Electronic analog of chiral metamaterial: Helicity-resolved filtering and focusing of Dirac fermions in thin films of topological materials
Name
PhysRevB.92.041408.pdf
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2.16 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Zhao, Lu
Wang, Jianfeng
Liu, Junwei
Xu, Yong
Gu, Bing-Lin
Xue, Qi-Kun
Duan, Wenhui
Date Issued
July 2015
Journal
Physical Review B
Publisher
American Physical Society
Citation
Zhao, Lu, Jianfeng Wang, Junwei Liu, Yong Xu, Bing-Lin Gu, Qi-Kun Xue, and Wenhui Duan. "Electronic analog of chiral metamaterial: Helicity-resolved filtering and focusing of Dirac fermions in thin films of topological materials." Phys. Rev. B 92, 041408 (July 2015). © 2015 American Physical Society
Version
Final published version
Abstract
Control over the helicity degree of freedom of Dirac fermions is identified in thin films of topological materials which act as a tunable “chiral-metamaterial-like” platform to tame left- and right-handed Dirac fermions in two dimensions. Using topological crystalline insulator SnTe(111) thin films as an example, we perform the first-principles calculations and show that giant helicity splitting in the band structures can be induced under moderate electric field. Based on this result, helicity-resolved functionalities, including pronounced electron dichroism, helicity switching, helical negative refraction, and birefraction, are demonstrated, where the intrahelical scattering always dominates over the interhelical one. Such intriguing control strategy for helical Dirac fermions may hold great promise for the applications of helicity-based electron optics and nanoelectronics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.92.041408
