Pressure tuning of the electrical transport properties in the Weyl semimetal TaP

Besser, M.F.; Reis, R. D. dos; Fan, Fengren; Ajeesh, M. O.; Sun, Yan; Schmidt, Marcus; Felser, Claudia

doi:10.1103/physrevmaterials.3.044201

Cited by 6 publications

(2 citation statements)

References 36 publications

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“…The inset in this figure shows an image of the four‐point probe made exclusively for this measurement. We find a good agreement with previously reported data, [ 20 ] with the sample displaying a metallic behavior with a resistivity ratio ρ xx (300 K)/ ρ xx (2 K) ≈ 132. The Py film (50 nm) was grown by DC sputtering, and then, two thin metal electrodes were fixed to the TaP‐crystal by means of silver ink, as illustrated in Figure 1a.…”

Section: Resultssupporting

confidence: 92%

Efficient Spin‐to‐Charge Interconversion in Weyl Semimetal TaP at Room Temperature

Mendes

Vieira

Cunha

et al. 2022

Adv Materials Inter

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In this paper, spin‐to‐charge current conversion properties in the Weyl semimetal TaP by means of the inverse Rashba–Edelstein effect (IREE) with the interfacial integration of this quantum material with the ferromagnetic metal Permalloy (Py = Ni81Fe19) are presented. The spin currents are generated in the Py layer by the spin pumping effect (SPE) from microwave‐driven ferromagnetic resonance and are detected by a dc voltage along the TaP crystal, at room temperature. A field‐symmetric voltage signal is observed without the contamination of asymmetrical lines due to spin rectification effects observed in studies using metallic ferromagnets. The observed voltage is attributed to spin‐to‐charge current conversion based on the IREE, made possible by the spin–orbit coupling induced intrinsically by the bulk band structure of Weyl semimetals. The measured IREE coefficient λIREE = (0.30 ± 0.01) nm is two orders of magnitude larger than in graphene and is comparable to or larger than the values reported for some metallic interfaces and for several topological insulators.

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Section: Resultssupporting

confidence: 92%

Efficient Spin‐to‐Charge Interconversion in Weyl Semimetal TaP at Room Temperature

Mendes

Vieira

Cunha

et al. 2022

Adv Materials Inter

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“…1 The latter can be visualized as the curvature of the energy band or the Fermi surface, 2 whose topology can dramatically alter the electron transport, and thus give rise to exotic phenomena. [3][4][5][6][7][8][9][10] Recent findings in axis-dependent conduction polarity, or goniopolarity, reveal that charge carriers can be 'entangled' with the direction they travel in layered compound NaSn 2 As 2 , 11 originating from its hyperboloid open Fermi surface. In NaSn 2 As 2 , the effective mass has opposite signs along the in-plane x,y and the cross plane z axes.…”

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confidence: 99%

Anisotropic Scattering in Goniopolar Metal NaSn$_2$As$_2$

Wang,

Narang

2020

Preprint

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Recent experimental discoveries in axis-dependent conduction polarity, or goniopolarity, have observed that the charge carriers can conduct like either electrons or holes depending on the crystallographic direction they travel along in layered compounds such as NaSn 2 As 2 . To elucidate this unusual transport behavior, we present an ab initio study of electron scattering in such systems. We study different microscopic scattering mechanisms in NaSn 2 As 2 and present the electron-phonon scattering time distribution on its Fermi surface in momentum space, the anisotropy of which is proposed to be the origin of the axis-dependent conduction polarity. Further, we obtain the overall anisotropic lifetime tensors in real space at different electron chemical potentials and temperatures and discuss how they contribute to the macroscopic thermopower. While we find that the contribution of the in-plane and cross plane lifetimes exhibits a similar trend, the concave portion of the Fermi surface alters the electron motion significantly in the presence of a magnetic field, thus flipping the conduction polarity as measured via the Hall effect. Our calculations and analysis of NaSn 2 As 2 also suggests the strong possibility of hydrodynamic electron flow in the system. Finally, our work has implications for anisotropic electron lifetimes in a broad class of goniopolar materials and provides key, general insights into electron scattering on open Fermi surfaces.

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An ab-initio study on structural, elastic, electronic, bonding, thermal, and optical properties of topological Weyl semimetal TaX (X = P, As)

Naher

Naqib

2021

Sci Rep

119

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In recent days, study of topological Weyl semimetals have become an active branch of physics and materials science because they led to realization of the Weyl fermions and exhibited protected Fermi arc surface states. Therefore, topological Weyl semimetals TaX (X = P, As) are important electronic systems to investigate both from the point of view of fundamental physics and potential applications. In this work, we have studied the structural, elastic, mechanical, electronic, bonding, acoustic, thermal and optical properties of TaX (X = P, As) in detail via first-principles method using the density functional theory. A comprehensive study of elastic constants and moduli shows that both TaP and TaAs possesses low to medium level of elastic anisotropy (depending on the measure), reasonably good machinability, mixed bonding characteristics with ionic and covalent contributions, brittle nature and relatively high Vickers hardness with a low Debye temperature and melting temperature. The minimum thermal conductivities and anisotropies of TaX (X = P, As) are calculated. Bond population analysis supports the bonding nature as predicted by the elastic parameters. The bulk electronic band structure calculations reveal clear semi-metallic features with quasi-linear energy dispersions in certain sections of the Brillouin zone near the Fermi level. A pseudogap in the electronic energy density of states at the Fermi level separating the bonding and the antibonding states indicates significant electronic stability of tetragonal TaX (X = P, As).The reflectivity spectra show almost non-selective behavior over a wide range of photon energy encompassing visible to mid-ultraviolet regions. High reflectivity over wide spectral range makes TaX suitable as reflecting coating. TaX (X = P, As) are very efficient absorber of ultraviolet radiation. Both the compounds are moderately optically anisotropic owing to the anisotropic nature of the electronic band structure. The refractive indices are very high in the infrared to visible range. All the energy dependent optical parameters show metallic features and are in complete accord with the underlying bulk electronic density of states calculations.

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Pressure tuning of the electrical transport properties in the Weyl semimetal TaP

Cited by 6 publications

References 36 publications

Efficient Spin‐to‐Charge Interconversion in Weyl Semimetal TaP at Room Temperature

Efficient Spin‐to‐Charge Interconversion in Weyl Semimetal TaP at Room Temperature

Anisotropic Scattering in Goniopolar Metal NaSn$_2$As$_2$

An ab-initio study on structural, elastic, electronic, bonding, thermal, and optical properties of topological Weyl semimetal TaX (X = P, As)

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