Electronic bandstructure and van der Waals coupling of ReSe2 revealed by high-resolution angle-resolved photoemission spectroscopy

Abstract

ReSe2 and ReS2 are unusual compounds amongst the layered transition metal dichalcogenides as a result of their low symmetry, with a characteristic in-plane anisotropy due to in-plane rhenium chains. They preserve inversion symmetry independent of the number of layers and, in contrast to more well-known transition metal dichalcogenides, bulk and few-monolayer Re-TMD compounds have been proposed to behave as electronically and vibrational decoupled layers. Here, we probe for the first time the electronic band structure of bulk ReSe2 by direct nanoscale angle-resolved photoemission spectroscopy. We find a highly anisotropic in- and out-of-plane electronic structure, with the valence band maxima located away from any particular high-symmetry direction. The effective mass doubles its value perpendicular to the Re chains and the interlayer van der Waals coupling generates significant electronic dispersion normal to the layers. Our density functional theory calculations, including spin-orbit effects, are in excellent agreement with these experimental findings.

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Cited by in corpus (12)

• Electronic bandstructure of ReS2 by high resolution angle resolved photoemission spectroscopy
• Pressure dependence of direct optical transitions in ReS2 and ReSe2
• Visualizing Orbital Content of Electronic Bands in Anisotropic 2D Semiconducting ReSe${}_2$
• Vibrational and dielectric properties of the bulk transition metal dichalcogenides
• Anisotropic effects in two-dimensional materials
• The optical signature of few-layer ReSe${}_2$
• Phase Modulators Based on High Mobility Ambipolar ReSe2 Field-Effect Transistors
• Electronic band structure of rhenium dichalcogenides
• Vibrational and dielectric properties of monolayer transition metal dichalcogenides
• Interplay of crystal thickness and in-plane anisotropy and evolution of quasi-one dimensional electronic character in ReSe${}_2$
• Using in-plane anisotropy to engineer Janus monolayers of rhenium dichalcogenides
• Topological bands in metals