Vibrational and dielectric properties of the bulk transition metal dichalcogenides

Nicholas A. Pike, Antoine Dewandre, Benoit Van Troeye, Xavier Gonze, Matthieu J. Verstraete

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Interest in the bulk transition metal dichalcogenides for their electronic, photovoltaic, and optical properties has grown and led to their use in many technological applications. We present a systematic investigation of their interlinked vibrational and dielectric properties using density functional theory and density functional perturbation theory, studying the effects of the spin-orbit interaction and of the long-range e - e- correlation as part of our investigation. This study confirms that the spin-orbit interaction plays a small role in these physical properties, while the direct contribution of dispersion corrections is of crucial importance in the description of the interatomic force constants. Here, our analysis of the structural and vibrational properties, including the Raman spectra, compare well to experimental measurement. Three materials with different point groups are showcased, and data trends on the full set of 15 existing hexagonal, trigonal, and triclinic materials are demonstrated. This overall picture will enable the modeling of devices composed of these materials for novel applications.

Original languageEnglish
Article number063608
JournalPhysical Review Materials
Volume2
Issue number6
DOIs
Publication statusPublished - 28 Jun 2018
Externally publishedYes

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