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Title: Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP

Journal Article · · Physical Review B
 [1];  [2];  [2];  [3];  [4]; ORCiD logo [2];  [5];  [4];  [3]; ORCiD logo [2]; ORCiD logo [4]
  1. Pennsylvania State Univ., University Park, PA (United States); OSTI
  2. Tohoku Univ., Sendai (Japan)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Pennsylvania State Univ., University Park, PA (United States)
  5. Tohoku Univ., Sendai (Japan); Indonesian Institute of Sciences, Tangerang Selatan (Indonesia)

Topological Weyl semimetals (WSMs) have attracted widespread interest due to the chiral Weyl fermions and surface Fermi arcs that enable unique optical and transport phenomena. In this work, we present angle-resolved Raman spectroscopy of TaP, a prototypical noncentrosymmetric WSM, for five excitation wavelengths ranging from 364 to 785 nm. The Raman-active modes, $$A_1$$, $$B^1_1$$, and $$B^2_1$$ modes, exhibit two main unique features beyond the conventional Raman theory. First, the relative intensities of Raman-active modes change as a function of the excitation wavelength. Second, angle-resolved polarized Raman spectra show systematic deviation from the Raman tensor theory. In particular, the $$B^1_1$$ mode is absent for 633-nm excitation, whereas the $$B^2_1$$ mode shows an unusual twofold symmetry instead of a fourfold symmetry for 488-, 532-, and 633-nm excitations. Finally, these unconventional phenomena are attributed to the interference effect in the Raman process owing to the existence of multiple carrier pockets with almost the same energy but different symmetries.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0020148
OSTI ID:
1803914
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 101; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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