Anisotropic Fano resonance in the Weyl semimetal candidate LaAlSi

Zhang, Kunyan; Wang, Tong; Pang, Xiaoqi; Han, Fei; Shang, Shun-Li; Hung, Nguyen T.; Liu, Zi-Kui; Li, Mingda; Saito, Riichiro; Huang, Shengxi

doi:10.1103/physrevb.102.235162

Title: Anisotropic Fano resonance in the Weyl semimetal candidate LaAlSi

Journal Article · Wed Dec 30 00:00:00 EST 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.102.235162· OSTI ID:1853471

^[1]; Wang, Tong ^[2]; Pang, Xiaoqi ^[2]; Han, Fei ^[3]; Shang, Shun-Li ^[1];

^[2]; Liu, Zi-Kui ^[1];

^[3]; Saito, Riichiro ^[2];

^[1]

Pennsylvania State Univ., University Park, PA (United States)
Tohoku Univ., Sendai (Japan)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Topological Weyl semimetal (WSM) is a solid-state realization of chiral Weyl fermions, whose phonon behaviors provide in-depth knowledge of their electronic properties. In this work, anisotropic Fano resonance is observed in a type-II WSM candidate LaAlSi by polarized Raman spectroscopy. The asymmetric line shape occurs for the $$B^2_1$$ phonon mode of LaAlSi only for 488- and 532-nm laser excitations but not for 364-, 633-, and 785-nm excitations, suggesting the excitation selectivity. The asymmetry, frequency, and linewidth of the $$B^2_1$$ phonon mode, along with the spectral background, all show fourfold rotational symmetry as a function of the polarization angle in the polarized Raman spectra. While the shift of Raman frequency in a metal or semimetal is typically attributed to Kohn anomaly, here we show that the anisotropic frequency shift in LaAlSi cannot be explained by the effect of Kohn anomaly, but potentially by the anisotropic scattering background of Fano resonance. Origins of the excitation-energy dependence and anisotropic behavior of the Fano resonance are discussed by the first-principles calculated electronic band structure and phonon dispersion.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0020148

OSTI ID:: 1853471

Journal Information:: Physical Review. B, Vol. 102, Issue 23; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Anisotropic Fano resonance in the Weyl semimetal candidate LaAlSi

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