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

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6 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號045414
期刊Physical Review B
99
發行號4
DOIs
出版狀態Published - 2019 一月 9

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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