Broadband excitation spectrum of bulk crystals and thin layers of PtTe2

Barun Ghosh, Francesca Alessandro, Marilena Zappia, Rosaria Brescia, Chia Nung Kuo, Chin-Shan Lue, Gennaro Chiarello, Antonio Politano, Lorenzo S. Caputi, Amit Agarwal, Anna Cupolillo

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We explore the broadband excitation spectrum of bulk PtTe2 using electron energy-loss spectroscopy and density-functional theory. In addition to infrared modes related to intraband three-dimensional (3D) Dirac plasmon and interband transitions between the 3D Dirac bands, we observe modes at 3.9, 7.5, and 19.0 eV in the ultraviolet region. The comparison of the excitation spectrum with the calculated orbital-resolved density of states allows us to ascribe spectral features to transitions between specific electronic states. Additionally, we study the thickness dependence of the high-energy-loss peak in the PtTe2 thin films. We show that, unlike graphene, the high-energy EELS peak in PtTe2 thin film gets redshifted by ∼2.5 eV with increasing thickness.

Original languageEnglish
Article number045414
JournalPhysical Review B
Volume99
Issue number4
DOIs
Publication statusPublished - 2019 Jan 9

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Electron energy loss spectroscopy
energy dissipation
broadband
Thin films
Crystals
Graphite
Electronic states
thin films
Graphene
excitation
crystals
Density functional theory
Energy dissipation
graphene
electron energy
density functional theory
Infrared radiation
orbitals
electronics
spectroscopy

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ghosh, B., Alessandro, F., Zappia, M., Brescia, R., Kuo, C. N., Lue, C-S., ... Cupolillo, A. (2019). Broadband excitation spectrum of bulk crystals and thin layers of PtTe2. Physical Review B, 99(4), [045414]. https://doi.org/10.1103/PhysRevB.99.045414
Ghosh, Barun ; Alessandro, Francesca ; Zappia, Marilena ; Brescia, Rosaria ; Kuo, Chia Nung ; Lue, Chin-Shan ; Chiarello, Gennaro ; Politano, Antonio ; Caputi, Lorenzo S. ; Agarwal, Amit ; Cupolillo, Anna. / Broadband excitation spectrum of bulk crystals and thin layers of PtTe2. In: Physical Review B. 2019 ; Vol. 99, No. 4.
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Ghosh, B, Alessandro, F, Zappia, M, Brescia, R, Kuo, CN, Lue, C-S, Chiarello, G, Politano, A, Caputi, LS, Agarwal, A & Cupolillo, A 2019, 'Broadband excitation spectrum of bulk crystals and thin layers of PtTe2', Physical Review B, vol. 99, no. 4, 045414. https://doi.org/10.1103/PhysRevB.99.045414

Broadband excitation spectrum of bulk crystals and thin layers of PtTe2. / Ghosh, Barun; Alessandro, Francesca; Zappia, Marilena; Brescia, Rosaria; Kuo, Chia Nung; Lue, Chin-Shan; Chiarello, Gennaro; Politano, Antonio; Caputi, Lorenzo S.; Agarwal, Amit; Cupolillo, Anna.

In: Physical Review B, Vol. 99, No. 4, 045414, 09.01.2019.

Research output: Contribution to journalArticle

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AU - Ghosh, Barun

AU - Alessandro, Francesca

AU - Zappia, Marilena

AU - Brescia, Rosaria

AU - Kuo, Chia Nung

AU - Lue, Chin-Shan

AU - Chiarello, Gennaro

AU - Politano, Antonio

AU - Caputi, Lorenzo S.

AU - Agarwal, Amit

AU - Cupolillo, Anna

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