Dirac dispersion generates large Nernst effect in Weyl semimetals

Abstract

Weyl semimetals expand research on topologically protected transport by adding bulk Berry monopoles with linearly dispersing electronic states and topologically robust, gapless surface Fermi arcs terminating on bulk node projections. Here, we show how the Nernst effect, combining entropy with charge transport, gives a unique signature for the presence of Dirac bands. The Nernst thermopower of NbP (maximum of 800 microV K-1 at 9 T, 109 K) exceeds its conventional thermopower by a hundredfold and is significantly larger than the thermopower of traditional thermoelectric materials. The Nernst effect has a pronounced maximum near T_M=90 +/- 20 K=mu_0/kB (mu_0 is chemical potential at T=0 K). A self-consistent theory without adjustable parameters shows that this results from electrochemical potential pinning to the Weyl point energy at T>=TM, driven by charge neutrality and Dirac band symmetry. Temperature and field dependences of the Nernst effect, an even function of the charge polarity, result from the intrinsically bipolar nature of the Weyl fermions. Through this study, we offer an understanding of the temperature dependence of the position of the electrochemical potential vis-a-vis the Weyl point, and we show a direct connection between topology and the Nernst effect, a potentially robust experimental tool for investigating topological states and the chiral anomaly.

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Cited by in corpus (58)

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• Berry curvature unravelled by the Nernst effect in Mn${}_3$Ge
• Quantized Thermoelectric Hall Effect Induces Giant Power Factor in a Topological Semimetal
• Large Nernst Power Factor over a Broad Temperature Range in Polycrystalline Weyl Semimetal NbP
• Unconventional transverse transport above and below the magnetic transition temperature in Weyl semimetal EuCd${}_2$As${}_2$
• Anomalous thermoelectric effects of ZrTe${}_5$ in and beyond the quantum limit
• Anomalous thermoelectric effects and quantum oscillations in the kagome metal CsV${}_3$Sb${}_5$
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• Planar Hall effect in topological Weyl and nodal line semimetals
• Large Nernst effect and field enhanced transversal ZT in ZrTe5
• Thermoelectric Hall conductivity and figure of merit in Dirac/Weyl materials
• Enhanced anomalous Nernst effect in disordered Dirac and Weyl materials
• Magneto-transport phenomena of type-I multi-Weyl semimetals in co-planar setups
• Role of time reversal symmetry and tilting in circular photogalvanic responses
• Thermo-electric transport properties of Floquet multi-Weyl Semimetals
• Chiral anomaly induced nonlinear Nernst and thermal Hall effects in Weyl semimetals
• Thermal Transport for Probing Quantum Materials
• Electronic structure and unconventional non-linear response in double Weyl semimetal SrSi${}_2$
• Understanding the three-dimensional quantum Hall effect in generic multi-Weyl semimetals
• Giant magnetoresistance and topological Hall effect in the EuGa4 antiferromagnet
• Fingerprints of the conformal anomaly on the thermoelectric transport in Dirac and Weyl semimetals: Result from a Kubo formula
• Electric and thermoelectric response for Weyl and multi-Weyl semimetals in planar Hall configurations including the effects of strain
• Magneto-transport signatures in periodically-driven Weyl and multi-Weyl semimetals
• Photo-induced tunable Anomalous Hall and Nernst effects in tilted Weyl Semimetals using Floquet theory
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• Direction-dependent conductivity in planar Hall set-ups with tilted Weyl/multi-Weyl semimetals
• Distinct signatures of particle-hole symmetry breaking in transport coefficients for generic multi-Weyl semimetals
• Imaging the Ettingshausen effect and cryogenic thermoelectric cooling in a van der Waals semimetal
• Enhancing thermopower and Nernst signal of high-mobility Dirac carriers by Fermi level tuning in the layered magnet EuMnBi${}_2$
• Large enhancement of thermopower at low magnetic field in compensated semimetals
• Linear response in planar Hall and thermal Hall setups for Rarita-Schwinger-Weyl semimetals
• Severe violation of the Wiedemann-Franz law in quantum oscillations of NbP
• Planar Hall Plateau in Magnetic Weyl Semimetals
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• Large Nernst Effect in a layered metallic antiferromagnet EuAl${}_2$Si${}_2$
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• Nernst Thermopower of Time-Reversal Breaking Type-II Weyl Semimetals
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• Thermoelectric evidence of the electronic structure changes from the charge-density-wave transition in FeGe
• Design Principles for Topological Thermoelectrics
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