3D Dirac Plasmons in the Type-II Dirac Semimetal PtTe2

Antonio Politano, Gennaro Chiarello, Barun Ghosh, Krishanu Sadhukhan, Chia Nung Kuo, Chin Shan Lue, Vittorio Pellegrini, Amit Agarwal

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Transition-metal dichalcogenides showing type-II Dirac fermions are emerging as innovative materials for nanoelectronics. However, their excitation spectrum is mostly unexplored yet. By means of high-resolution electron energy loss spectroscopy and density functional theory, here, we identify the collective excitations of type-II Dirac fermions (3D Dirac plasmons) in PtTe2 single crystals. The observed plasmon energy in the long-wavelength limit is ∼0.5 eV, which makes PtTe2 suitable for near-infrared optoelectronic applications. We also demonstrate that interband transitions between the two Dirac bands in PtTe2 give rise to additional excitations at ∼1 and ∼1.4 eV. Our results are crucial to bringing to fruition type-II Dirac semimetals in optoelectronics.

Original languageEnglish
Article number086804
JournalPhysical review letters
Volume121
Issue number8
DOIs
Publication statusPublished - 2018 Aug 22

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metalloids
plasmons
fermions
excitation
emerging
energy dissipation
transition metals
electron energy
density functional theory
high resolution
single crystals
wavelengths
spectroscopy
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Politano, A., Chiarello, G., Ghosh, B., Sadhukhan, K., Kuo, C. N., Lue, C. S., ... Agarwal, A. (2018). 3D Dirac Plasmons in the Type-II Dirac Semimetal PtTe2. Physical review letters, 121(8), [086804]. https://doi.org/10.1103/PhysRevLett.121.086804
Politano, Antonio ; Chiarello, Gennaro ; Ghosh, Barun ; Sadhukhan, Krishanu ; Kuo, Chia Nung ; Lue, Chin Shan ; Pellegrini, Vittorio ; Agarwal, Amit. / 3D Dirac Plasmons in the Type-II Dirac Semimetal PtTe2. In: Physical review letters. 2018 ; Vol. 121, No. 8.
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Politano, A, Chiarello, G, Ghosh, B, Sadhukhan, K, Kuo, CN, Lue, CS, Pellegrini, V & Agarwal, A 2018, '3D Dirac Plasmons in the Type-II Dirac Semimetal PtTe2', Physical review letters, vol. 121, no. 8, 086804. https://doi.org/10.1103/PhysRevLett.121.086804

3D Dirac Plasmons in the Type-II Dirac Semimetal PtTe2. / Politano, Antonio; Chiarello, Gennaro; Ghosh, Barun; Sadhukhan, Krishanu; Kuo, Chia Nung; Lue, Chin Shan; Pellegrini, Vittorio; Agarwal, Amit.

In: Physical review letters, Vol. 121, No. 8, 086804, 22.08.2018.

Research output: Contribution to journalArticle

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