Increasing the number of topological nodal lines in semimetals via uniaxial pressure

Abstract The application of pressure has been demonstrated to induce intriguing phase transitions in topological nodal-line semimetals. In this work we analyze how uniaxial pressure affects the topological character of BaSn $$_2$$ 2 , a Dirac nodal-line semimetal in the absence of spin-orbit couplin...

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Autores principales:	Adolfo O. Fumega, Victor Pardo, A. Cortijo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/07fd10f48f9a48868c3ea2042aacac9a
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spelling	oai:doaj.org-article:07fd10f48f9a48868c3ea2042aacac9a2021-12-02T15:45:31ZIncreasing the number of topological nodal lines in semimetals via uniaxial pressure10.1038/s41598-021-90165-y2045-2322https://doaj.org/article/07fd10f48f9a48868c3ea2042aacac9a2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90165-yhttps://doaj.org/toc/2045-2322Abstract The application of pressure has been demonstrated to induce intriguing phase transitions in topological nodal-line semimetals. In this work we analyze how uniaxial pressure affects the topological character of BaSn $$_2$$ 2 , a Dirac nodal-line semimetal in the absence of spin-orbit coupling. Using calculations based on the density functional theory and a model tight-binding Hamiltonian, we find the emergence of a second nodal line for pressures higher than 4 GPa. We examine the topological features of both phases demonstrating that a nontrivial character is present in both of them. Thus, providing evidence of a topological-to-topological phase transition in which the number of topological nodal lines increases. The orbital overlap increase between Ba $$d_{xz}$$ d xz and $$d_{yz}$$ d yz orbitals and Sn $$p_z$$ p z orbitals and the preservation of crystal symmetries are found to be responsible for the advent of this transition. Furthermore, we pave the way to experimentally test this kind of transition by obtaining a topological relation between the zero-energy modes that arise in each phase when a magnetic field is applied.Adolfo O. FumegaVictor PardoA. CortijoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Adolfo O. Fumega Victor Pardo A. Cortijo Increasing the number of topological nodal lines in semimetals via uniaxial pressure
description	Abstract The application of pressure has been demonstrated to induce intriguing phase transitions in topological nodal-line semimetals. In this work we analyze how uniaxial pressure affects the topological character of BaSn $$_2$$ 2 , a Dirac nodal-line semimetal in the absence of spin-orbit coupling. Using calculations based on the density functional theory and a model tight-binding Hamiltonian, we find the emergence of a second nodal line for pressures higher than 4 GPa. We examine the topological features of both phases demonstrating that a nontrivial character is present in both of them. Thus, providing evidence of a topological-to-topological phase transition in which the number of topological nodal lines increases. The orbital overlap increase between Ba $$d_{xz}$$ d xz and $$d_{yz}$$ d yz orbitals and Sn $$p_z$$ p z orbitals and the preservation of crystal symmetries are found to be responsible for the advent of this transition. Furthermore, we pave the way to experimentally test this kind of transition by obtaining a topological relation between the zero-energy modes that arise in each phase when a magnetic field is applied.
format	article
author	Adolfo O. Fumega Victor Pardo A. Cortijo
author_facet	Adolfo O. Fumega Victor Pardo A. Cortijo
author_sort	Adolfo O. Fumega
title	Increasing the number of topological nodal lines in semimetals via uniaxial pressure
title_short	Increasing the number of topological nodal lines in semimetals via uniaxial pressure
title_full	Increasing the number of topological nodal lines in semimetals via uniaxial pressure
title_fullStr	Increasing the number of topological nodal lines in semimetals via uniaxial pressure
title_full_unstemmed	Increasing the number of topological nodal lines in semimetals via uniaxial pressure
title_sort	increasing the number of topological nodal lines in semimetals via uniaxial pressure
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/07fd10f48f9a48868c3ea2042aacac9a
work_keys_str_mv	AT adolfoofumega increasingthenumberoftopologicalnodallinesinsemimetalsviauniaxialpressure AT victorpardo increasingthenumberoftopologicalnodallinesinsemimetalsviauniaxialpressure AT acortijo increasingthenumberoftopologicalnodallinesinsemimetalsviauniaxialpressure
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Increasing the number of topological nodal lines in semimetals via uniaxial pressure

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