Title
Monolayer behaviour in bulk <tex>$ReS_{2}$</tex> due to electronic and vibrational decoupling Monolayer behaviour in bulk <tex>$ReS_{2}$</tex> due to electronic and vibrational decoupling
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Engineering sciences. Technology
Source (journal)
Nature communications
Volume/pages
5(2014) , 6 p.
ISSN
2041-1723
2041-1723
Article Reference
3252
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Semiconducting transition metal dichalcogenides consist of monolayers held together by weak forces where the layers are electronically and vibrationally coupled. Isolated monolayers show changes in electronic structure and lattice vibration energies, including a transition from indirect to direct bandgap. Here we present a new member of the family, rhenium disulphide (ReS2), where such variation is absent and bulk behaves as electronically and vibrationally decoupled monolayers stacked together. From bulk to monolayers, ReS2 remains direct bandgap and its Raman spectrum shows no dependence on the number of layers. Interlayer decoupling is further demonstrated by the insensitivity of the optical absorption and Raman spectrum to interlayer distance modulated by hydrostatic pressure. Theoretical calculations attribute the decoupling to Peierls distortion of the 1T structure of ReS2, which prevents ordered stacking and minimizes the interlayer overlap of wavefunctions. Such vanishing interlayer coupling enables probing of two-dimensional-like systems without the need for monolayers.
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