Editing Cadmium arsenide (section)

=== Electronic ===

The compound cadmium arsenide has a lower vapor pressure (0.8 atm) than both cadmium and arsenic separately. Cadmium arsenide does not decompose when it is vaporized and re-condensed. [[Semiconductor|Carrier Concentration]]  in Cd<sub>3</sub>As<sub>2</sub> are usually (1–4)×10<sup>18</sup> electrons/cm<sup>3</sup>. Despite having high carrier concentrations, the electron mobilities are also very high (up to 10,000&nbsp;cm<sup>2</sup>/(V·s) at room temperature).<ref>{{Cite journal | doi = 10.1002/pssb.2220940153| title = Inverted band structure of Cd<sub>3</sub>As<sub>2</sub>| journal = Physica Status Solidi B| volume = 94| pages = K57–K60| year = 1979| last1 = Dowgiałło-Plenkiewicz | first1 = B.| last2 = Plenkiewicz | first2 = P.| issue = 1| bibcode = 1979PSSBR..94...57D}}</ref>

In 2014 Cd<sub>3</sub>As<sub>2</sub> was shown to be a [[semimetal]] material analogous to [[graphene]] that exists in a 3D form that should be much easier to shape into electronic devices.<ref>{{Cite journal | doi = 10.1038/ncomms4786| pmid = 24807399| title = Observation of a three-dimensional topological Dirac semimetal phase in high-mobility Cd<sub>3</sub>As<sub>2</sub>| journal = Nature Communications| volume = 5| pages = 3786| year = 2014| last1 = Neupane | first1 = M. | last2 = Xu | first2 = S. Y. | last3 = Sankar | first3 = R. | last4 = Alidoust | first4 = N. | last5 = Bian | first5 = G. | last6 = Liu | first6 = C. | last7 = Belopolski | first7 = I. | last8 = Chang | first8 = T. R. | last9 = Jeng | first9 = H. T. | last10 = Lin | first10 = H. | last11 = Bansil | first11 = A. | last12 = Chou | first12 = F. | last13 = Hasan | first13 = M. Z. | bibcode = 2014NatCo...5.3786N| arxiv = 1309.7892 }}</ref><ref name=doi3990/> Three-dimensional (3D) topological Dirac semimetals (TDSs) are bulk analogues of [[graphene]] that also exhibit non-trivial topology in its electronic structure that shares similarities with topological insulators. Moreover, a TDS can potentially be driven into other exotic phases (such as Weyl semimetals, axion insulators and topological [[superconductor]]s), [[Angle-resolved photoemission spectroscopy]] revealed a pair of 3D [[Dirac fermion]]s in Cd<sub>3</sub>As<sub>2</sub>. Compared with other 3D TDSs, for example, β-cristobalite {{chem|Bi|O|2}} and {{chem|Na|3Bi}}, Cd<sub>3</sub>As<sub>2</sub> is stable and has much higher Fermi velocities. In situ doping was used to tune its Fermi energy.<ref name=doi3990>{{Cite journal | doi = 10.1038/nmat3990| pmid = 24859642| title = A stable three-dimensional topological Dirac semimetal Cd<sub>3</sub>As<sub>2</sub>| journal = Nature Materials| volume = 13| issue = 7| pages = 677–81| year = 2014| last1 = Liu | first1 = Z. K.| last2 = Jiang | first2 = J.| last3 = Zhou | first3 = B.| last4 = Wang | first4 = Z. J.| last5 = Zhang | first5 = Y.| last6 = Weng | first6 = H. M.| last7 = Prabhakaran | first7 = D.| last8 = Mo | first8 = S. K. | last9 = Peng | first9 = H.| last10 = Dudin | first10 = P.| last11 = Kim | first11 = T.| last12 = Hoesch | first12 = M.| last13 = Fang | first13 = Z.| last14 = Dai | first14 = X.| last15 = Shen | first15 = Z. X.| last16 = Feng | first16 = D. L.| last17 = Hussain | first17 = Z.| last18 = Chen | first18 = Y. L.| bibcode = 2014NatMa..13..677L}}</ref>