Topological Lifshitz transitions and Fermi arc manipulation in Weyl semimetal NbAs

Yang, Haifeng; Yang, Lexian; Liu, Z. K.; Sun, Yan; Chen, C.; Han, Peng; Schmidt, Marcus; Prabhakaran, D.; Bernevig, B. Andrei; Felser, Claudia; Yan, Binghai; Chen, Y. L.

doi:10.1038/s41467-019-11491-4

Cited by 57 publications

(34 citation statements)

References 45 publications

(90 reference statements)

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“…Although the Fermi arcs are topologically protected, their shape depends on the boundary conditions. [24][25][26][27][28] Therefore, it is interesting what happens with the Fermi arc states if the surface is still parallel to the chiral shift but is, however, curved. A cylindric wire whose axis is directed along the chiral shift is one of the simplest geometries to study this question.…”

Section: Introductionmentioning

confidence: 99%

Fermi Arcs and DC Transport in Nanowires of Dirac and Weyl Semimetals

et al. 2020

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The transport properties and electron states in cylinder nanowires of Dirac and Weyl semimetals are studied paying special attention to the structure and properties of the surface Fermi arcs. The latter make the electric charge and current density distributions in nanowires strongly nonuniform as the majority of the charge density is accumulated at the surface. It is found that a Weyl semimetal wire also supports a magnetization current localized mainly at the surface because of the Fermi arcs contribution. By using the Kubo linear response approach, the direct current (DC) conductivity is calculated and it is found that its spatial profile is nontrivial. By explicitly separating the contributions of the surface and bulk states, it is shown that when the electric chemical potential and/or the radius of the wire is small, the electron transport is determined primarily by the Fermi arcs and the electrical conductivity is much higher at the surface than in the bulk. Due to the rise of the surface‐bulk transition rate, the relative contribution of the surface states to the total conductivity gradually diminishes as the chemical potential increases. In addition, the DC conductivity at the surface demonstrates noticeable peaks when the Fermi level crosses energies of the surface states.

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Section: Introductionmentioning

confidence: 99%

Fermi Arcs and DC Transport in Nanowires of Dirac and Weyl Semimetals

et al. 2020

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“…Up to now, a large number of WSMs have been reported, and some of which have been confirmed in experiments such as TaAs (Lv et al, 2015 ), NbP (Shekhar et al, 2015 ), and NbAs (Yang et al, 2019 ). These examples are all three-dimensional (3D) non-magnetic materials.…”

Section: Introductionmentioning

confidence: 83%

Weyl Fermions in VI3 Monolayer

et al. 2020

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We report the presence of a Weyl fermion in VI 3 monolayer. The material shows a sandwich-like hexagonal structure and stable phonon spectrum. It has a half-metal band structure, where only the bands in one spin channel cross the Fermi level. There are three pairs of Weyl points slightly below the Fermi level in spin-up channel. The Weyl points show a clean band structure and are characterized by clear Fermi arcs edge state. The effects of spin-orbit coupling, electron correlation, and lattice strain on the electronic band structure were investigated. We find that the half-metallicity and Weyl points are robust against these perturbations. Our work suggests VI 3 monolayer is an excellent Weyl half-metal.

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“…4(iii) and 4(iv)]. We attribute this finding due to the hybridization that happens between the surface states and the bulk states that are in close proximity; while the SA itself is able to rewire due to perturbation [37,38]. To further visualize the evolution of the SA at different binding energies, Figs.…”

Section: Lifshitz Transition In Nbirtementioning

confidence: 99%

Topological Lifshitz transition of the intersurface Fermi-arc loop in NbIrTe4

Ekahana

Sun

et al. 2020

Phys. Rev. B

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Surface arcs (SAs) or Fermi arcs connecting pairs of bulk Weyl points with opposite chiralities are the signatures of Weyl semimetals in angle-resolved photoemission spectroscopy (ARPES) studies. The nontrivial topology of the bulk band structure guarantees the existence of these exotic Fermi arcs with connectivity that is strongly dependent on the surface. It has been theoretically proposed and experimentally confirmed that Fermi arcs at opposite surfaces can complete an unusual closed cyclotron orbit called a Weyl orbit, which leads to various intriguing transport properties. In this paper, a systematic ARPES study on opposite terminations (001) of type-II Weyl semimetal NbIrTe 4 reveals different Fermi arc connections which result in a unique closed intersurface Fermi arc loop configurations (combining both projections of SAs) containing two pairs of Weyl points. In particular, the top surface ARPES data and corresponding ab initio calculation suggests that a topological Lifshitz transition occurs by tuning the chemical potential. SA rewiring on the top surface opens the intersurface arc loop at the Weyl node energy level into an open line, challenging the close-orbit description and leading to an unexplored scenario. Our results demonstrate the intrinsic alteration of Fermi arc connections and propose NbIrTe 4 as a potential platform to examine Fermi-arc related phenomenon.

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Topological Lifshitz transitions and Fermi arc manipulation in Weyl semimetal NbAs

Cited by 57 publications

References 45 publications

Fermi Arcs and DC Transport in Nanowires of Dirac and Weyl Semimetals

Fermi Arcs and DC Transport in Nanowires of Dirac and Weyl Semimetals

Weyl Fermions in VI3 Monolayer

Topological Lifshitz transition of the intersurface Fermi-arc loop in NbIrTe4

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