Giant topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi
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-infraredmore »
- Authors:
-
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy
- Univ. of Maryland, College Park, MD (United States). Dept. of Physics. Maryland Quantum Materials Center
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics; Max-Planck-Institut fur Chemische Physik fester Stoffe, Dresden (Germany)
- Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Instituto de Ciencia de Materiales de Madrid
- Univ. of Fribourg (Switzerland). Dept. of Physics. Fribourg Center for Nanomaterials
- Max-Planck-Institut fur Chemische Physik fester Stoffe, Dresden (Germany); Indian Inst. of Technology (IIT), New Delhi (India). Dept. of Physics
- Univ. of Maryland, College Park, MD (United States). Dept. of Physics. Maryland Quantum Materials Center; Canadian Inst. for Advanced Research, Toronto, ON (Canada)
- Max-Planck-Institut fur Chemische Physik fester Stoffe, Dresden (Germany); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
- Univ. of Grenoble Alpes, Saint-Martin-d-Heres (France). Centre National de la Recherche Scientifique (CNRS). Institut Neel
- Donostia International Physics Center, Sebastian (Spain)
- Publication Date:
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO); National Science Foundation (NSF); Gordon and Betty Moore Foundation (GBMF); Spanish MCI/AEI; MECD; Schwizerische Nationalfonds (SNF); ANR; European Research Council (ERC); German Research Foundation (DFG)
- OSTI Identifier:
- 1816570
- Grant/Contract Number:
- FG02-84ER45118; SC0018945; W911NF1910342; W911NF2020166; DMR-1720530; GBMF9071; PGC2018-101988-B-C21; FPU16/05460; PGC2018-099199-BI00; 200020-172611; ANR-18-CE30-0001-01; 829044; 742068; SFB 1143
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; infrared spectroscopy; mid-infrared photonics; nonlinear optics; topological insulators
Citation Formats
Ni, Zhuoliang, Wang, K., Zhang, Y., Pozo, O., Xu, B., Han, X., Manna, K., Paglione, J., Felser, C., Grushin, A. G., de Juan, F., Mele, E. J., and Wu, Liang. Giant topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi. United States: N. p., 2021.
Web. doi:10.1038/s41467-020-20408-5.
Ni, Zhuoliang, Wang, K., Zhang, Y., Pozo, O., Xu, B., Han, X., Manna, K., Paglione, J., Felser, C., Grushin, A. G., de Juan, F., Mele, E. J., & Wu, Liang. Giant topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi. United States. https://doi.org/10.1038/s41467-020-20408-5
Ni, Zhuoliang, Wang, K., Zhang, Y., Pozo, O., Xu, B., Han, X., Manna, K., Paglione, J., Felser, C., Grushin, A. G., de Juan, F., Mele, E. J., and Wu, Liang. Fri .
"Giant topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi". United States. https://doi.org/10.1038/s41467-020-20408-5. https://www.osti.gov/servlets/purl/1816570.
@article{osti_1816570,
title = {Giant topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi},
author = {Ni, Zhuoliang and Wang, K. and Zhang, Y. and Pozo, O. and Xu, B. and Han, X. and Manna, K. and Paglione, J. and Felser, C. and Grushin, A. G. and de Juan, F. and Mele, E. J. and Wu, Liang},
abstractNote = {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.},
doi = {10.1038/s41467-020-20408-5},
journal = {Nature Communications},
number = 1,
volume = 12,
place = {United States},
year = {Fri Jan 08 00:00:00 EST 2021},
month = {Fri Jan 08 00:00:00 EST 2021}
}
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