New compounds and phase equilibria in the system Hf–Nb–As

Warczok, Piotr; Richter, Klaus W.

doi:10.1007/s00706-012-0755-z

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…However, to date the use of TWS in plasmonics has been hindered by the absence of samples with high crystalline quality. Specifically, the crystal growth from melt is impeded by the facile sublimation of As before melting and by the presence of other phases in the Ta-As [31] and Nb-As [32] binary system. Moreover, in standard conditions, chemical vapor transport using iodine as transport agent only provides crystals with small size (0.5-1.5 mm).…”

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confidence: 99%

Tunable surface plasmons in Weyl semimetals TaAs and NbAs

Chiarello

Hofmann

et al. 2019

Phys. Rev. B

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By means of high-resolution electron energy loss spectroscopy, we investigate the low-energy excitation spectrum of transition-metal monopnictides hosting Weyl fermions. We observe gapped plasmonic modes in (001)-oriented surfaces of single crystals of NbAs and TaAs at 66 and 68 meV, respectively. Our findings are consistent with theory and we estimate an effective Coulomb interaction strength α eff ≈ 0.41 for both samples. We also demonstrate that the modification of the surface of transition-metal monopnictides by the adsorption of chemical species (in our case, oxygen and hydrocarbon fragments) changes the frequency of the plasmonic excitations, with a subsequent modification of the effective interaction strength in the 0.30-0.48 range. The remarkable dependence of plasmonic features on the presence of adsorbates paves the way for plasmonic sensors based on Weyl semimetals operating in the mid-infrared. arXiv:1811.04639v1 [cond-mat.mes-hall]

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confidence: 99%

Tunable surface plasmons in Weyl semimetals TaAs and NbAs

Chiarello

Hofmann

et al. 2019

Phys. Rev. B

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“…Specifically, the growth from melt of TaAs and NbAs TWS is impeded by the facile sublimation of As before melting and by the presence of other phases in the Ta‐As . and Nb‐As . binary system.…”

Section: Introductionmentioning

confidence: 99%

Toward the Effective Exploitation of Topological Phases of Matter in Catalysis: Chemical Reactions at the Surfaces of NbAs and TaAs Weyl Semimetals

Politano

Chiarello

et al. 2018

Adv Funct Materials

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By means of density functional theory and experiments, surface chemical reactivity of single crystals of NbAs and TaAs Weyl semimetals is studied.Weyl semimetals exhibit outstanding reactivity toward simple molecules (oxygen, carbon monoxide, and water), with several active sites available for surface chemical reactions (adsorption, decomposition, formation of reaction products, recombination of decomposition fragments). When different chemical species are adsorbed on Weyl semimetals, strong lateral interactions between coadsorbed species occur, evidenced by CO-promoted water decomposition at room temperature. The resulting OH groups react with CO to form HCOO, which is an intermediate species in watergas shift reaction. These findings unambiguously demonstrate that Weyl semimetals could be effectively used in catalysis, whereas their employment in nanoelectronics or plasmonics is complicated by the poor ambient stability, due to the rapid surface oxidation, inevitably occurring unless protective capping layers are used.

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A structural survey of the binary transition metal phosphides and arsenides of the d-block elements

Chen

Whitmire

2018

Coordination Chemistry Reviews

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New compounds and phase equilibria in the system Hf–Nb–As

Cited by 3 publications

References 33 publications

Tunable surface plasmons in Weyl semimetals TaAs and NbAs

Tunable surface plasmons in Weyl semimetals TaAs and NbAs

Toward the Effective Exploitation of Topological Phases of Matter in Catalysis: Chemical Reactions at the Surfaces of NbAs and TaAs Weyl Semimetals

A structural survey of the binary transition metal phosphides and arsenides of the d-block elements

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