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Anomalous Nernst and thermal Hall effects in tilted Weyl semimetals
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 11, article id 115202Article in journal (Refereed) Published
Abstract [en]

We study the anomalous Nernst and thermal Hall effects in a linearized low-energy model of a tilted Weyl semimetal, with two Weyl nodes separated in momentum space. For inversion symmetric tilt, we give analytic expressions in two opposite limits: For a small tilt, corresponding to a type-I Weyl semimetal, the Nernst conductivity is finite and independent of the Fermi level; for a large tilt, corresponding to a type-II Weyl semimetal, it acquires a contribution depending logarithmically on the Fermi energy. This result is in a sharp contrast to the nontilted case, where the Nernst response is known to be zero in the linear model. The thermal Hall conductivity similarly acquires Fermi surface contributions, which add to the Fermi level-independent, zero-tilt result, and is suppressed as one over the tilt parameter at half filling in the type-II phase. In the case of inversion-breaking tilt, with the tilting vector of equal modulus in the two Weyl cones, all Fermi surface contributions to both anomalous responses cancel out, resulting in zero Nernst conductivity. We discuss two possible experimental setups, representing open and closed thermoelectric circuits.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 96, no 11, article id 115202
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-214875DOI: 10.1103/PhysRevB.96.115202ISI: 000410001400004Scopus ID: 2-s2.0-85030120296OAI: oai:DiVA.org:kth-214875DiVA, id: diva2:1151465
Note

QC 20171023

Available from: 2017-10-23 Created: 2017-10-23 Last updated: 2017-11-29Bibliographically approved

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