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Anomalous Nernst Effect in the Dirac Semimetal Cd3As2

Author(s): Liang, Tian; Lin, Jingjing; Gibson, Quinn; Gao, Tong; Hirschberger, Max; et al

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Abstract: Dirac and Weyl semimetals display a host of novel properties. In Cd3As2, the Dirac nodes lead to a protection mechanism that strongly suppresses backscattering in a zero magnetic field, resulting in ultrahigh mobility (similar to 10(7) cm(2) V-1 s(-1)). In an applied magnetic field, an anomalous Nernst effect is predicted to arise from the Berry curvature associated with the Weyl nodes. We report the observation of a large anomalous Nernst effect in Cd3As2. Both the anomalous Nernst signal and transport relaxation time tau(tr) begin to increase rapidly at similar to 50 K. This suggests a close relation between the protection mechanism and the anomalous Nernst effect. In a field, the quantum oscillations of bulk states display a beating effect, suggesting that the Dirac nodes split into Weyl states, allowing the Berry curvature to be observed as an anomalous Nernst effect.
Publication Date: 31-Mar-2017
Electronic Publication Date: 29-Mar-2017
Citation: Liang, Tian, Lin, Jingjing, Gibson, Quinn, Gao, Tong, Hirschberger, Max, Liu, Minhao, Cava, RJ, Ong, NP. (2017). Anomalous Nernst Effect in the Dirac Semimetal Cd3As2. PHYSICAL REVIEW LETTERS, 118 (10.1103/PhysRevLett.118.136601
DOI: doi:10.1103/PhysRevLett.118.136601
ISSN: 0031-9007
EISSN: 1079-7114
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW LETTERS
Version: Final published version. This is an open access article.

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