Semi-Dirac Fermions in a Topological Metal

Shao, Yinming; Moon, Seongphill; Rudenko, A. N.; Wang, Jie; Herzog-Arbeitman, Jonah; Ozerov, Mykhaylo; Graf, David; Sun, Zhiyuan; Queiroz, Raquel; Lee, Seng Huat; Zhu, Yanglin; Mao, Zhiqiang; Katsnelson, M. I.; Bernevig, B. Andrei; Smirnov, Dmitry; Millis, Andrew J.; Basov, D. N.

doi:10.1103/PhysRevX.14.041057

Title: Semi-Dirac Fermions in a Topological Metal

Journal Article · 05 December 2024 · Physical Review. X

DOI: https://doi.org/10.1103/PhysRevX.14.041057 · OSTI ID:2479931

; Moon, Seongphill;

;

; Graf, David;

; Queiroz, Raquel; Lee, Seng Huat; Zhu, Yanglin; Mao, Zhiqiang;

; Bernevig, B. Andrei;

; Millis, Andrew J.; Basov, D. N.

Topological semimetals with massless Dirac and Weyl fermions represent the forefront of quantum materials research. In two dimensions, a peculiar class of fermions that are massless in one direction and massive in the perpendicular direction was predicted 16 years ago. These highly exotic quasiparticles—the semi-Dirac fermions—ignited intense theoretical and experimental interest but remain undetected. Using magneto-optical spectroscopy, we demonstrate the defining feature of semi-Dirac fermions— $B^{2 / 3}$ scaling of Landau levels—in a prototypical nodal-line metal ZrSiS. In topological metals, including ZrSiS, nodal lines extend the band degeneracies from isolated points to lines, loops, or even chains in the momentum space. With calculations and theoretical modeling, we pinpoint the observed semi-Dirac spectrum to the crossing points of nodal lines in ZrSiS. Crossing nodal lines exhibit a continuum absorption spectrum but with singularities that scale as $B^{2 / 3}$ at the crossing. Our work sheds light on the hidden quasiparticles emerging from the intricate topology of crossing nodal lines and highlights the potential to explore quantum geometry with linear optical responses. Published by the American Physical Society 2024

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

Grant/Contract Number:: SC0019443

OSTI ID:: 2479931

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Journal Issue: 4 Vol. 14; ISSN PRXHAE; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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