Coherent Phononics of van der Waals Layers on Nanogratings

Yan, Wenjing; Akimov, Andrey V.; Barra-Burillo, María; Bayer, Manfred; Bradford, Jonathan; Gusev, Vitalyi E.; Hueso, Luis E.; Kent, Anthony; Kukhtaruk, Serhii; Nadzeyka, Achim; Patanè, Amalia; Rushforth, Andrew W.; Scherbakov, Alexey V.; Yaremkevich, Dmytro D.; Linnik, Tetiana L.

Abstract

Strain engineering can be used to control the physical properties of two-dimensional van der Waals (2D-vdW) crystals. Coherent phonons, which carry dynamical strain, could push strain engineering to control classical and quantum phenomena in the unexplored picosecond temporal and nanometer spatial regimes. This intriguing approach requires the use of coherent GHz and sub-THz 2D phonons. Here, we report on nanostructures that combine nanometer thick vdW layers and nanogratings. Using an ultrafast pump-probe technique, we generate and detect in-plane coherent phonons with frequency up to 40 GHz and hybrid flexural phonons with frequency up to 10 GHz. The latter arises from the periodic modulation of the elastic coupling of the vdW layer at the grooves and ridges of the nanograting. This creates a new type of a tailorable 2D periodic phononic nanoobject, a flexural phononic crystal, offering exciting prospects for the ultrafast manipulation of states in 2D materials in emerging quantum technologies.

Citation

Yan, W., Akimov, A. V., Barra-Burillo, M., Bayer, M., Bradford, J., Gusev, V. E., …Linnik, T. L. (2022). Coherent Phononics of van der Waals Layers on Nanogratings. Nano Letters, 22(16), 6509-6515. https://doi.org/10.1021/acs.nanolett.2c01542

• Journal Article Type: Article
• Acceptance Date: Aug 5, 2022
• Online Publication Date: Aug 12, 2022
• Publication Date: Aug 12, 2022
• Deposit Date: Aug 24, 2022
• Publicly Available Date: Aug 25, 2022
• Journal: Nano Letters
• Print ISSN: 1530-6984
• Electronic ISSN: 1530-6992
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 22
• Issue: 16
• Pages: 6509-6515
• DOI: https://doi.org/10.1021/acs.nanolett.2c01542
• Keywords: Mechanical Engineering; Condensed Matter Physics; General Materials Science; General Chemistry; Bioengineering
• Public URL: https://nottingham-repository.worktribe.com/output/9906702
• Publisher URL: https://pubs.acs.org/doi/10.1021/acs.nanolett.2c01542