Fermi surface interconnectivity and topology in Weyl fermion semimetals TaAs, TaP, NbAs, and NbP

Lee, Chi-Cheng; Xu, Su-Yang; Huang, Shin-Ming; Sanchez, Daniel S.; Belopolski, Ilya; Chang, Guoqing; Bian, Guang; Alidoust, Nasser; Zheng, Hao; Neupane, Madhab; Wang, Baokai; Bansil, Arun; Hasan, M. Zahid; Lin, Hsin

doi:10.1103/physrevb.92.235104

Cited by 147 publications

(145 citation statements)

References 57 publications

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“…Four of these pairs are located near the Γ−Σ line (namely W 1 ) and the other eight pairs are located near the Γ − N line (namely W 2 ). These two kinds of Weyl points have different characteristics, with the W 2 points of TaP (TaAs) expected to be located far from (just at) the Fermi level E F suggested by band calculations 11 . The bulk electronic structures of these materials have been investigated by angle-resolved photoelectron spectroscopy using soft-Xray excitation light 12,13 .…”

Section: Introductionmentioning

confidence: 99%

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Optical signature of Weyl electronic structures in tantalum pnictides TaPn ( Pn= P, As)

et al. 2017

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To investigate the electronic structure of Weyl semimetals TaP n (P n = P, As), optical conductivity [σ(ω)] spectra are measured over a wide range of photon energies and temperatures, and these measured values are compared with band calculations. Two significant structures can be observed: a bending structure at ω ∼ 85 meV in TaAs, and peaks at ω ∼ 50 meV (TaP) and ∼ 30 meV (TaAs). The bending structure can be explained by the interband transition between saddle points connecting a set of W2 Weyl points. The temperature dependence of the peak intensity can be fitted by assuming the interband transition between saddle points connecting a set of W1 Weyl points. Owing to the different temperature dependence of the Drude weight in both materials, it is found that the Weyl points of TaAs are located near the Fermi level, whereas those of TaP are further away.

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Section: Introductionmentioning

confidence: 99%

“…109). According to band calculations, there are 12 pairs of Weyl points (24 points in total) 10,11 . Four of these pairs are located near the Γ−Σ line (namely W 1 ) and the other eight pairs are located near the Γ − N line (namely W 2 ).…”

Section: Introductionmentioning

confidence: 99%

Optical signature of Weyl electronic structures in tantalum pnictides TaPn ( Pn= P, As)

et al. 2017

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“…In addition to the charge sign and the spin of the electronic carriers, the Weyl semimetals introduce chirality as an appealing parameter for applications, and the chiral anomaly in the Weyl semimetals leads to a large negative magneto-resistance [10][11][12][13]. However, the properties associated with the Weyl nodes vary significantly across the AX series [14][15][16]. In order to understand how tuning the electronic properties of the Weyl semimetals for making devices based on powder, single-crystals or films of these compounds, it is necessary to characterize the crystal structure and the lattice dynamics of real samples.…”

Section: Introductionmentioning

confidence: 99%

Comparative Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP

Liu

Richard

Zhao

et al. 2016

J. Phys.: Condens. Matter

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We report a comparative polarized Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP. The evolution of the phonon frequencies with the sample composition allows us to determine experimentally which atoms are mainly involved for each vibration mode. Our results confirm previous first-principles calculations indicating that the A1, B1(2), E(2) and E(3) modes involve mainly the As(P) atoms, the B1(1) mode is mainly related to Ta(Nb) atoms, and the E(1) mode involves both kinds of atoms. By comparing the energy of the different modes, we establish that the B1(1), B1(2), E(2) and E(3) become harder with increasing chemical pressure. This behaviour differs from our observation on the A1 mode, which decreases in energy, in contrast to its behaviour under external pressure.

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“…[8] in this paper. The two types of Weyl nodes are located at slightly different energies, which vary from 20 to 50 meV for different Nb(Ta)P(As) compounds [8,9,37,54].…”

Section: Bulk and Surface Electron Statesmentioning

confidence: 99%

Crystal growth and electrical transport properties of niobium and tantalum monopnictide and dipnictide semimetals

Jia

2017

Front. Phys.

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The discovery of the first Weyl semimetal tantalum monoarsenide has greatly promoted physical research on the niobium and tantalum pnictide compounds. Crystallizing into the NbAs-and OsGe 2 -type structures, these mono-and di-pnictide semimetals manifest exotic electrical transport properties in magnetic field, which only occur in their single-crystalline forms. All the unusual electrical properties correspond to their poor carriers, which are indeed vulnerable to various crystal defects. In this review article, we present a comprehensive comparison of the crystal growth and electrical transport properties of the two semimetal families. We then discuss in detail the possible characteristic transport features, such as the chiral anomaly of Weyl quasiparticles. We emphasize the importance of crystal growth and sample manipulation for exploring the unique topological properties of Weyl semimetals in the future.

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Fermi surface interconnectivity and topology in Weyl fermion semimetals TaAs, TaP, NbAs, and NbP

Cited by 147 publications

References 57 publications

Optical signature of Weyl electronic structures in tantalum pnictides TaPn ( Pn= P, As)

Optical signature of Weyl electronic structures in tantalum pnictides TaPn ( Pn= P, As)

Comparative Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP

Crystal growth and electrical transport properties of niobium and tantalum monopnictide and dipnictide semimetals

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