Physics

Rational design of large anomalous Nernst effect in Dirac semimetals

P. Wang, Z. Hu, et al.

This research conducted by Panshuo Wang, Zongxiang Hu, Xiaosong Wu, and Qihang Liu unveils a significant enhancement in anomalous Nernst conductivity (ANC) with Dirac nodes in a Zeeman field, surpassing traditional Weyl semimetals. With first-principles calculations indicating impressive ANC values, this work sets a new design principle for optimizing electronic structures.

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Abstract

This work theoretically demonstrates that a pair of Dirac nodes under a Zeeman field enhances anomalous Nernst conductivity (ANC) compared to Weyl semimetals. First-principles calculations on Na₃Bi and NaTeAu show sizable ANC values (0.4 Am⁻¹K⁻¹ and 1.3 Am⁻¹K⁻¹, respectively). A hypothetical alloy, NaFeTe₂Au₂, exhibits an even higher ANC (3.7 Am⁻¹K⁻¹). This research provides a design principle for enhancing ANC by manipulating electronic structure.

Publisher

npj Computational Materials

Published On

Oct 27, 2023

Authors

Panshuo Wang, Zongxiang Hu, Xiaosong Wu, Qihang Liu

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