Electronic Cooling in Weyl and Dirac Semimetals

Abstract

Energy transfer from electrons to phonons is an important consideration in any Weyl or Dirac semimetal based application. In this work, we analytically calculate the cooling power of acoustic phonons, i.e. the energy relaxation rate of electrons which are interacting with acoustic phonons, for Weyl and Dirac semimetals in a variety of different situations. For cold Weyl or Dirac semimetals with the Fermi energy at the nodal points, we find the electronic temperature, $T_e$, decays in time as a power law. In the heavily doped regime, $T_e$ decays linearly in time far away from equilibrium. In a heavily doped system with short-range disorder we predict the cooling power of acoustic phonons is drastically increased because of an enhanced energy transfer between electrons and phonons. When an external magnetic field is applied to an undoped system, the cooling power is linear in magnetic field strength and $T_e$ has square root decay in time, independent of magnetic field strength over a range of values.

12 pages

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Cited by in corpus (20)

• A High-Performance Mid-infrared Optical Switch Enabled by Bulk Dirac Fermions in Cd3As2
• Circumventing the no-go theorem: A single Weyl point surrounded by nodal walls
• Terahertz Probe of Photoexcited Carrier Dynamics in Dirac Semimetal Cd3As2
• Ultrafast Relaxation Dynamics of Photoexcited Dirac Fermion in The Three Dimensional Dirac Semimetal Cadmium Arsenide
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• Phonon-limited Transport and Fermi Arc Lifetime in Weyl Semimetals
• Nonequilibrium phonon dynamics beyond the quasiequilibrium approach
• Chiral magnetic effect of hot electrons
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• Tunneling in an anisotropic cubic Dirac semi-metal
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