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  Floquet chiral hinge modes and their interplay with Weyl physics in a three-dimensional lattice

Huang, B., Novicenko, V., Eckardt, A., & Juzeliunas, G. (2021). Floquet chiral hinge modes and their interplay with Weyl physics in a three-dimensional lattice. Physical Review B, 104(10): 104312. doi:10.1103/PhysRevB.104.104312.

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2101.08281.pdf (Preprint), 13MB
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Huang, Biao1, Author           
Novicenko, Viktor2, Author
Eckardt, André1, Author           
Juzeliunas, Gediminas2, Author
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1Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              
2external, ou_persistent22              

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 MPIPKS: Ultracold matter
 Abstract: We demonstrate that a three-dimensional time-periodically driven (Floquet) lattice can exhibit chiral hinge states and describe their interplay with Weyl physics. A peculiar type of the hinge states is enforced by the repeated boundary reflections with lateral Goos-Hanchen-type shifts occurring at the second-order boundaries of our system. Such chiral hinge modes coexist in a wide range of parameter regimes with Fermi-arc surface states connecting a pair of Weyl points in a two-band model. We find numerically that these modes still preserve their locality along the hinge and their chiral nature in the presence of local defects and other parameter changes. We trace the robustness of such chiral hinge modes to special band structure unique in a Floquet system allowing all the eigenstates to be localized in quasi-one-dimensional regions parallel to each other when open hinge boundaries are introduced. The implementation of a model featuring both the second-order Floquet skin effect and the Weyl physics is straightforward with ultracold atoms in optical superlattices.

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 Dates: 2021-09-242021-09-01
 Publication Status: Issued
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 104 (10) Sequence Number: 104312 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008