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"2D Weyl-Semimetal States Achieved by a Thickness-Dependent Crossover a" by Chan Wook Jang, Yusuff Adeyemi Salawu et al.

Despite theoretical expectations for 2D Weyl semimetals (WSMs), realizing stable 2D topological semimetal states experimentally is currently a great challenge. Here, 2D WSM states achieved by a thickness-dependent topological phase transition from 3D Dirac semimetal to 2D WSM in molecular-beam-epitaxy-grown Bi0.96Sb0.04 thin films are reported. 2D weak anti-localization (WAL) and chiral anomaly arise in the Bi0.96Sb0.04 films for thicknesses below ≈10 nm, supporting 2D Weyl semimetallic transport in the films. This is particularly evident from magnetoresistance (MR) measurements which show cusp structures at around B = 0, indicating WAL, and negative MR, typical of chiral anomaly, only for layers with thicknesses below ≈10 nm. The temperature dependencies of the dephasing length for various thicknesses are consistent with those of the MR. Analysis based on second harmonic generation, terahertz emission, Seebeck/Hall effects, Raman scattering, X-ray diffraction, and X-ray photoemiss ....

Chiral Anomaly , Dirac Semimetal , Topological Phase Transition , Eak Anti Localization , Weyl Semimetal ,

Physics - A Textbook Dirac Semimetal

Researchers have synthesized a chalcogenide compound that has the electronic structure of an ideal Dirac semimetal which could facilitate the study of this exotic class of materials. ....

Matteo Rini , Dirac Semimetal , David Santos Cottin , F Le Mardel , University Of Fribourg ,

Researchers Uncover New 'Dancing' Quantum Material

Researchers Uncover New 'Dancing' Quantum Material
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William Alldred , William Alldredsep , Nyung Lee , Dirac Semimetal , Oak Ridge National Laboratory , Uncover New , Image Credit , Quantum Limit , New Kind , National High Magnetic Field Laboratory ,