Pregled bibliografske jedinice broj: 1058092
Phonon-assisted processes in the ultraviolet-transient optical response of graphene
Phonon-assisted processes in the ultraviolet-transient optical response of graphene // npj 2D Materials and Applications, 3 (2019), 48, 9 doi:10.1038/s41699-019-0131-5 (međunarodna recenzija, članak, znanstveni)
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Naslov
Phonon-assisted processes in the ultraviolet-transient optical response of graphene
(Phonon-assisted processes in the ultraviolet-
transient optical response of graphene)
Autori
Novko, Dino ; Kralj, Marko
Izvornik
Npj 2D Materials and Applications (2397-7132) 3
(2019);
48, 9
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
graphene ; transient optical response ; phonons
Sažetak
Many recent experiments investigated potential and attractive means of modifying many-body interactions in two-dimensional materials through time-resolved spectroscopy techniques. However, the role of ultrafast phonon-assisted processes in two-dimensional systems is rarely discussed in depth. Here, we investigate the role of electron–phonon interaction in the transient optical absorption of graphene by means of first-principles methods. It is shown at equilibrium that the phonon-assisted transitions renormalize significantly the electronic structure. As a result, absorption peak around the Van-Hove singularity broadens and redshifts by ~100 meV. In addition, temperature increase and chemical doping are shown to notably enhance these phonon-assisted features. In the photoinduced transient response, we obtain spectral changes in close agreement with the experiments, and we associate them to the strong renormalization of occupied and unoccupied π bands, which predominantly comes from the coupling with the zone-center E2g optical phonon. Our estimation of the Coulomb interaction effects shows that the phonon- assisted processes can have a dominant role even in the subpicosecond regime.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
POVEZANOST RADA
Projekti:
IP-2016-06-3211 - Optička svojstva heterostruktura dihalkogenida prijelaznih metala (OhTMD) (Kralj, Marko, HRZZ - 2016-06) ( CroRIS)
Ustanove:
Institut za fiziku, Zagreb
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Emerging Sources Citation Index (ESCI)