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

doi:10.1126/sciadv.1603266

Title: Discovery of Lorentz-violating type II Weyl fermions in LaAlGe

Journal Article · Fri Jun 02 00:00:00 EDT 2017 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1603266· OSTI ID:1473922

Xu, Su -Yang ^[1]; Alidoust, Nasser ^[2];

^[3]; Lu, Hong ^[4];

^[3]; Belopolski, Ilya ^[1]; Sanchez, Daniel S. ^[1]; Zhang, Xiao ^[4]; Bian, Guang ^[5]; Zheng, Hao ^[1];

^[6]; Bian, Yi ^[4];

^[7];

^[3];

^[8]; Jeng, Horng -Tay ^[9]; Bansil, Arun ^[10]; Neupert, Titus ^[11]; Strocov, Vladimir N. ^[12];

^[3] more »

Princeton Univ., Princeton, NJ (United States)
Princeton Univ., Princeton, NJ (United States); Rigetti & Co Inc., Berkeley, CA (United States)
National Univ. of Singapore (Singapore)
Peking Univ., Beijing (China)
Princeton Univ., Princeton, NJ (United States); Univ. of Missouri, Columbia, MO (United States)
Paul Scherrer Inst. (PSI), Villigen (Switzerland); National Institute of Materials Physics, Magurele (Romania)
National Univ. of Singapore (Singapore); National Sun Yat-Sen Univ., Kaohsiung (Taiwan)
National Tsing Hua Univ., Hsinchu (Taiwan); National Cheng Kung Univ., Tainan (Taiwan)
National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
Northeastern Univ., Boston, MA (United States)
Univ. of Zurich, Winterthurerstrasse (Switzerland)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

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. Furthermore, our systematic data agree with the theoretical calculations, providing further support on our experimental results.

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Research Organization:: Northeastern Univ., Boston, MA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-07ER46352; FG02-05ER46200; AC02-05CH11231

OSTI ID:: 1473922

Journal Information:: Science Advances, Vol. 3, Issue 6; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 146 works

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NbSeTe -A New Layered Transition Metal Dichalcogenide Superconductor Yan, Dong; Wang, Shu; Lin, Yishi arXiv https://doi.org/10.48550/arxiv.1907.02243	text	January 2019
Polar and phase domain walls with conducting interfacial states in a Weyl semimetal MoTe2 Huang, Fei-Ting; Lim, Seong Joon; Singh, Sobhit arXiv https://doi.org/10.48550/arxiv.1908.03082	text	January 2019
Transition from Intrinsic to Extrinsic Anomalous Hall Effect in the Ferromagnetic Weyl Semimetal PrAlGe$_{1-x}$Si$_x$ Yang, Hung-Yu; Singh, Bahadur; Lu, Baozhu arXiv https://doi.org/10.48550/arxiv.1910.09697	text	January 2019
Realization of a Type-II Nodal-Line Semimetal in Mg ₃ Bi ₂ Chang, Tay-Rong; Pletikosic, Ivo; Kong, Tai Advanced Science, Vol. 6, Issue 4 https://doi.org/10.1002/advs.201800897	journal	November 2018
Positive magnetoresistance and chiral anomaly in exfoliated type-II Weyl semimetal $T_\mathrm{d}$-WTe$_{2}$ Adhikari, R.; Adhikari, S.; Faina, B. arXiv https://doi.org/10.48550/arxiv.2103.16326	preprint	January 2021

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