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 journalArticlepeer-review

33 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

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of '3D Dirac Plasmons in the Type-II Dirac Semimetal PtTe2'. Together they form a unique fingerprint.

Cite this