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Pregled bibliografske jedinice broj: 1058092

Phonon-assisted processes in the ultraviolet-transient optical response of graphene


Novko, Dino; Kralj, Marko
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

Profili:

Avatar Url Dino Novko (autor)

Avatar Url Marko Kralj (autor)

Poveznice na cjeloviti tekst rada:

doi www.nature.com arxiv.org

Citiraj ovu publikaciju:

Novko, Dino; Kralj, Marko
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)
Novko, D. & Kralj, M. (2019) Phonon-assisted processes in the ultraviolet-transient optical response of graphene. npj 2D Materials and Applications, 3, 48, 9 doi:10.1038/s41699-019-0131-5.
@article{article, author = {Novko, Dino and Kralj, Marko}, year = {2019}, pages = {9}, DOI = {10.1038/s41699-019-0131-5}, chapter = {48}, keywords = {graphene, transient optical response, phonons}, journal = {npj 2D Materials and Applications}, doi = {10.1038/s41699-019-0131-5}, volume = {3}, issn = {2397-7132}, title = {Phonon-assisted processes in the ultraviolet-transient optical response of graphene}, keyword = {graphene, transient optical response, phonons}, chapternumber = {48} }
@article{article, author = {Novko, Dino and Kralj, Marko}, year = {2019}, pages = {9}, DOI = {10.1038/s41699-019-0131-5}, chapter = {48}, keywords = {graphene, transient optical response, phonons}, journal = {npj 2D Materials and Applications}, doi = {10.1038/s41699-019-0131-5}, volume = {3}, issn = {2397-7132}, title = {Phonon-assisted processes in the ultraviolet- transient optical response of graphene}, keyword = {graphene, transient optical response, phonons}, chapternumber = {48} }

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)


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