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

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 severa...

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Autores principales:	A. Politano, D. Campi, M. Cattelan, I. Ben Amara, S. Jaziri, A. Mazzotti, A. Barinov, B. Gürbulak, S. Duman, S. Agnoli, L. S. Caputi, G. Granozzi, A. Cupolillo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e4305570cd19435fa4e0dfa97cc83932
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spelling	oai:doaj.org-article:e4305570cd19435fa4e0dfa97cc839322021-12-02T16:06:51ZIndium selenide: an insight into electronic band structure and surface excitations10.1038/s41598-017-03186-x2045-2322https://doaj.org/article/e4305570cd19435fa4e0dfa97cc839322017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03186-xhttps://doaj.org/toc/2045-2322Abstract 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.A. PolitanoD. CampiM. CattelanI. Ben AmaraS. JaziriA. MazzottiA. BarinovB. GürbulakS. DumanS. AgnoliL. S. CaputiG. GranozziA. CupolilloNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q A. Politano D. Campi M. Cattelan I. Ben Amara S. Jaziri A. Mazzotti A. Barinov B. Gürbulak S. Duman S. Agnoli L. S. Caputi G. Granozzi A. Cupolillo Indium selenide: an insight into electronic band structure and surface excitations
description	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.
format	article
author	A. Politano D. Campi M. Cattelan I. Ben Amara S. Jaziri A. Mazzotti A. Barinov B. Gürbulak S. Duman S. Agnoli L. S. Caputi G. Granozzi A. Cupolillo
author_facet	A. Politano D. Campi M. Cattelan I. Ben Amara S. Jaziri A. Mazzotti A. Barinov B. Gürbulak S. Duman S. Agnoli L. S. Caputi G. Granozzi A. Cupolillo
author_sort	A. Politano
title	Indium selenide: an insight into electronic band structure and surface excitations
title_short	Indium selenide: an insight into electronic band structure and surface excitations
title_full	Indium selenide: an insight into electronic band structure and surface excitations
title_fullStr	Indium selenide: an insight into electronic band structure and surface excitations
title_full_unstemmed	Indium selenide: an insight into electronic band structure and surface excitations
title_sort	indium selenide: an insight into electronic band structure and surface excitations
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e4305570cd19435fa4e0dfa97cc83932
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Indium selenide: an insight into electronic band structure and surface excitations

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