1. Design of Graphene Phononic Crystals for Heat Phonon Engineering
- Author
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Gunter Ellrott, Hiroshi Mizuta, Ahmmed M M Hammam, Sankar Ganesh Ramaraj, Haque Mayeesha Masrura, Fayong Liu, Afsal Kareekunnan, and Manoharan Muruganathan
- Subjects
Materials science ,Band gap ,Terahertz radiation ,Phonon ,lcsh:Mechanical engineering and machinery ,Physics::Optics ,02 engineering and technology ,circle-cross-snowflake shaped nanopores ,01 natural sciences ,graphene nanomesh ,Article ,law.invention ,Crystal ,Condensed Matter::Materials Science ,Thermal conductivity ,law ,phononic bandgap ,Condensed Matter::Superconductivity ,heat phonon engineering ,0103 physical sciences ,Thermoelectric effect ,lcsh:TJ1-1570 ,Electrical and Electronic Engineering ,Electronic band structure ,010302 applied physics ,Graphene ,business.industry ,Mechanical Engineering ,021001 nanoscience & nanotechnology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Finite Element Method (FEM) simulation ,graphene phononic crystals ,Control and Systems Engineering ,Optoelectronics ,Condensed Matter::Strongly Correlated Electrons ,0210 nano-technology ,business - Abstract
Controlling the heat transport and thermal conductivity through a material is of prime importance for thermoelectric applications. Phononic crystals, which are a nanostructured array of specially designed pores, can suppress heat transportation owing to the phonon wave interference, resulting in bandgap formation in their band structure. To control heat phonon propagation in thermoelectric devices, phononic crystals with a bandgap in the THz regime are desirable. In this study, we carried out simulation on snowflake shaped phononic crystal and obtained several phononic bandgaps in the THz regime, with the highest being at &asymp, 2 THz. The phononic bandgap position and the width of the bandgap were found to be tunable by varying the neck-length of the snowflake structure. A unique bandgap map computed by varying the neck-length continuously provides enormous amounts of information as to the size and position of the phononic bandgap for various pore dimensions. We have also carried out transmission spectrum analysis and found good agreement with the band structure calculations. The pressure map visualized at various frequencies validates the effectiveness of snowflake shaped nano-pores in suppressing the phonons partially or completely, depending on the transmission probabilities.
- Published
- 2020