English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Giant topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi

Ni, Z., Wang, K., Zhang, Y., Pozo, O., Xu, B., Han, X., et al. (2021). Giant topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi. Nature Communications, 12: 154, pp. 1-8. doi:10.1038/s41467-020-20408-5.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0007-CE6C-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-CE74-F
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Ni, Zhuoliang1, Author
Wang, K.1, Author
Zhang, Y.2, Author              
Pozo, O.1, Author
Xu, B.1, Author
Han, X.1, Author
Manna, K.2, Author              
Paglione, J.1, Author
Felser, C.3, Author              
Grushin, A. G.1, Author
de Juan, F.1, Author
Mele, E. J.1, Author
Wu, L.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

Content

show
hide
Free keywords: crystal structure, DNA, electron, emission, literature review, topology, article, calculation, chirality, conductance, crystal, doping, infrared radiation, photon, spectroscopy
 Abstract: The absence of mirror symmetry, or chirality, is behind striking natural phenomena found in systems as diverse as DNA and crystalline solids. A remarkable example occurs when chiral semimetals with topologically protected band degeneracies are illuminated with circularly polarized light. Under the right conditions, the part of the generated photocurrent that switches sign upon reversal of the light’s polarization, known as the circular photo-galvanic effect, is predicted to depend only on fundamental constants. The conditions to observe quantization are non-universal, and depend on material parameters and the incident frequency. In this work, we perform terahertz emission spectroscopy with tunable photon energy from 0.2 –1.1 eV in the chiral topological semimetal CoSi. We identify a large longitudinal photocurrent peaked at 0.4 eV reaching ~550 μ A/V2, which is much larger than the photocurrent in any chiral crystal reported in the literature. Using first-principles calculations we establish that the peak originates only from topological band crossings, reaching 3.3 ± 0.3 in units of the quantization constant. Our calculations indicate that the quantized circular photo-galvanic effect is within reach in CoSi upon doping and increase of the hot-carrier lifetime. The large photo-conductivity suggests that topological semimetals could potentially be used as novel mid-infrared detectors. © 2021, The Author(s).

Details

show
hide
Language(s): eng - English
 Dates: 2021-01-082021-01-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1038/s41467-020-20408-5
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 12 Sequence Number: 154 Start / End Page: 1 - 8 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723