2016/01/31 by D. Neubauer, David Neubauer, J. P. Carbotte +8 · 5 citations
Materials Science · Physics and Astronomy · #Band gap #Condensed matter physics #Dirac (video compression format) #Graphene research and applications #Omega #Physics #Quantum and electron transport phenomena #Quantum mechanics #Semimetal #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.93.121202
published as Phys. Rev. B 93, 121202 (2016) · final version, as published in PRB
openalex publication_date 2016/03/16 · arxiv created 2016/06/09 · arxiv updated 2016/06/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We measured the optical reflectivity of [001]-oriented n-doped Cd3As2 in a broad frequency range (50--22 000 cm^\ensuremath-1) for temperatures from 10 to 300 K. The optical conductivity, \ensuremathσ(\ensuremathω)=\ensuremathσ1(\ensuremathω)+i\ensuremathσ2(\ensuremathω), is isotropic within the (001) plane; its real part follows a power law, \ensuremathσ1(\ensuremathω)\ensuremath∝\ensuremathω1.65, in a large interval from 2000 to 8000cm^\ensuremath-1. This behavior is caused by interband transitions between two Dirac bands, which are effectively described by a sublinear dispersion relation, E(k)\ensuremath∝|k|0.6. The momentum-averaged Fermi velocity of the carriers in these bands is energy dependent and ranges from 1.2\ifmmode×\else\texttimes\fi105 to 3\ifmmode×\else\texttimes\fi105 m/s, depending on the distance from the Dirac points. We detect a gaplike feature in \ensuremathσ1(\ensuremathω) and associate it with the Fermi level positioned around 100 meV above the Dirac points.