Chiral magnetic photocurrent in Dirac and Weyl materials

Kaushik, Sahal; Kharzeev, Dmitri E.; Philip, Evan John

doi:10.1103/PhysRevB.99.075150

Chiral magnetic photocurrent in Dirac and Weyl materials

Journal Article · Sun Feb 24 23:00:00 EST 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.075150· OSTI ID:1496878

Kaushik, Sahal ^[1]; ^[2]; ^[3]

Stony Brook Univ., NY (United States); Stony Brook University, Stony Brook, NY
Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Stony Brook Univ., NY (United States)

Circularly polarized light (CPL) can induce an asymmetry between the number of left- and right-handed chiral quasiparticles in Dirac and Weyl semimetals. Here, we show that if the photoresponse of the material is dominated by chiral quasiparticles, the total chiral charge induced in the material by CPL can be evaluated in a model-independent way through the chiral anomaly. In the presence of an external magnetic field perpendicular to the incident CPL, this allows us to predict the linear density of the induced photocurrent resulting from the chiral magnetic effect. The predicted effect should exist in any kind of Dirac or Weyl materials, with both symmetric and asymmetric band structure. An estimate of the resulting chiral magnetic photocurrent in a typical Dirac semimetal irradiated by an infrared laser of intensity ≃5×10⁶W/m² and a wavelength of λ≃10μm in an external magnetic field B≃2T yields a current J≃50nA in the laser spot of size ≃50μm. Here, this current scales linearly with the magnetic field and wavelength, opening up possibilities for applications in photonics, optoelectronics, and THz sensing.

View Accepted Manuscript (DOE)

Research Organization:: Stony Brook Univ., NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

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

Grant/Contract Number:: SC0017662

OSTI ID:: 1496878

Alternate ID(s):: OSTI ID: 1503518
OSTI ID: 1806562
OSTI ID: 1546162

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 7 Vol. 99; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Chiral magnetic photocurrent in Dirac and Weyl materials

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