Within the line of sound-matter interaction we study the multitude of possibilities sound waves can couple to solid media while interacting with other types of waves. Acousto-electricity deals with piezoelectric semiconductors where we try to understand how the acoustic waves respond when such material is biased by an electric DC field. Amplification can be controlled and tunes and is the key ingredient in synthesized phononic Parity-Time symmetry media.
We also model the mechanical influence on 2D materials such as graphene where we study the electronic and plasmonic modifications aided by sound.
W. Wang, B.-H. Li, N. A. Mortensen, and J. Christensen
“Localized surface plasmons in vibrating graphene nanodisks”
Nanoscale 8, 3809 (2016). [pdf]
J. Christensen. M. Willatzen. V. R. Velasco and M.-H. Lu,
“Parity-time synthetic phononic media”
Phys. Rev. Lett 116, 207601 (2016). [pdf]