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Observation of nodal-arcs, effect of axial strain on the nodal-lines & Weyl nodes and low-temperature finite value of Seebeck coefficient in TaAs class of Weyl semimetals

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arXiv:2403.18169v1 Announce Type: new
Abstract: This work verifies the SOC-induced evolution of \textit{nodal-arcs} into Weyl nodes under the effect of spin-orbit coupling (SOC) in NbAs \& NbP. The obtained features mimics the observations as reported for TaAs \& TaP in our previous work\cite{pandey2023existence}. In addition, this work reports that the number of nodes in TaAs class of Weyl semimetals (WSMs) can be altered via creating strain along $a$ or $c$ direction of the crystal. For instance, the number of nodes in NbAs under SOC-effect along with 2\% (3\%) compressive-strain in $a$ direction is found to be 20 (28). Besides the nodes, such strain are found to have considerable impact on the nodal-rings of these WSMs when effect of SOC is ignored. Apart from this, the work discusses the role of Weyl physics in affecting the Seebeck coefficient of any WSM. In this direction, it is discussed that how a symmetric Weyl cone, even if tilted, have no contribution to the Seebeck of WSMs. Furthermore, the work highlights the conditions under which a Weyl cone can contribute to the Seebeck coefficient of a given WSM. Lastly, the discussion of Weyl contribution to Seebeck is validated over TaAs class of WSMs via investigating the features of its Weyl cones and calculating the contributions of these cones to the Seebeck coefficient of these semimetals. The value of $S$ contributed from Weyl cone is found to be as large as $\sim$65 $\mu$\textit{V}/\textit{K} below 25 K in case of TaAs. The findings of this work present a possibility of engineering the topological properties of TaAs class of WSMs via creating strain in their crystal. It also makes the picture of Weyl physics\textquoteright\hspace{0.1cm} impact on the Seebeck coefficient of WSMs a more clear.

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