Unconventional Chiral Fermions and Large Topological Fermi Arcs in RhSi

Chang, Guoqing; Xu, Su-Yang; Wieder, Benjamin J.; Sanchez, Daniel S.; Huang, Shin-Ming; Belopolski, Ilya; Chang, Tay-Rong; Zhang, Songtian; Bansil, Arun; Lin, Hsin; Hasan, M. Zahid

doi:10.1103/PhysRevLett.119.206401

Title: Unconventional Chiral Fermions and Large Topological Fermi Arcs in RhSi

Journal Article · 17 November 2017 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.119.206401 · OSTI ID:1544354

Chang, Guoqing ^[1]; Xu, Su-Yang ^[2]; Wieder, Benjamin J. ^[3]; Sanchez, Daniel S. ^[2]; Huang, Shin-Ming ^[4]; Belopolski, Ilya ^[2]; Chang, Tay-Rong ^[5]; Zhang, Songtian ^[2]; Bansil, Arun ^[6]; Lin, Hsin ^[1]; Hasan, M. Zahid ^[7]

National Univ. of Singapore (Singapore)
Princeton Univ., NJ (United States)
KTH Royal Inst. of Technology, Stockholm (Sweden)
National Sun Yat-sen Univ. (Taiwan)
National Cheng Kung Univ. (Taiwan)
Northeastern Univ., Boston, MA (United States)
Princeton Univ., NJ (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

The theoretical proposal of chiral fermions in topological semimetals has led to a significant effort towards their experimental realization. In particular, the Fermi surfaces of chiral semimetals carry quantized Chern numbers, making them an attractive platform for the observation of exotic transport and optical phenomena. Although the simplest example of a chiral fermion in condensed matter is a conventional |C|=1 Weyl fermion, recent theoretical works have proposed a number of unconventional chiral fermions beyond the standard model which are protected by unique combinations of topology and crystalline symmetries. Yet, materials candidates for experimentally probing the transport and response signatures of these unconventional fermions have thus far remained elusive. Here, we propose the RhSi family in space group No. 198 as the ideal platform for the experimental examination of unconventional chiral fermions. We find that RhSi is a filling-enforced semimetal that features near its Fermi surface a chiral double sixfold-degenerate spin-1 Weyl node at R and a previously uncharacterized fourfold-degenerate chiral fermion at Γ. Each unconventional fermion displays Chern number ±4 at the Fermi level. We also show that RhSi displays the largest possible momentum separation of compensative chiral fermions, the largest proposed topologically nontrivial energy window, and the longest possible Fermi arcs on its surface. We conclude by proposing signatures of an exotic bulk photogalvanic response in RhSi.

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Research Organization:: 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; AC02-05CH11231

OSTI ID:: 1544354

Alternate ID(s):: OSTI ID: 1409231

Journal Information:: Physical Review Letters, Vol. 119, Issue 20; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 230 works

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Linear optical conductivity of chiral multifold fermions Sánchez-Martínez, Miguel-Ángel; de Juan, Fernando; Grushin, Adolfo G. arXiv https://doi.org/10.48550/arxiv.1902.07271	text	January 2019
Multifold nodal points in magnetic materials Cano, Jennifer; Bradlyn, Barry; Vergniory, M. G. arXiv https://doi.org/10.48550/arxiv.1904.12867	text	January 2019
Cyclotron orbit knot and tunable-field quantum Hall effect Zhang, Yi arXiv https://doi.org/10.48550/arxiv.1905.02192	text	January 2019
Leveraging Electron-Phonon Interaction to Enhance Thermoelectric Power Factor in Graphene-Like Semimetals Xia, Yi; Park, Junsoo; Ozoliņš, Vidvuds arXiv https://doi.org/10.48550/arxiv.1906.00115	text	January 2019
Nonlinear Absorption and Photocurrent in Weyl Semimetals Leppenen, N. V.; Ivchenko, E. L.; Golub, L. E. arXiv https://doi.org/10.48550/arxiv.1906.00686	text	January 2019
Difference frequency generation in topological semimetals de Juan, Fernando; Zhang, Yang; Morimoto, Takahiro arXiv https://doi.org/10.48550/arxiv.1907.02537	text	January 2019
Strong and Fragile Topological Dirac Semimetals with Higher-Order Fermi Arcs Wieder, Benjamin J.; Wang, Zhijun; Cano, Jennifer arXiv https://doi.org/10.48550/arxiv.1908.00016	text	January 2019
Strong bulk photovoltaic effect in chiral crystal in the visible spectrum Zhang, Yang; de Juan, Fernando; Grushin, Adolfo G. arXiv https://doi.org/10.48550/arxiv.1908.08878	text	January 2019
The study of magnetic topological semimetals by first principles calculations Zou, Jinyu; He, Zhuoran; Xu, Gang arXiv https://doi.org/10.48550/arxiv.1909.11999	text	January 2019
Angle-resolved photoemission spectroscopy and its application to topological materials Lv, Baiqing; Qian, Tian; Ding, Hong arXiv https://doi.org/10.48550/arxiv.2106.09797	text	January 2021

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