Mr Benjamin Ash

PhD Project

Microphononic Crystals  

Supervisors: Prof Geoff Nash and Prof Pete Vukusic

The aim of this project is to investigate the properties of surface acoustic wave (SAW) devices containing phononic crystals [1], and to explore the integration of these with 2D materials (e.g. graphene). The ultimate aspiration of this work is to use phononic crystals to guide and control the acoustic waves and in-turn to use these waves to manipulate charge within the 2D material, particularly single carriers, in both conventional and quantum devices. It builds upon our recent work demonstrating acoustically driven charge transport in graphene [2].

The development of phononic crystals at the micron scale has received relatively little attention and there is an opportunity to develop new approaches to this. The interaction between SAWs and graphene has also received very little attention. The combination of SAWs, phononic crystals and charge manipulation in graphene has not been reported so far.

[1] See, for example, S. Benchabane et al, Physical Review E 73, 065601R (2006).
[2] L. Bandhu, L. M. Lawton and G. R. Nash, “Macroscopic acoustoelectric charge transport in Graphene”, Appl. Phys. Lett. 103, 133101 (2013).