We have investigated the electronic response of single crystals of indium selenide by means of angle-resolved photoemission spectroscopy, electron energy loss spectroscopy and density functional theory. The loss spectrum of indium selenide shows the direct free exciton at ~1.3 eV and several other peaks, which do not exhibit dispersion with the momentum. The joint analysis of the experimental band structure and the density of states indicates that spectral features in the loss function are strictly related to single-particle transitions. These excitations cannot be considered as fully coherent plasmons and they are damped even in the optical limit, i.e. for small momenta. The comparison of the calculated symmetry-projected density of states with electron energy loss spectra enables the assignment of the spectral features to transitions between specific electronic states. Furthermore, the effects of ambient gases on the band structure and on the loss function have been probed.

Politano, A., Campi, D., Cattelan, M., Ben Amara, I., Jaziri, S., Mazzotti, A., et al. (2017). Indium selenide: An insight into electronic band structure and surface excitations. SCIENTIFIC REPORTS, 7(1) [10.1038/s41598-017-03186-x].

Indium selenide: An insight into electronic band structure and surface excitations

Campi D.;
2017

Abstract

We have investigated the electronic response of single crystals of indium selenide by means of angle-resolved photoemission spectroscopy, electron energy loss spectroscopy and density functional theory. The loss spectrum of indium selenide shows the direct free exciton at ~1.3 eV and several other peaks, which do not exhibit dispersion with the momentum. The joint analysis of the experimental band structure and the density of states indicates that spectral features in the loss function are strictly related to single-particle transitions. These excitations cannot be considered as fully coherent plasmons and they are damped even in the optical limit, i.e. for small momenta. The comparison of the calculated symmetry-projected density of states with electron energy loss spectra enables the assignment of the spectral features to transitions between specific electronic states. Furthermore, the effects of ambient gases on the band structure and on the loss function have been probed.
Articolo in rivista - Articolo scientifico
2d materials, electronic band structure
English
2017
7
1
3445
none
Politano, A., Campi, D., Cattelan, M., Ben Amara, I., Jaziri, S., Mazzotti, A., et al. (2017). Indium selenide: An insight into electronic band structure and surface excitations. SCIENTIFIC REPORTS, 7(1) [10.1038/s41598-017-03186-x].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/409797
Citazioni
  • Scopus 54
  • ???jsp.display-item.citation.isi??? 51
Social impact