منابع مشابه
VIEWPOINT Type - II Dirac Fermions Spotted
T he standard model of particle physics describes all the known elementary particles, like electrons and quarks. Many of these particles have analogs in condensed matter, where they arise as collective states, or quasiparticles. One example is an electronic state in graphene that behaves like a massless Dirac fermion—a spin-1/2 particle that is not its own antiparticle. But condensed-matter phy...
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Hai-Xiao Wang, ∗ Yige Chen, ∗ Zhi Hong Hang, Hae-Young Kee, 3, † and Jian-Hua Jiang † College of Physics, Optoelectronics and Energy, & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou 215006, China Department of Physics, University of Toronto, Toronto, M5S 1A7, Canada Canadian Institute for Advanced Research, Toronto, Ontario, M5...
متن کاملTriplet Fermions and Dirac Fermions in Borophene
Borophene is a monolayer materials made of boron. A perfect planar boropehene called β12 borophene has Dirac cones and they are well reproduced by a tight-binding model according to recent experimental and first-principles calculation results. We explicitly derive a Dirac theory for them. Dirac cones are gapless when the inversion symmetry exists, while they are gapped when it is broken. In add...
متن کاملExperimental Realization of Type-II Dirac Fermions in a PdTe_{2} Superconductor.
A Dirac fermion in a topological Dirac semimetal is a quadruple-degenerate quasiparticle state with a relativistic linear dispersion. Breaking either time-reversal or inversion symmetry turns this system into a Weyl semimetal that hosts double-degenerate Weyl fermion states with opposite chiralities. These two kinds of quasiparticles, although described by a relativistic Dirac equation, do not ...
متن کاملNeutrinos Are Nearly Dirac Fermions
Neutrino masses and mixings are analyzed in terms of left-handed fields and a 6 × 6 complex symmetric mass matrix M whose singular values are the neutrino masses. An angle xν characterizes the kind of the neutrinos, with xν = 0 for Dirac neutrinos and xν = π/2 for Majorana neutrinos. If xν = 0, then baryonminus-lepton number is conserved. When xν ≈ 0, the six neutrino masses coalesce into three...
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ژورنال
عنوان ژورنال: Physics
سال: 2017
ISSN: 1943-2879
DOI: 10.1103/physics.10.74