Unusual heat flow revealed with first principles theoretical approaches
November 14, 2016 -
3:00pm to 4:00pm
Pettit Building, (Microelectronics Research Center), Room 102 A & B, 791 Atlantic Drive NW, Atlanta, GA 30332
Phonons determine the thermal properties of materials as well as mediating electronic transport. Our research has focused on the physics of phonons, with an emphasis on developing ab initio theoretical descriptions of thermal properties and phonon thermal transport. This parameter-free theory has yielded excellent agreement with the measured thermal conductivities of a wide range of materials, validating its predictive capability and contributing insight into the nature of heat flow. Examples of such insight include: a new paradigm for achieving ultrahigh thermal conductivity in bulk crystals, and the prediction that phonon hydrodynamic behavior such as Poiseuille flow and second sound can occur in graphene at unusually high temperatures. I will also discuss some new directions we’ve initiated involving phonons interacting with electrons, plasmons and magnons.