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Title: Optical signatures of multifold fermions in the chiral topological semimetal CoSi

Abstract

We present a comprehensive combined experimental and theoretical study of optical conductivity in the chiral topological semimetal CoSi based on the development of high-quality crystals. We reveal the presence and the energy range of various exotic multifold quasiparticles in the optical responses and provide experimental evidence for the realization of fourfold spin-3/2 fermions, which were not directly observed previously. Our work is critical to interpreting future optical and transport responses of multifold fermion materials. We believe the methods used in this work will not only stimulate future research in this class of materials but will also provide a strategy for addressing optical signatures of chiral topological fermions in solids.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5];  [2]; ORCiD logo [6];  [7];  [8]; ORCiD logo [1]; ORCiD logo [9];  [5]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [5]
  1. Fribourg Center for Nanomaterials, Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland,
  2. Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323,
  3. Institut Néel, CNRS and Université Grenoble Alpes, 38042 Grenoble, France,
  4. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104,, Department of Physics, Drexel University, Philadelphia, PA 19104,, Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104,
  5. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104,
  6. Max Planck Institut fur Chemische Physik fester Stoffe, 01187 Dresden, Germany,
  7. Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, MD 20742,
  8. Maryland Quantum Materials Center, Department of Physics, University of Maryland, College Park, MD 20742,, Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada
  9. Max Planck Institut fur Chemische Physik fester Stoffe, 01187 Dresden, Germany,, Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada
Publication Date:
Research Org.:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1678771
Alternate Identifier(s):
OSTI ID: 1849795; OSTI ID: 1867826
Grant/Contract Number:  
FG02-07ER46431
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 117 Journal Issue: 44; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; science & technology; topological semimetal; optical conductivity; multifold fermions; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; chiral topology, fermions, semimetal

Citation Formats

Xu, Bing, Fang, Zhenyao, Sánchez-Martínez, Miguel-Ángel, Venderbos, Jorn W. F., Ni, Zhuoliang, Qiu, Tian, Manna, Kaustuv, Wang, Kefeng, Paglione, Johnpierre, Bernhard, Christian, Felser, Claudia, Mele, Eugene J., Grushin, Adolfo G., Rappe, Andrew M., and Wu, Liang. Optical signatures of multifold fermions in the chiral topological semimetal CoSi. United States: N. p., 2020. Web. doi:10.1073/pnas.2010752117.
Xu, Bing, Fang, Zhenyao, Sánchez-Martínez, Miguel-Ángel, Venderbos, Jorn W. F., Ni, Zhuoliang, Qiu, Tian, Manna, Kaustuv, Wang, Kefeng, Paglione, Johnpierre, Bernhard, Christian, Felser, Claudia, Mele, Eugene J., Grushin, Adolfo G., Rappe, Andrew M., & Wu, Liang. Optical signatures of multifold fermions in the chiral topological semimetal CoSi. United States. https://doi.org/10.1073/pnas.2010752117
Xu, Bing, Fang, Zhenyao, Sánchez-Martínez, Miguel-Ángel, Venderbos, Jorn W. F., Ni, Zhuoliang, Qiu, Tian, Manna, Kaustuv, Wang, Kefeng, Paglione, Johnpierre, Bernhard, Christian, Felser, Claudia, Mele, Eugene J., Grushin, Adolfo G., Rappe, Andrew M., and Wu, Liang. Mon . "Optical signatures of multifold fermions in the chiral topological semimetal CoSi". United States. https://doi.org/10.1073/pnas.2010752117.
@article{osti_1678771,
title = {Optical signatures of multifold fermions in the chiral topological semimetal CoSi},
author = {Xu, Bing and Fang, Zhenyao and Sánchez-Martínez, Miguel-Ángel and Venderbos, Jorn W. F. and Ni, Zhuoliang and Qiu, Tian and Manna, Kaustuv and Wang, Kefeng and Paglione, Johnpierre and Bernhard, Christian and Felser, Claudia and Mele, Eugene J. and Grushin, Adolfo G. and Rappe, Andrew M. and Wu, Liang},
abstractNote = {We present a comprehensive combined experimental and theoretical study of optical conductivity in the chiral topological semimetal CoSi based on the development of high-quality crystals. We reveal the presence and the energy range of various exotic multifold quasiparticles in the optical responses and provide experimental evidence for the realization of fourfold spin-3/2 fermions, which were not directly observed previously. Our work is critical to interpreting future optical and transport responses of multifold fermion materials. We believe the methods used in this work will not only stimulate future research in this class of materials but will also provide a strategy for addressing optical signatures of chiral topological fermions in solids.},
doi = {10.1073/pnas.2010752117},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 44,
volume = 117,
place = {United States},
year = {Mon Oct 19 00:00:00 EDT 2020},
month = {Mon Oct 19 00:00:00 EDT 2020}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1073/pnas.2010752117

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