Dirac fermion
View article: Weyl and Dirac semimetals in three-dimensional solids
Weyl and Dirac semimetals in three-dimensional solids Open
Weyl and Dirac semimetals are three dimensional phases of matter with gapless\nelectronic excitations that are protected by topology and symmetry. As three\ndimensional analogs of graphene, they have generated much recent interest. Deep\nc…
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Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals Open
INTRODUCTION Condensed-matter systems have recently become a fertile ground for the discovery of fermionic particles and phenomena predicted in high-energy physics; examples include Majorana fermions, as well as Dirac and Weyl semimetals. …
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Dirac cone protected by non-symmorphic symmetry and three-dimensional Dirac line node in ZrSiS Open
Materials harbouring exotic quasiparticles, such as massless Dirac and Weyl fermions, have garnered much attention from physics and material science communities due to their exceptional physical properties such as ultra-high mobility and e…
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Dirac Semimetals in Two Dimensions Open
Graphene is famous for being a host of 2D Dirac fermions. However, spin-orbit coupling introduces a small gap, so that graphene is formally a quantum spin Hall insulator. Here we present symmetry-protected 2D Dirac semimetals, which featur…
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Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene Open
Electrons that flow like a fluid Electrons inside a conductor are often described as flowing in response to an electric field. This flow rarely resembles anything like the familiar flow of water through a pipe, but three groups describe co…
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Germanene: the germanium analogue of graphene Open
Recently, several research groups have reported the growth of germanene, a new member of the graphene family. Germanene is in many aspects very similar to graphene, but in contrast to the planar graphene lattice, the germanene honeycomb la…
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Dirac Fermions in Borophene Open
Honeycomb structures of group IV elements can host massless Dirac fermions with nontrivial Berry phases. Their potential for electronic applications has attracted great interest and spurred a broad search for new Dirac materials especially…
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Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe2 Open
Topological semimetals have recently attracted extensive research interests as host materials to condensed matter physics counterparts of Dirac and Weyl fermions originally proposed in high energy physics. Although Lorentz invariance is re…
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Giant negative magnetoresistance induced by the chiral anomaly in individual Cd3As2 nanowires Open
Dirac electronic materials beyond graphene and topological insulators have recently attracted considerable attention. Cd 3 As 2 is a Dirac semimetal with linear dispersion along all three momentum directions and can be viewed as a three-di…
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Multiple Types of Topological Fermions in Transition Metal Silicides Open
Exotic massless fermionic excitations with nonzero Berry flux, other than the Dirac and Weyl fermions, could exist in condensed matter systems under the protection of crystalline symmetries, such as spin-1 excitations with threefold degene…
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Topological quantum computation based on chiral Majorana fermions Open
Significance We propose a platform of quantum computation using the chiral Majorana fermions on the edges of topological materials. The quantum gates are naturally accomplished by the propagation of chiral Majorana fermions. If realized, i…
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Large nonsaturating magnetoresistance and signature of nondegenerate Dirac nodes in ZrSiS Open
Significance Topological semimetals provide the opportunity to explore the fundamental physics of relativistic particles and offer the possibility of technological applications. However, finding robust systems with a sufficiently large ran…
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Transport of Topological Semimetals Open
Three-dimensional (3D) topological semimetals represent a new class of topological matters. The study of this family of materials has been at the frontiers of condensed matter physics, and many breakthroughs have been made. Several topolog…
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Thermal fractionalization of quantum spins in a Kitaev model: Temperature-linear specific heat and coherent transport of Majorana fermions Open
Finite-temperature ($T$) properties of a Kitaev model defined on a honeycomb\nlattice are investigated by a quantum Monte Carlo simulation, from the\nviewpoint of fractionalization of quantum $S=1/2$ spins into two types of\nMajorana fermi…
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Dirac State in the FeB<sub>2</sub> Monolayer with Graphene-Like Boron Sheet Open
By introducing the commonly utilized Fe atoms into a two-dimensional (2D) honeycomb boron network, we theoretically designed a new Dirac material of FeB2 monolayer with a Fermi velocity in the same order of graphene. The electron transfer …
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Particle-vortex duality of two-dimensional Dirac fermion from electric-magnetic duality of three-dimensional topological insulators Open
Particle-vortex duality is a powerful theoretical tool that has been used to study bosonic systems. Here we propose an analogous duality for Dirac fermions in 2+1 dimensions. The physics of a single Dirac cone is proposed to be described b…
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Quantum Hall effect in a bulk antiferromagnet EuMnBi <sub>2</sub> with magnetically confined two-dimensional Dirac fermions Open
Quantum transport of quasi–two-dimensional Dirac fermions is largely controlled by magnetic order in a layered magnet.
