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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.

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Anne Mclaren Research Fellowship

Principal Research Fellow

María Barra-Burillo

Manfred Bayer

Vitalyi E. Gusev

Luis E. Hueso

Professor of Physics

Serhii Kukhtaruk

Achim Nadzeyka

Amalia Patanè

Alexey V. Scherbakov

Dmytro D. Yaremkevich

Tetiana L. Linnik


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.

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 (ACS)
Peer Reviewed Peer Reviewed
Volume 22
Issue 16
Pages 6509-6515
Keywords Mechanical Engineering; Condensed Matter Physics; General Materials Science; General Chemistry; Bioengineering
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