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SM ISO690:2012 NEUBAUER, David, CARBOTTE, Jules P., NATEPROV, A., LOHLE, Anja, DRESSEL, Martin, PRONIN, A.V.. Interband optical conductivity of the [001]-oriented Dirac semimetal Cd3As2. In: Physical Review B, 2016, vol. 93, pp. 1-7. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.93.121202 |
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Physical Review B | ||||||
Volumul 93 / 2016 / ISSN 2469-9950 /ISSNe 2469-9969 | ||||||
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DOI:https://doi.org/10.1103/PhysRevB.93.121202 | ||||||
Pag. 1-7 | ||||||
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We measured the optical reflectivity of [001]-oriented n-doped Cd3As2 in a broad frequency range (50-22 000 cm-1) for temperatures from 10 to 300 K. The optical conductivity, σ(ω)=σ1(ω)+iσ2(ω), is isotropic within the (001) plane; its real part follows a power law, σ1(ω)ω1.65, in a large interval from 2000 to 8000cm-1. This behavior is caused by interband transitions between two Dirac bands, which are effectively described by a sublinear dispersion relation, E(k)|k|0.6. The momentum-averaged Fermi velocity of the carriers in these bands is energy dependent and ranges from 1.2×105 to 3×105 m/s, depending on the distance from the Dirac points. We detect a gaplike feature in σ1(ω) and associate it with the Fermi level positioned around 100 meV above the Dirac points. |
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Cuvinte-cheie Weyl, Metalloids, Paul Adrien Maurice Dirac |
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