Lattice dynamics of the rhenium and technetium dichalcogenides


Wolverson, D., Hart, L., 2016. Lattice dynamics of the rhenium and technetium dichalcogenides. University of Bath. https://doi.org/10.15125/BATH-00130.


Dataset abstract

The rhenium and technetium dichalcogenides are layered van der Waals semiconductors which show a large number of Raman-active zone centre phonon modes as a result of their unusually large unit cells and deviation from hexagonal symmetry. They thus offer the possibility of introducing in-plane anisotropy into composite heterostructures based on van der Waals materials, and Raman spectroscopy is generally used to determine their in-plane orientation. We show that first principles calculations give a good description of the lattice dynamics of this family of materials and thus predict the zone-center phonon frequencies and Raman activities of TcS2. We consider the distribution of the phonon modes in frequency and their atomic displacements, and give a unified understanding of the phonon frequencies and Raman spectra of ReS2, TcS2 and ReSe2 in terms of the scaling of Raman frequency with the chalcogen mass.

Title: Lattice dynamics of the rhenium and technetium dichalcogenides
Keywords: Nanoscale materials
Departments: Faculty of Science > Physics
DOI: https://doi.org/10.15125/BATH-00130
URI: https://researchdata.bath.ac.uk/id/eprint/130
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