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  Chiral pumping effect induced by rotating electric fields

Ebihara, S., Fukushima, K., & Oka, T. (2016). Chiral pumping effect induced by rotating electric fields. Physical Review B, 93(15): 155107, pp. 1-6. doi:10.1103/PhysRevB.93.155107.

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 Creators:
Ebihara, Shu1, Author
Fukushima, Kenji1, Author
Oka, Takashi2, Author           
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: We propose an experimental setup using 3D Dirac semimetals to access a novel phenomenon induced by the chiral anomaly. We show that the combination of a magnetic field and a circularly polarized laser induces a finite charge density with an accompanying axial current. This is because the circularly polarized laser breaks time-reversal symmetry and the Dirac point splits into two Weyl points, which results in an axial-vector field. We elucidate the appearance of the axial-vector field with the help of the Floquet theory by deriving an effective Hamiltonian for high-frequency electric fields. This anomalous charge density, i.e., the chiral pumping effect, is a phenomenon reminiscent of the chiral magnetic effect with a chiral chemical potential. We explicitly compute the pumped density and the axial-current expectation value. We also take account of coupling to the chiral magnetic effect to calculate a balanced distribution of charge and chirality in a material that behaves as a chiral battery.

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Language(s): eng - English
 Dates: 2016-04-062016-04-06
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
 Creator(s):
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 93 (15) Sequence Number: 155107 Start / End Page: 1 - 6 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008