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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...
Autores principales: | , , , , , , , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2017
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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. |
format | Online Article Text |
id | pubmed-5457030 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
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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