Control of Elementary Excitations by Acoustic Fields

Interaction of surface acoustic waves with epitaxial graphene

Graphene is emerging as an important material for electronic applications due to its two-dimensional, planar character and high carrier mobility, which persists up to room temperatures. These favourable properties open the way for exploring carrier control processes alternative to the direct application of electric fields. A particularly interesting approach employs the strain and piezoelectric fields generated by a surface acoustic wave (SAW). The moving and tuneable character of these fields allow for the effective capture of carriers and their transport at the well-defined velocity of the SAW.

 

This project investigates the interaction of SAWs with epitaxial graphene layers grown on SiC. SAWs modulate the graphene band structure and interact strongly with carriers. We explore these features for the controlled transport of carriers and spins in graphene layers. This, in turn, requires a better knowledge of the momentum transfer process from SAWs to carriers in graphene, as well as the effect of the SAW-induced strain and piezoelectric fields into the electronic band structure and spin-splitting.

 

The project has been funded by the Priority Program 1459 "Graphene" of the Deutsche Forschungsgemeinschaft (DFG), and the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 642688.

Selected publications:

5 Author R. Fandan , J. Pedros , A. Hernández-Mínguez , F. Iikawa , P. V. Santos , A. Boscá , F. Calle
Title

Dynamic local strain in graphene generated by surface acoustic waves

Source Nano Lett. , 20 , 402 ( 2020 )
DOI : 10.1021/acs.nanolett.9b04085 | Download arXiv: 1909.12685 | 3162 Cite : Bibtex RIS
R. Fandan, J. Pedros, A. Hernández-Mínguez, F. Iikawa, P. V. Santos, A. Boscá, and F. Calle

4 Author A. Hernández-Mínguez , Y.-T. Liou , P. V. Santos
Title

Interaction of surface acoustic waves with electronic excitations in graphene

Source J. Phys. D , 51 , 383001 ( 2018 )
DOI : 10.1088/1361-6463/aad593 | Download arXiv: 1811.00040 | 3028 Cite : Bibtex RIS
A. Hernández-Mínguez, Y.-T. Liou, and P. V. Santos

3 Author Y.-T. Liou , A. Hernández-Mínguez , J. Herfort , J. M. J. Lopes , A. Tahraoui , P. V. Santos
Title

Acousto-electric transport in MgO/ZnO-covered graphene on SiC

Source J. Phys. D , 50 , 464008 ( 2017 )
DOI : 10.1088/1361-6463/aa8e8a | Download arXiv: 1708.05236 | 2954 Cite : Bibtex RIS
Y.-T. Liou, A. Hernández-Mínguez, J. Herfort, J. M. J. Lopes, A. Tahraoui, and P. V. Santos

2 Author A. Hernández-Mínguez , A. Tahraoui , J. M. J. Lopes , P. V. Santos
Title

Acoustoelectric transport at gigahertz frequencies in coated epitaxial graphene

Source Appl. Phys. Lett. , 108 , 193502 ( 2016 )
DOI : 10.1063/1.4949756 | Download: PDF | 2779 Cite : Bibtex RIS
A. Hernández-Mínguez, A. Tahraoui, J. M. J. Lopes, and P. V. Santos

1 Author P. V. Santos , T. Schumann , M. H. Oliveira Jr. , J. M. J. Lopes , H. Riechert
Title

Acousto-electric transport in epitaxial monolayer graphene on SiC

Source Appl. Phys. Lett. , 102 , 221907 ( 2013 )
Download: PDF | 2405 Cite : Bibtex RIS
P. V. Santos, T. Schumann, M. H. Oliveira Jr., J. M. J. Lopes, and H. Riechert