes in TaAs

BQ Lv, N Xu, HM Weng, JZ Ma, P Richard, XC Huang… - Nature Physics, 2015 - nature.com
In 1929, H. Weyl proposed that the massless solution of the Dirac equation represents a pair
of a new type of particles, the so-called Weyl fermions. However, their existence in particle …

Unconventional chiral fermions and large topological Fermi arcs in RhSi

G Chang, SY Xu, BJ Wieder, DS Sanchez, SM Huang… - Physical review …, 2017 - APS
The theoretical proposal of chiral fermions in topological semimetals has led to a significant
effort towards their experimental realization. In particular, the Fermi surfaces of chiral …