2017
DOI: 10.1021/acsphotonics.7b00524
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Plasmonics in Topological Insulators: Spin–Charge Separation, the Influence of the Inversion Layer, and Phonon–Plasmon Coupling

Abstract: We demonstrate via three examples that topological insulators (TI) offer a new platform for plasmonics. First, we show that the collective excitations of a thin slab of a TI display spin-charge separation. This gives rise to purely charge-like optical and purely spin-like acoustic plasmons, respectively. Second, we argue that the depletion layer mixes Dirac and Schrödinger electrons which can lead to novel features such as high modulation depths and interband plasmons. The analysis is based on an extension of … Show more

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Cited by 51 publications
(45 citation statements)
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References 71 publications
(252 reference statements)
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“…In plots of both plasmon frequency as a function of wavevector (Figure 3a) and as a function of film thickness (Figure 3b www.advopticalmat.de plasmons and confirming the theory described in refs. [30,32]. In Figure 3a, the 1 µm samples seem to trend away from the theoretical curves.…”
Section: Wwwadvopticalmatdementioning
confidence: 88%
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“…In plots of both plasmon frequency as a function of wavevector (Figure 3a) and as a function of film thickness (Figure 3b www.advopticalmat.de plasmons and confirming the theory described in refs. [30,32]. In Figure 3a, the 1 µm samples seem to trend away from the theoretical curves.…”
Section: Wwwadvopticalmatdementioning
confidence: 88%
“…For constant stripe width and varying thicknesses, we see an increase in plasmon frequency with increasing thickness (consistent with a coupled 2D plasmon). [32] There is also a trend toward larger linewidths and shorter lifetimes at smaller stripe widths. The plasmon lifetime is calculated as τ pl = 1/γ pl .…”
Section: Wwwadvopticalmatdementioning
confidence: 94%
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