Plasmons in Z 2 topological insulators
Abstract
Here, we study plasmonic excitations in the Kane-Mele model, a two-dimensional Z2 topological insulator on the honeycomb lattice, using the random phase approximation (RPA). In the topologically nontrivial phase, the model has conducting edge states that traverse the bulk energy gap and display spin-momentum locking. Such a state of matter is called the quantum spin hall (QSH) phase, which is robust against time-reversal (TR) invariant perturbations. We find that in the QSH phase, gapless spin-polarized plasmons can be excited on the edges of the system. The propagation of these plasmons is chiral for each individual spin component and shows spin-momentum locking for both spin components on the same edge. Moreover, we study the effect of external magnetic fields on the gapless edge plasmons. Specifically, out-of-plane magnetic fields delocalize edge plasmons propagating in one direction without affecting the other one, while an in-plane magnetic field can be applied to selectively excite a specific spin-plasmon branch with proper doping or gating to the system. Our findings may have potential applications in novel plasmonic and spintronic devices. We also investigate plasmons in the Kane-Mele model on a finite-sized diamond-shaped nanoflake and observe low-energy plasmons circulating the boundary of the material.
- Authors:
-
[1];
[2];
[3]
- University of Southern California, Los Angeles, CA (United States)
- Ludwig-Maximilians-Universität München (Germany); Munich Center for Quantum Science and Technology (MCQST) (Germany)
- University of Illinois at Urbana-Champaign, IL (United States); University of Southern California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
- OSTI Identifier:
- 1975782
- Grant/Contract Number:
- SC0022060
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 107; Journal Issue: 15; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Kane-Mele model; Plasmons; Topological insulators; Random phase approximation
Citation Formats
Guan, Yuling, Haas, Stephan, Schlömer, Henning, and Jiang, Zhihao. Plasmons in Z2 topological insulators. United States: N. p., 2023.
Web. doi:10.1103/physrevb.107.155414.
Guan, Yuling, Haas, Stephan, Schlömer, Henning, & Jiang, Zhihao. Plasmons in Z2 topological insulators. United States. https://doi.org/10.1103/physrevb.107.155414
Guan, Yuling, Haas, Stephan, Schlömer, Henning, and Jiang, Zhihao. Tue .
"Plasmons in Z2 topological insulators". United States. https://doi.org/10.1103/physrevb.107.155414. https://www.osti.gov/servlets/purl/1975782.
@article{osti_1975782,
title = {Plasmons in Z2 topological insulators},
author = {Guan, Yuling and Haas, Stephan and Schlömer, Henning and Jiang, Zhihao},
abstractNote = {Here, we study plasmonic excitations in the Kane-Mele model, a two-dimensional Z2 topological insulator on the honeycomb lattice, using the random phase approximation (RPA). In the topologically nontrivial phase, the model has conducting edge states that traverse the bulk energy gap and display spin-momentum locking. Such a state of matter is called the quantum spin hall (QSH) phase, which is robust against time-reversal (TR) invariant perturbations. We find that in the QSH phase, gapless spin-polarized plasmons can be excited on the edges of the system. The propagation of these plasmons is chiral for each individual spin component and shows spin-momentum locking for both spin components on the same edge. Moreover, we study the effect of external magnetic fields on the gapless edge plasmons. Specifically, out-of-plane magnetic fields delocalize edge plasmons propagating in one direction without affecting the other one, while an in-plane magnetic field can be applied to selectively excite a specific spin-plasmon branch with proper doping or gating to the system. Our findings may have potential applications in novel plasmonic and spintronic devices. We also investigate plasmons in the Kane-Mele model on a finite-sized diamond-shaped nanoflake and observe low-energy plasmons circulating the boundary of the material.},
doi = {10.1103/physrevb.107.155414},
journal = {Physical Review. B},
number = 15,
volume = 107,
place = {United States},
year = {Tue Apr 11 00:00:00 EDT 2023},
month = {Tue Apr 11 00:00:00 EDT 2023}
}
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