Tunable THz surface plasmon polariton based on a topological insulator/layered superconductor hybrid structure
Name
PhysRevB.89.235432.pdf
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1.56 MB
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Author(s)
Li, Mingda
Dai, Zuyang
Cui, Wenping
Wang, Zhe
Katmis, Ferhat
Wang, Jiayue
Le, Peisi
Wu, Lijun
Zhu, Yimei
Date Issued
June 2014
Journal
Physical Review B
Publisher
American Physical Society
Citation
Li, Mingda, Zuyang Dai, Wenping Cui, Zhe Wang, Ferhat Katmis, Jiayue Wang, Peisi Le, Lijun Wu, and Yimei Zhu. “Tunable THz Surface Plasmon Polariton Based on a Topological Insulator/layered Superconductor Hybrid Structure.” Phys. Rev. B 89, no. 23 (June 2014). © 2014 American Physical Society
Version
Final published version
Abstract
We theoretically investigate the surface plasmon polariton (SPP) at the interface between a three-dimensional strong topological insulator (TI) and a layered superconductor/magnetic insulator structure, within the random phase approximation. The tunability of the SPP through electronic doping can be enhanced when the magnetic permeability of the layered structure becomes higher. When the interface is gapped by superconductivity or perpendicular magnetism, the SPP dispersion is further distorted, accompanied by a shift of group velocity and penetration depth. Such a shift of the SPP reaches a maximum when the magnitude of the Fermi level approaches the gap value, and may lead to observable effects. The tunable SPP at the interface between layered-superconductor and magnetic materials in proximity to the TI surface may provide new insight in the detection of Majorana fermions.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.89.235432
