Soft phonons and ultralow lattice thermal conductivity in the Dirac semimetal Cd3As2

Abstract

Recently, Cd3As2 has attracted intensive research interest as an archetypical Dirac semimetal, hosting three-dimensional linear-dispersive electronic bands near the Fermi level. Previous studies have shown that single-crystalline Cd3As2 has an anomalously low lattice thermal conductivity, ranging from 0.3 W/mK to 0.7 W/mK at 300 K, which has been attributed to point defects. In this work, we combine first-principles lattice dynamics calculations and temperature-dependent high-resolution Raman spectroscopy of high-quality single-crystal thin films grown by molecular beam epitaxy to reveal the existence of a group of soft optical phonon modes at the Brillouin zone center of Cd3As2. These soft phonon modes significantly increase the scattering phase space of heat-carrying acoustic phonons and are the origin of the low lattice thermal conductivity of Cd3As2. Furthermore, we show that the interplay between the phonon-phonon Umklapp scattering rates and the soft optical phonon frequency explains the unusual non-monotonic temperature dependence of the lattice thermal conductivity of Cd3As2. Our results further suggest that the soft phonon modes are potentially induced by a Kohn anomaly associated with the Dirac nodes, in analogy to similar, nonetheless weaker, effects in graphene and Weyl semimetals.

7 pages, 4 figure. Comments are welcome

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• Probing charge pumping and relaxation of the chiral anomaly in a Dirac semimetal
• Phonon softening near topological phase transitions
• Topological surface states in strained Dirac semimetal thin films
• $\beta$-As${}_2$Te${}_3$: Pressure-Induced 3D Dirac Semi-Metal
• Phonon helicity and Nieh-Yan Anomaly in the Kramers-Weyl semimetals of Chiral Crystals
• Anomalous electronic energy relaxation and soft phonons in the Dirac semimetal Cd${}_3$As${}_2$
• Doping Topological Dirac Semimetal with magnetic impurities: electronic structure of Mn-doped Cd${}_3$As${}_2$
• Enhancement of the Thermoelectric Figure of Merit in the Dirac Semimetal Cd${}_3$As${}_2$ by Band-Structure and -Filling Control