FANO RESONANCE QUENCH IN A STRONGLY CORRELATED PLEXCITONIC SYSTEM VIA ELECTRON-PHONON COUPLING

Abstract

We investigated the optical absorption of a nanojunction comprised of two level quantum emitter coupled to metal nanoparticles possessing plasmon resonances and electron-phonon coupling by solving the Dyson equations invoking the non-crossing approximation.  We explored the evolution of the Fano resonance arising due to plasmon-exciton coupling for different ambient temperature, plasmon-exciton coupling and electron-phonon coupling values when both levels are in Coulomb blockade. Our findings indicate that boosting electron-phonon coupling cause a suppression of the Fano resonance for all ambient temperature values. Increasing the plasmon-exciton coupling value enables to reduce this suppression. Since the formation of the Fano resonance is related to the formation of the Kondo resonance, we attributed this situation to the gradual disappearance of the Kondo resonance arising from the electron-phonon coupling.

Keywords

• Fano resonance,Plasmon,Kondo effect,Excitons

GÜÇLÜ KORELASYONLU PLEGZİTONİK BİR SİSTEMDE FANO REZONANSININ ELEKTRON-FONON EŞLEŞMESİ YOLUYLA BASTIRILMASI

Abstract

Plazmon rezonanslarına sahip metal nanoparçacıklarla eşleşmiş güçlü elektron korelasyonlarına ve elektron-fonon eşleşmesine sahip iki düzeyli bir kuantum emitörden oluşan bir nano bağlantı noktasının optik emilme spektrumunu Dyson denklemlerini kesişmeme yaklaşımıyla çözerek inceledik. İki kesik düzey de Coulomb blokajındayken plazmon-egziton eşleşmesinden doğan Fano rezonanasının evrimini değişik ortam sıcaklığı, plazmon-egziton eşleşmesi ve elektron-fonon eşleşmesi değerleri için araştırdık. Bulgularımız elektron-fonon eşleşmesini artırmanın bütün ortam sıcaklıklarında Fano rezonansının bastırılmasına yol açtığını göstermektedir. Plazmon-egziton eşleşme değerini artırmak bu bastırılmayı azaltmaya olanak sağlamaktadır. Fano rezonansının oluşumu Kondo rezonansının oluşumu ile bağlantılı olduğundan, bu durumu elektron-fonon eşleşmesinden ötürü Kondo rezonansının giderek yok olmasına bağladık.

Keywords

• Fano rezonansı,Plazmon,Kondo etkisi,Egzitonlar

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