Volume 259, Issue 1 2100321
Research Article
Free to Read

Phonons in WSe2/MoSe2 van der Waals Heterobilayers

Fayssal Mahrouche

Corresponding Author

Fayssal Mahrouche

Laboratoire de Physique Théorique, Faculté des Sciences Exactes, Université de Bejaia, 06000 Bejaia, Algérie

Departamento de Física Aplicada, Universidad de Alicante, 03690 San Vicente del Raspeig, Spain

Search for more papers by this author
Karim Rezouali

Karim Rezouali

Laboratoire de Physique Théorique, Faculté des Sciences Exactes, Université de Bejaia, 06000 Bejaia, Algérie

Search for more papers by this author
Sofiane Mahtout

Sofiane Mahtout

Laboratoire de Physique Théorique, Faculté des Sciences Exactes, Université de Bejaia, 06000 Bejaia, Algérie

Search for more papers by this author
Foudil Zaabar

Foudil Zaabar

Laboratoire de Physique Théorique, Faculté des Sciences Exactes, Université de Bejaia, 06000 Bejaia, Algérie

Search for more papers by this author
Alejandro Molina-Sánchez

Alejandro Molina-Sánchez

Institute of Materials Science (ICMUV), University of Valencia, Catedrático Beltrán 2, E-46980 Valencia, Spain

Search for more papers by this author
First published: 05 November 2021
Citations: 7

Abstract

The first-principles calculations of the structural and vibrational properties of the synthesized 2D van der Waals (vdW) heterobilayers (HBLs) formed by single-layer dichalcogenides MoSe2 and WSe2 are reported. When combining these systems in periodic 2D heterostructures, the intrinsic phonon characteristics of the free-standing constituents are to a large extent preserved but, furthermore, exhibit shear and breathing phonon modes that are not present in the individual building blocks. These unusual modes, which are extremely sensitive to weak vdW forces, could be a useful tool for the characterization of the optical properties of vdW heterostructures. In addition to these features, the departure of flexural modes of the HBL from the ones of its monolayer parents is also found.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.