Weyl Semimetal Phase in Solid-Solution Narrow-Gap Semiconductors

Fermion space charge in narrow band-gap semiconductors, Weyl semimetals, and around highly charged nuclei

The field of charged impurities in narrow band-gap semiconductors and Weyl semimetals can create electronhole pairs when the total charge Ze of the impurity exceeds a value Zce. The particles of one charge escape to infinity, leaving a screening space charge. The result is that the observable dimensionless impurity charge Q∞ is less than Z but greater than Zc. There is a corresponding effect fo...

Terahertz radiation emitters from narrow-gap semiconductors

Weyl Semimetal Phase in Noncentrosymmetric Transition- Metal Monophosphides

Hongming Weng, Chen Fang, Zhong Fang, B. Andrei Bernevig, and Xi Dai Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China Collaborative Innovation Center of Quantum Matter, Beijing 100084, China Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Department of Physics,...

Signature of type-II Weyl semimetal phase in MoTe2

Topological Weyl semimetal (TWS), a new state of quantum matter, has sparked enormous research interest recently. Possessing unique Weyl fermions in the bulk and Fermi arcs on the surface, TWSs offer a rare platform for realizing many exotic physical phenomena. TWSs can be classified into type-I that respect Lorentz symmetry and type-II that do not. Here, we directly visualize the electronic st...

π Berry phase and Zeeman splitting of Weyl semimetal TaP

The recent breakthrough in the discovery of Weyl fermions in monopnictide semimetals provides opportunities to explore the exotic properties of relativistic fermions in condensed matter. The chiral anomaly-induced negative magnetoresistance and π Berry phase are two fundamental transport properties associated with the topological characteristics of Weyl semimetals. Since monopnictide semimetals...