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• W1981783535 abstract "The response to an electric field (dc and ac) of electronic systems in which the Fermi ``surface'' consists of a number of three-dimensional (3D) Weyl points (such as some pyrochlore iridates) exhibits a peculiar combination of characteristics usually associated with insulating and conducting behavior. Generically a neutral plasma in clean materials can be described by a tight-binding model with a strong spin-orbit interaction. A system of that type has a vanishing dc conductivity; however the current response to the dc field is very slow: The current decays with time in a powerwise manner, different from an insulator. The ac conductivity, in addition to a finite real part ${ensuremath{sigma}}^{ensuremath{'}}(ensuremath{Omega})$ which is linear in frequency, exhibits an imaginary part ${ensuremath{sigma}}^{ensuremath{'}ensuremath{'}}(ensuremath{Omega})$ that increases logarithmically as a function of the UV cutoff (atomic scale). This leads to a substantial dielectric response like a large dielectric constant at low frequencies. This is in contrast to a two-dimensional (2D) Weyl semimetal-like graphene at a neutrality point where the ac conductivity is purely pseudodissipative. The Coulomb interaction between electrons is long range and sufficiently strong to make a significant impact on transport. The interaction contribution to the ac conductivity is calculated within the tight-binding model. The result for the real part expressed via the renormalized (at frequency $overline{ensuremath{Omega}}$) Fermi velocity $v$ is $ensuremath{Delta}{ensuremath{sigma}}^{ensuremath{'}}(ensuremath{Omega})={e}^{4}ensuremath{Omega}/(9{ensuremath{pi}}^{2}ensuremath{hbar}v)[2mathrm{log}(ensuremath{Omega}/overline{ensuremath{Omega}})ensuremath{-}5]$." @default.
• W1981783535 created "2016-06-24" @default.
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• W1981783535 date "2013-07-03" @default.
• W1981783535 modified "2023-09-30" @default.
• W1981783535 title "Dynamics of electric transport in interacting Weyl semimetals" @default.
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• W1981783535 doi "https://doi.org/10.1103/physrevb.88.045108" @default.
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