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• W2297191919 abstract "The interband optical response of a three-dimensional Dirac cone is linear in photon energy ($Omega$). Here, we study the evolution of the interband response within a model Hamiltonian which contains Dirac, Weyl and gapped semimetal phases. In the pure Dirac case, a single linear dependence is observed, while in the Weyl phase, we find two quasilinear regions with different slopes. These regions are also distinct from the large-$Omega$ dependence. As the boundary between the Weyl (WSM) and gapped phases is approached, the slope of the low-$Omega$ response increases, while the photon-energy range over which it applies decreases. At the phase boundary, a square root behaviour is obtained which is followed by a gapped response in the gapped semimetal phase. The density of states parallels these behaviours with the linear law replaced by quadratic behaviour in the WSM phase and the square root dependence at the phase boundary changed to $|omega|^{3/2}$. The optical spectral weight under the intraband (Drude) response at low temperature ($T$) and/or small chemical potential ($mu$) is found to change from $T^2$ ($mu^2$) in the WSM phase to $T^{3/2}$ ($|mu|^{3/2}$) at the phase boundary." @default.
• W2297191919 created "2016-06-24" @default.
• W2297191919 creator A5016718855 @default.
• W2297191919 creator A5065110499 @default.
• W2297191919 date "2016-02-29" @default.
• W2297191919 modified "2023-10-12" @default.
• W2297191919 title "Optical conductivity of Weyl semimetals and signatures of the gapped semimetal phase transition" @default.
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• W2297191919 doi "https://doi.org/10.1103/physrevb.93.085442" @default.
• W2297191919 hasPublicationYear "2016" @default.
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