Chiral Floquet engineering on topological fermions in chiral crystals
Abstract The interplay of chiralities in light and quantum matter provides an opportunity to design and manipulate chirality-dependent properties in quantum materials. Herein we report the chirality-dependent Floquet engineering on topological fermions with the high Chern number in chiral crystal Co...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-12-01
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| Series: | npj Quantum Materials |
| Online Access: | https://doi.org/10.1038/s41535-024-00714-7 |
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| author | Benshu Fan Wenhui Duan Angel Rubio Peizhe Tang |
| author_facet | Benshu Fan Wenhui Duan Angel Rubio Peizhe Tang |
| author_sort | Benshu Fan |
| collection | DOAJ |
| description | Abstract The interplay of chiralities in light and quantum matter provides an opportunity to design and manipulate chirality-dependent properties in quantum materials. Herein we report the chirality-dependent Floquet engineering on topological fermions with the high Chern number in chiral crystal CoSi via circularly polarized light (CPL) pumping. Intense light pumping does not compromise the gapless nature of topological fermions in CoSi, but displaces the crossing points in momentum space along the direction of light propagation. The Floquet chirality index is proposed to signify the interplay between the chiralities of topological fermion, crystal, and incident light, which determines the amplitudes and directions of light-induced momentum shifts. Regarding the time-reversal symmetry breaking induced by the CPL pumping, momentum shifts of topological fermions result in the birth of transient anomalous Hall signals in non-magnetic CoSi within an ultrafast time scale, which Mid-infrared (IR) pumping and terahertz (THz) Kerr or Faraday probe spectroscopy could experimentally detect. Our findings provide insights into exploring novel applications in optoelectronic devices by leveraging the degree of freedom of chirality in the non-equilibrium regime. |
| format | Article |
| id | doaj-art-7d598f5a7a084fb88b4219c1e0a7c4ae |
| institution | Kabale University |
| issn | 2397-4648 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Quantum Materials |
| spelling | doaj-art-7d598f5a7a084fb88b4219c1e0a7c4ae2024-12-22T12:12:52ZengNature Portfolionpj Quantum Materials2397-46482024-12-01911710.1038/s41535-024-00714-7Chiral Floquet engineering on topological fermions in chiral crystalsBenshu Fan0Wenhui Duan1Angel Rubio2Peizhe Tang3State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua UniversityState Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua UniversityMax Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser ScienceMax Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser ScienceAbstract The interplay of chiralities in light and quantum matter provides an opportunity to design and manipulate chirality-dependent properties in quantum materials. Herein we report the chirality-dependent Floquet engineering on topological fermions with the high Chern number in chiral crystal CoSi via circularly polarized light (CPL) pumping. Intense light pumping does not compromise the gapless nature of topological fermions in CoSi, but displaces the crossing points in momentum space along the direction of light propagation. The Floquet chirality index is proposed to signify the interplay between the chiralities of topological fermion, crystal, and incident light, which determines the amplitudes and directions of light-induced momentum shifts. Regarding the time-reversal symmetry breaking induced by the CPL pumping, momentum shifts of topological fermions result in the birth of transient anomalous Hall signals in non-magnetic CoSi within an ultrafast time scale, which Mid-infrared (IR) pumping and terahertz (THz) Kerr or Faraday probe spectroscopy could experimentally detect. Our findings provide insights into exploring novel applications in optoelectronic devices by leveraging the degree of freedom of chirality in the non-equilibrium regime.https://doi.org/10.1038/s41535-024-00714-7 |
| spellingShingle | Benshu Fan Wenhui Duan Angel Rubio Peizhe Tang Chiral Floquet engineering on topological fermions in chiral crystals npj Quantum Materials |
| title | Chiral Floquet engineering on topological fermions in chiral crystals |
| title_full | Chiral Floquet engineering on topological fermions in chiral crystals |
| title_fullStr | Chiral Floquet engineering on topological fermions in chiral crystals |
| title_full_unstemmed | Chiral Floquet engineering on topological fermions in chiral crystals |
| title_short | Chiral Floquet engineering on topological fermions in chiral crystals |
| title_sort | chiral floquet engineering on topological fermions in chiral crystals |
| url | https://doi.org/10.1038/s41535-024-00714-7 |
| work_keys_str_mv | AT benshufan chiralfloquetengineeringontopologicalfermionsinchiralcrystals AT wenhuiduan chiralfloquetengineeringontopologicalfermionsinchiralcrystals AT angelrubio chiralfloquetengineeringontopologicalfermionsinchiralcrystals AT peizhetang chiralfloquetengineeringontopologicalfermionsinchiralcrystals |