Influence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal

Abstract Most theoretical studies of tunneling in Dirac and the closely related Weyl semimetals have modeled these materials as single Weyl nodes described by the three-dimensional Dirac equation $${\boldsymbol{H}}{\boldsymbol{=}}{{\boldsymbol{v}}}_{{\boldsymbol{f}}}\overrightarrow{{\boldsymbol{p}}}...

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Autores principales:	Zhuo Bin Siu, Can Yesilyurt, Mansoor B. A. Jalil, Seng Ghee Tan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0d31ae788a6b45ea992916cc5b85a735
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spelling	oai:doaj.org-article:0d31ae788a6b45ea992916cc5b85a7352021-12-02T15:04:54ZInfluence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal10.1038/s41598-017-03991-42045-2322https://doaj.org/article/0d31ae788a6b45ea992916cc5b85a7352017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03991-4https://doaj.org/toc/2045-2322Abstract Most theoretical studies of tunneling in Dirac and the closely related Weyl semimetals have modeled these materials as single Weyl nodes described by the three-dimensional Dirac equation $${\boldsymbol{H}}{\boldsymbol{=}}{{\boldsymbol{v}}}_{{\boldsymbol{f}}}\overrightarrow{{\boldsymbol{p}}}\cdot \overrightarrow{{\boldsymbol{\sigma }}}$$ H = v f p → ⋅ σ → . The influence of scattering between the different valleys centered around different Weyl nodes, and the Fermi arc states which connect these nodes are hence not evident from these studies. In this work we study the tunneling in a thin film system of the Dirac semimetal Na3Bi consisting of a central segment with a gate potential, sandwiched between identical semi-infinite source and drain segments. The model Hamiltonian we use for Na3Bi gives, for each spin, two Weyl nodes separated in k-space symmetrically about k z = 0. The presence of a top and bottom surface in the thin film geometry results in the appearance of Fermi arc states and energy subbands. We show that (for each spin) the presence of two Weyl nodes and the Fermi arc states results in enhanced transmission oscillations, and finite transmission even when the energy falls within the bulk band gap in the central segment respectively. These features are not captured in single Weyl node models.Zhuo Bin SiuCan YesilyurtMansoor B. A. JalilSeng Ghee TanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zhuo Bin Siu Can Yesilyurt Mansoor B. A. Jalil Seng Ghee Tan Influence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal
description	Abstract Most theoretical studies of tunneling in Dirac and the closely related Weyl semimetals have modeled these materials as single Weyl nodes described by the three-dimensional Dirac equation $${\boldsymbol{H}}{\boldsymbol{=}}{{\boldsymbol{v}}}_{{\boldsymbol{f}}}\overrightarrow{{\boldsymbol{p}}}\cdot \overrightarrow{{\boldsymbol{\sigma }}}$$ H = v f p → ⋅ σ → . The influence of scattering between the different valleys centered around different Weyl nodes, and the Fermi arc states which connect these nodes are hence not evident from these studies. In this work we study the tunneling in a thin film system of the Dirac semimetal Na3Bi consisting of a central segment with a gate potential, sandwiched between identical semi-infinite source and drain segments. The model Hamiltonian we use for Na3Bi gives, for each spin, two Weyl nodes separated in k-space symmetrically about k z = 0. The presence of a top and bottom surface in the thin film geometry results in the appearance of Fermi arc states and energy subbands. We show that (for each spin) the presence of two Weyl nodes and the Fermi arc states results in enhanced transmission oscillations, and finite transmission even when the energy falls within the bulk band gap in the central segment respectively. These features are not captured in single Weyl node models.
format	article
author	Zhuo Bin Siu Can Yesilyurt Mansoor B. A. Jalil Seng Ghee Tan
author_facet	Zhuo Bin Siu Can Yesilyurt Mansoor B. A. Jalil Seng Ghee Tan
author_sort	Zhuo Bin Siu
title	Influence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal
title_short	Influence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal
title_full	Influence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal
title_fullStr	Influence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal
title_full_unstemmed	Influence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal
title_sort	influence of fermi arc states and double weyl node on tunneling in a dirac semimetal
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0d31ae788a6b45ea992916cc5b85a735
work_keys_str_mv	AT zhuobinsiu influenceoffermiarcstatesanddoubleweylnodeontunnelinginadiracsemimetal AT canyesilyurt influenceoffermiarcstatesanddoubleweylnodeontunnelinginadiracsemimetal AT mansoorbajalil influenceoffermiarcstatesanddoubleweylnodeontunnelinginadiracsemimetal AT senggheetan influenceoffermiarcstatesanddoubleweylnodeontunnelinginadiracsemimetal
_version_	1718388998652559360

Influence of Fermi arc states and double Weyl node on tunneling in a Dirac semimetal

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