Tantalum arsenide

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| Name = Tantalum arsenide

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| ImageFile = File:TaAs Structure.png

| ImageAlt = Tantalum arsenide crystal structure.

| ImageCaption = {{Color box|#0000ff|border=silver}} Ta {{Color box|#ff0000|border=silver}} As

| ImageSize = 150px

| Section1 = {{Chembox Identifiers

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| SMILES = [As]#[Ta]

| StdInChI=1S/As.Ta

| StdInChIKey=WCMKFCQUZDOHAQ-UHFFFAOYSA-N

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| Section2 = {{Chembox Properties

| Formula = TaAs

| MolarMass = 255.869 g/mol

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| Density = 12.25 g/cm³{{cite journal | vauthors=((Furuseth, S.)), ((Selte, K.)), ((Kjekshus, A.)), ((Gronowitz, S.)), ((Hoffman, R. A.)), ((Westerdahl, A.)) | journal=Acta Chemica Scandinavica | title=On the Arsenides and Antimonides of Tantalum. | volume=19 | pages=95–106 | date= 1965 | issn=0904-213X | doi=10.3891/acta.chem.scand.19-0095| doi-access=free }}

| MeltingPt = Decomposes at 1400°C{{cite journal | vauthors=((Li, Z.)), ((Chen, H.)), ((Jin, S.)), ((Gan, D.)), ((Wang, W.)), ((Guo, L.)), ((Chen, X.)) | journal=Crystal Growth & Design | title=Weyl Semimetal TaAs: Crystal Growth, Morphology, and Thermodynamics | volume=16 | issue=3 | pages=1172–1175 | date=2 March 2016 | issn=1528-7505 | doi=10.1021/acs.cgd.5b01758}}

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| Section3 = {{Chembox Structure

| CrystalStruct = Body-centered tetragonal

| SpaceGroup = I4₁md, No. 109

| PointGroup = 4mm

| LattConst_a = 3.44 Å

| LattConst_c = 11.65 Å

| LattConst_ref ={{cite journal | vauthors=((Xu, S.-Y.)), ((Belopolski, I.)), ((Alidoust, N.)), ((Neupane, M.)), ((Bian, G.)), ((Zhang, C.)), ((Sankar, R.)), ((Chang, G.)), ((Yuan, Z.)), ((Lee, C.-C.)), ((Huang, S.-M.)), ((Zheng, H.)), ((Ma, J.)), ((Sanchez, D. S.)), ((Wang, B.)), ((Bansil, A.)), ((Chou, F.)), ((Shibayev, P. P.)), ((Lin, H.)), ((Jia, S.)), ((Hasan, M. Z.)) | journal=Science | title=Discovery of a Weyl fermion semimetal and topological Fermi arcs | volume=349 | issue=6248 | pages=613–617 | date=7 August 2015 | issn=1095-9203 | doi=10.1126/science.aaa9297| pmid=26184916 | arxiv=1502.03807 | bibcode=2015Sci...349..613X | s2cid=206636457 }}

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Tantalum arsenide is a compound of tantalum and arsenic with the formula TaAs. It is notable as being the first topological Weyl semimetal that was identified and characterized by ARPES. It exhibits an analogue of quantum vortices in momentum space.{{cite journal |last1=Figgemeier |first1=T. |last2=Ünzelmann |first2=M. |last3=Eck |first3=P. |last4=Schusser |first4=J. |last5=Crippa |first5=L. |last6=Neu |first6=J. N. |last7=Geldiyev |first7=B. |last8=Kagerer |first8=P. |last9=Buck |first9=J. |last10=Kalläne |first10=M. |last11=Hoesch |first11=M. |last12=Rossnagel |first12=K. |last13=Siegrist |first13=T. |last14=Lim |first14=L.-K. |last15=Moessner |first15=R. |last16=Sangiovanni |first16=G. |last17=Di Sante |first17=D. |last18=Reinert |first18=F. |last19=Bentmann |first19=H. |title=Imaging Orbital Vortex Lines in Three-Dimensional Momentum Space |journal=Physical Review X |date=13 February 2025 |volume=15 |issue=1 |doi=10.1103/PhysRevX.15.011032|doi-access=free }}