Plasmons in Z2 topological insulators

Guan, Yuling; Haas, Stephan; Schlömer, Henning; Jiang, Zhihao

doi:10.1103/physrevb.107.155414

Title: Plasmons in Z 2 topological insulators

Journal Article · Tue Apr 11 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.155414· OSTI ID:1975782

^[1]; Haas, Stephan ^[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)

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.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0022060

OSTI ID:: 1975782

Journal Information:: Physical Review. B, Vol. 107, Issue 15; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Kane-Mele model
Plasmons
Topological insulators
Random phase approximation

Title: Plasmons in Z 2 topological insulators

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