Using surface plasmonics to turn on fullerene's dark excitons

Znanstveni rad - Izvorni znanstveni rad

• Autor: Vito Despoja
• Autor: D. J. Mowbray
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

Using our recently proposed Bethe-Salpeter G_0W_0 formulation, we explore the optical absorption spectra of fullerene (C_60) near coinage metal surfaces (Cu, Ag, and Au). We pay special attention to how the surface plasmon ω_S influences the optical activity of fullerene. We find that the lower-energy fullerene excitons at 3.77 and 4.8 eV only weakly interact with the surface plasmon. However, we find that the surface plasmon strongly interacts with the most intense fullerene π exciton, i.e., the dipolar mode at ℏω+≈6.5 eV, and the quadrupolar mode at ℏω−≈6.8 eV. When fullerene is close to a copper surface (z_0≈5.3 Å), the dipolar mode ω_+ and “localized” surface plasmons in the molecule/surface interface hybridize to form two coupled modes which both absorb light. As a result, the molecule gains an additional optically active mode. Moreover, in resonance, when ω_S≈ω_±, the strong interaction with the surface plasmon destroys the ω− quadrupolar character and it becomes an optically active mode. In this case, the molecule gains two additional very intense optically active modes. Further, we find that this resonance condition, ω_S≈ω_±, is satisfied by silver and gold metal surfaces.

• Ključne riječi (engleski): fullerene; optical absorption; GW-BSE; surface plasmons
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical review B: Condensed matter and materials physics
• Brojčani podaci: vol. 89, br. 19, 195433
• p-ISSN: 1098-0121
• e-ISSN: 1550-235X
• DOI: https://doi.org/10.1103/PhysRevB.89.195433
• URN:NBN: urn:nbn:hr:217:807103
• Datum objave publikacije: 2014
• URL dokumenta: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.195433
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Copyright (2014) by the American Physical Society. Received 17 February 2014; revised manuscript received 9 April 2014; published 21 May 2014.
• Datum i vrijeme pohrane: 2019-11-30 21:05:58