Journal article · Preprint article
Visualizing hybridized quantum plasmons in coupled nanowires: From classical to tunneling regime
Department of Physics, Technical University of Denmark1
Computational Atomic-scale Materials Design, Department of Physics, Technical University of Denmark2
Technical University of Denmark3
Department of Photonics Engineering, Technical University of Denmark4
Structured Electromagnetic Materials, Department of Photonics Engineering, Technical University of Denmark5
Center for Nanostructured Graphene, Centers, Technical University of Denmark6
We present full quantum-mechanical calculations of the hybridized plasmon modes of two nanowires at small separation, providing real-space visualization of the modes in the transition from the classical to the quantum tunneling regime. The plasmon modes are obtained as certain eigenfunctions of the dynamical dielectric function, which is computed using time-dependent density functional theory (TDDFT).
For freestanding wires, the energy of both surface and bulk plasmon modes deviate from the classical result for low wire radii and high momentum transfer due to effects of electron spill-out, nonlocal response, and coupling to single-particle transitions. For the wire dimer, the shape of the hybridized plasmon modes are continuously altered with decreasing separation, and below 6 A˚, the energy dispersion of the modes deviate from classical results due to the onset of weak tunneling.
Below 2-3 A˚ separation, this mode is replaced by a charge-transfer plasmon, which blue shifts with decreasing separation in agreement with experiment and marks the onset of the strong tunneling regime.
Language: | English |
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Publisher: | American Physical Society (APS) |
Year: | 2013 |
ISSN: | 1550235x and 10980121 |
Types: | Journal article and Preprint article |
DOI: | 10.1103/PhysRevB.87.235433 |
ORCIDs: | Mortensen, N. Asger and Thygesen, Kristian Sommer |