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

研究成果: Article

28 引文 斯高帕斯(Scopus)


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.

期刊Physical review letters
出版狀態Published - 2018 八月 22

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Politano, A., Chiarello, G., Ghosh, B., Sadhukhan, K., Kuo, C. N., Lue, C. S., Pellegrini, V., & 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