Optical evidence of the chiral magnetic anomaly in the Weyl semimetal TaAs

Levy, A. L.; Sushkov, A. B.; Liu, Fengguang; Shen, Bing; Ni, Ni; Drew, H. D.; Jenkins, G. S.

doi:10.1103/physrevb.101.125102

Optical evidence of the chiral magnetic anomaly in the Weyl semimetal TaAs

Journal Article · Tue Mar 03 23:00:00 EST 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.101.125102· OSTI ID:1801690

Levy, A. L. ^[1]; Sushkov, A. B. ^[2]; Liu, Fengguang ^[3]; Shen, Bing ^[4]; Ni, Ni ^[4]; Drew, H. D. ^[2]; Jenkins, G. S. ^[5]

Univ. of Maryland, College Park, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); OSTI
Univ. of Maryland, College Park, MD (United States)
Univ. of Maryland, College Park, MD (United States); Anhui Agricultural University, Hefei (China)
Univ. of California, Los Angeles, CA (United States)
Laboratory for the Physical Sciences, College Park, MD (United States)

Chiral pumping from optical electric fields oscillating at terahertz frequencies is observed in the Weyl material TaAs with electric and magnetic fields aligned along both the $$\textit{a}$$ and $$\textit{c}$$ axes. In this work, free-carrier spectral weight enhancement is measured directly, confirming theoretical expectations of chiral pumping. A departure from linear field dependence of the Drude weight is observed at the highest fields in the quantum limit, providing evidence of field-dependent Fermi velocity of the chiral Landau level. Implications for the chiral magnetic effect in Weyl semimetals from the optical $$\textit{f}$$-sum rule are discussed.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Maryland, College Park, MD (United States); Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); China Scholarship Council (CSC)

Grant/Contract Number:: SC0005436; SC0011978

OSTI ID:: 1801690

Alternate ID(s):: OSTI ID: 1603197

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 101; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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