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Bulk-surface correspondence in Weyl semimetals ensures the formation of topological "Fermi arc" surface bands whose existence is guaranteed by bulk Weyl nodes. By investigating three distinct surface terminations of the ferromagnetic semimetal CoSnS, we verify spectroscopically its classification as a time-reversal symmetry-broken Weyl semimetal. We show that the distinct surface potentials imposed by three different terminations modify the Fermi-arc contour and Weyl node connectivity. On the tin (Sn) surface, we identify intra-Brillouin zone Weyl node connectivity of Fermi arcs, whereas on cobalt (Co) termination, the connectivity is across adjacent Brillouin zones. On the sulfur (S) surface, Fermi arcs overlap with nontopological bulk and surface states. We thus resolve both topologically protected and nonprotected electronic properties of a Weyl semimetal.
This article was published in the following journal.
Name: Science (New York, N.Y.)
Weyl semimetals are crystalline solids that host emergent relativistic Weyl fermions and have characteristic surface Fermi-arcs in their electronic structure. Weyl semimetals with broken time reversal...
The monopnictides TaAs and TaP are well-established Weyl semimetals. Yet, a precise assignment of Fermi arcs, accommodating the predicted chiral charge of the bulk Weyl points, has been difficult in t...
We report a theoretical investigation of magnetic, electronic, and topological properties of Hg<sub>1-x</sub>Mn<sub>x</sub>Te alloys. We conside...
We study the effects of coupling between surface plasmon and Fermi arc plasmon modes on a planar surface of the Weyl semimetal. A model Hamiltonian is proposed in the second quantization representatio...
We simulated highly tunable Weyl-semimetal bands using superconducting quantum circuits. Driving the superconducting quantum circuits with microwave fields, we mapped the momentum space of a lattice t...
With the development of economics in China, the dietary diversity got higher. Meanwhile, the prevalence of metabolic syndrome (MetS) raised up as well. To investigate the gender difference...
The problems in motor activity associated with Parkinson's disease are still poorly understood. Patients with Parkinson's disease often suffer from extremely slow movements (bradykinesia)...
Bidirectional communication between the CNS and the GI tract - the brain-gut axis - occurs both in health and disease.Patients with mechanical ventilation in ICU (ICU) often meet the neces...
To assess, in donor-recipient clusters, current models of HIV-1 genetic evolution and pathogenesis, based on the sequence diversity displayed by this lentivirus.
The purpose of this study is to obtain chemical information from part of your body without a biopsy. This is done using a technique called magnetic resonance spectroscopy (MRS) which is si...
The phenomenon of immense variability characteristic of ANTIBODIES. It enables the IMMUNE SYSTEM to react specifically against the essentially unlimited kinds of ANTIGENS it encounters. Antibody diversity is accounted for by three main theories: (1) the Germ Line Theory, which holds that each antibody-producing cell has genes coding for all possible antibody specificities, but expresses only the one stimulated by antigen; (2) the Somatic Mutation Theory, which holds that antibody-producing cells contain only a few genes, which produce antibody diversity by mutation; and (3) the Gene Rearrangement Theory, which holds that antibody diversity is generated by the rearrangement of IMMUNOGLOBULIN VARIABLE REGION gene segments during the differentiation of the ANTIBODY-PRODUCING CELLS.
Glycoproteins attached to the surface coat of the trypanosome. Many of these glycoproteins show amino acid sequence diversity expressed as antigenic variations. This continuous development of antigenically distinct variants in the course of infection ensures that some trypanosomes always survive the development of immune response to propagate the infection.
A genus of SPONGES in the family Plakinidae, with the skeleton formed by small diactine (and some triactine) needle-like terminations.
The measurement of various aspects of MAGNETIC FIELDS.
Waves of oscillating electric and MAGNETIC FIELDS which move at right angles to each other and outward from the source.