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

Year 2017, Issue: 038, 7 - 22, 30.06.2017

Ali İhsan Göker Arslan Ünal

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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