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Detection of sub-MeV dark matter with three-dimensional Dirac materials Open
Here, we propose the use of three-dimensional Dirac materials as targets for direct detection of sub-MeV dark matter. Dirac materials are characterized by a linear dispersion for low-energy electronic excitations, with a small band gap of …
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Unconventional superconductivity in nearly flat bands in twisted bilayer graphene Open
Flat electronic bands can accommodate a plethora of interaction driven\nquantum phases, since kinetic energy is quenched therein and electronic\ninteractions therefore prevail. Twisted bilayer graphene, near so-called the\n"magic angles", …
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Ultrafast Broadband Photodetectors Based on Three-Dimensional Dirac Semimetal Cd<sub>3</sub>As<sub>2</sub> Open
Photodetection with extreme performances in terms of ultrafast response time, broad detection wavelength range, and high sensitivity has a wide range of optoelectronic and photonic applications, such as optical communications, interconnect…
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Topological Superconductivity in Dirac Semimetals Open
Dirac semimetals host bulk band-touching Dirac points and a surface Fermi loop. We develop a theory of superconducting Dirac semimetals. Establishing a relation between the Dirac points and the surface Fermi loop, we clarify how the nontri…
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Aharonov–Bohm oscillations in Dirac semimetal Cd3As2 nanowires Open
Three-dimensional Dirac semimetals, three-dimensional analogues of graphene, are unusual quantum materials with massless Dirac fermions, which can be further converted to Weyl fermions by breaking time reversal or inversion symmetry. Topol…
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Four-loop critical exponents for the Gross-Neveu-Yukawa models Open
We study the chiral Ising, the chiral XY and the chiral Heisenberg models at\nfour-loop order with the perturbative renormalization group in $4-\\epsilon$\ndimensions and compute critical exponents for the Gross-Neveu-Yukawa fixed\npoints …
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Experimental evidence of hourglass fermion in the candidate nonsymmorphic topological insulator KHgSb Open
Photoemission established KHgSb as a nonsymmorphic topological insulator, which hosts hourglass-shaped surface states.
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Experimental Observation of a Topological Band Gap Opening in Ultracold Fermi Gases with Two-Dimensional Spin-Orbit Coupling Open
The recent experimental realization of synthetic spin-orbit coupling (SOC) opens a new avenue for exploring novel quantum states with ultracold atoms. However, in experiments for generating two-dimensional SOC (e.g., Rashba type), a perpen…
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Nearly massless Dirac fermions and strong Zeeman splitting in the nodal-line semimetal ZrSiS probed by de Haas–van Alphen quantum oscillations Open
Topological semimetals represent a new class of quantum materials hosting\nDirac/Weyl fermions. The essential properties of topological fermions can be\nrevealed by quantum oscillations. Here we present the first systematic de\nHaas-van Al…
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Near-room-temperature Chern insulator and Dirac spin-gapless semiconductor: nickel chloride monolayer Open
We report NiCl3 monolayer as a novel near-room-temperature Chern insulator and Dirac spin-gapless semiconductor, rendering NiCl3 with great potential for spintronic application.
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Quantum transport in Dirac and Weyl semimetals: a review Open
Topological semimetals are well known for the linear energy band dispersion in the bulk state and topologically protected surface state with arc-like Fermi surface. The angle resolved photoemission spectroscopy experiments help confirm the…
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Strain-induced pseudomagnetic field in the Dirac semimetal borophene Open
A tight-binding model of 8-Pmmn borophene, a two-dimensional boron crystal, is developed. We confirm that the crystal hosts massless Dirac fermions and the Dirac points are protected by symmetry. Strain is introduced into the model, and it…
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Graphene plasmonics: physics and potential applications Open
Plasmon in graphene possesses many unique properties. It originates from the collective motion of massless Dirac fermions, and the carrier density dependence is distinctively different from conventional plasmons. In addition, graphene plas…