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Discovery of Lorentz-violating type II Weyl fermions in LaAlGe

In quantum field theory, Weyl fermions are relativistic particles that travel at the speed of light and strictly obey the celebrated Lorentz symmetry. Their low-energy condensed matter analogs are Weyl semimetals, which are conductors whose electronic excitations mimic the Weyl fermion equation of m...

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Autores principales: Xu, Su-Yang, Alidoust, Nasser, Chang, Guoqing, Lu, Hong, Singh, Bahadur, Belopolski, Ilya, Sanchez, Daniel S., Zhang, Xiao, Bian, Guang, Zheng, Hao, Husanu, Marious-Adrian, Bian, Yi, Huang, Shin-Ming, Hsu, Chuang-Han, Chang, Tay-Rong, Jeng, Horng-Tay, Bansil, Arun, Neupert, Titus, Strocov, Vladimir N., Lin, Hsin, Jia, Shuang, Hasan, M. Zahid
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5457030/
https://www.ncbi.nlm.nih.gov/pubmed/28630919
http://dx.doi.org/10.1126/sciadv.1603266
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author Xu, Su-Yang
Alidoust, Nasser
Chang, Guoqing
Lu, Hong
Singh, Bahadur
Belopolski, Ilya
Sanchez, Daniel S.
Zhang, Xiao
Bian, Guang
Zheng, Hao
Husanu, Marious-Adrian
Bian, Yi
Huang, Shin-Ming
Hsu, Chuang-Han
Chang, Tay-Rong
Jeng, Horng-Tay
Bansil, Arun
Neupert, Titus
Strocov, Vladimir N.
Lin, Hsin
Jia, Shuang
Hasan, M. Zahid
author_facet Xu, Su-Yang
Alidoust, Nasser
Chang, Guoqing
Lu, Hong
Singh, Bahadur
Belopolski, Ilya
Sanchez, Daniel S.
Zhang, Xiao
Bian, Guang
Zheng, Hao
Husanu, Marious-Adrian
Bian, Yi
Huang, Shin-Ming
Hsu, Chuang-Han
Chang, Tay-Rong
Jeng, Horng-Tay
Bansil, Arun
Neupert, Titus
Strocov, Vladimir N.
Lin, Hsin
Jia, Shuang
Hasan, M. Zahid
author_sort Xu, Su-Yang
collection PubMed
description In quantum field theory, Weyl fermions are relativistic particles that travel at the speed of light and strictly obey the celebrated Lorentz symmetry. Their low-energy condensed matter analogs are Weyl semimetals, which are conductors whose electronic excitations mimic the Weyl fermion equation of motion. Although the traditional (type I) emergent Weyl fermions observed in TaAs still approximately respect Lorentz symmetry, recently, the so-called type II Weyl semimetal has been proposed, where the emergent Weyl quasiparticles break the Lorentz symmetry so strongly that they cannot be smoothly connected to Lorentz symmetric Weyl particles. Despite some evidence of nontrivial surface states, the direct observation of the type II bulk Weyl fermions remains elusive. We present the direct observation of the type II Weyl fermions in crystalline solid lanthanum aluminum germanide (LaAlGe) based on our photoemission data alone, without reliance on band structure calculations. Moreover, our systematic data agree with the theoretical calculations, providing further support on our experimental results.
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spelling pubmed-54570302017-06-19 Discovery of Lorentz-violating type II Weyl fermions in LaAlGe Xu, Su-Yang Alidoust, Nasser Chang, Guoqing Lu, Hong Singh, Bahadur Belopolski, Ilya Sanchez, Daniel S. Zhang, Xiao Bian, Guang Zheng, Hao Husanu, Marious-Adrian Bian, Yi Huang, Shin-Ming Hsu, Chuang-Han Chang, Tay-Rong Jeng, Horng-Tay Bansil, Arun Neupert, Titus Strocov, Vladimir N. Lin, Hsin Jia, Shuang Hasan, M. Zahid Sci Adv Research Articles In quantum field theory, Weyl fermions are relativistic particles that travel at the speed of light and strictly obey the celebrated Lorentz symmetry. Their low-energy condensed matter analogs are Weyl semimetals, which are conductors whose electronic excitations mimic the Weyl fermion equation of motion. Although the traditional (type I) emergent Weyl fermions observed in TaAs still approximately respect Lorentz symmetry, recently, the so-called type II Weyl semimetal has been proposed, where the emergent Weyl quasiparticles break the Lorentz symmetry so strongly that they cannot be smoothly connected to Lorentz symmetric Weyl particles. Despite some evidence of nontrivial surface states, the direct observation of the type II bulk Weyl fermions remains elusive. We present the direct observation of the type II Weyl fermions in crystalline solid lanthanum aluminum germanide (LaAlGe) based on our photoemission data alone, without reliance on band structure calculations. Moreover, our systematic data agree with the theoretical calculations, providing further support on our experimental results. American Association for the Advancement of Science 2017-06-02 /pmc/articles/PMC5457030/ /pubmed/28630919 http://dx.doi.org/10.1126/sciadv.1603266 Text en Copyright © 2017, The Authors http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Xu, Su-Yang
Alidoust, Nasser
Chang, Guoqing
Lu, Hong
Singh, Bahadur
Belopolski, Ilya
Sanchez, Daniel S.
Zhang, Xiao
Bian, Guang
Zheng, Hao
Husanu, Marious-Adrian
Bian, Yi
Huang, Shin-Ming
Hsu, Chuang-Han
Chang, Tay-Rong
Jeng, Horng-Tay
Bansil, Arun
Neupert, Titus
Strocov, Vladimir N.
Lin, Hsin
Jia, Shuang
Hasan, M. Zahid
Discovery of Lorentz-violating type II Weyl fermions in LaAlGe
title Discovery of Lorentz-violating type II Weyl fermions in LaAlGe
title_full Discovery of Lorentz-violating type II Weyl fermions in LaAlGe
title_fullStr Discovery of Lorentz-violating type II Weyl fermions in LaAlGe
title_full_unstemmed Discovery of Lorentz-violating type II Weyl fermions in LaAlGe
title_short Discovery of Lorentz-violating type II Weyl fermions in LaAlGe
title_sort discovery of lorentz-violating type ii weyl fermions in laalge
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5457030/
https://www.ncbi.nlm.nih.gov/pubmed/28630919
http://dx.doi.org/10.1126/sciadv.1603266
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