Associate Professor of Mechanical Engineering and Materials Science
Associate Professor of Physics (Secondary)
Associate Professor of Chemistry (Secondary)
Faculty Network Member of The Energy Initiative
Olivier Delaire's research program investigates atomistic transport processes of energy and charge, and thermodynamics in energy materials (DOE Early Career Award 2014). His research group studies elementary excitations in condensed-matter systems (phonons, electrons, spins), their couplings (phonon-phonon interaction, electron-phonon coupling, spin-phonon coupling), and their effects on macroscopic material properties. Current materials of interest include thermoelectrics, ferroelectrics/multiferroics, spin-caloritronics, and photovoltaics. We develop new methods to reveal microscopic underpinnings of thermal transport, by integrating neutron and x-ray scattering measurements with quantum-mechanical computer simulations. This combined experimental and computational approach opens a new window to understand and control microscopic energy transport for the design of materials with novel properties (thermoelectrics, spin-caloritronics), and to rationalize multiferroics and metal-insulator transitions. In addition to state-of-the-art scattering experiments and first-principles simulations, our team also uses transport measurements, optical spectroscopy, materials synthesis, calorimetry, and thermal characterization, with the goal of gaining deeper atomistic understanding for developing future materials.
Specht, E. D., et al. “Nanoscale Structure in AgSbTe2 Determined by Diffuse Elastic Neutron Scattering.” Journal of Electronic Materials, vol. 44, no. 6, June 2015, pp. 1536–39. Scopus, doi:10.1007/s11664-014-3447-0. Full Text
Delaire, O., et al. “Heavy-impurity resonance, hybridization, and phonon spectral functions in Fe(1−x)M(x)Si (M=Ir, Os).” Physical Review B, vol. 91, no. 9, Mar. 2015. Manual, doi:10.1103/PhysRevB.91.094307. Full Text
Jiang, M. P., et al. Photoinduced suppression of the ferroelectric instability in PbTe. 2015.
Chen, Xi, et al. “Twisting phonons in complex crystals with quasi-one-dimensional substructures.” Nature Communications, vol. 6, Jan. 2015, p. 6723. Epmc, doi:10.1038/ncomms7723. Full Text
Li, C. W., et al. “Anharmonicity and atomic distribution of SnTe and PbTe thermoelectrics.” Physical Review B Condensed Matter and Materials Physics, vol. 90, no. 21, Dec. 2014. Scopus, doi:10.1103/PhysRevB.90.214303. Full Text
Budai, John D., et al. “Metallization of vanadium dioxide driven by large phonon entropy.” Nature, vol. 515, no. 7528, Nov. 2014, pp. 535–39. Epmc, doi:10.1038/nature13865. Full Text
Ma, J., et al. “Phonon scattering rates and atomic ordering in Ag(1−x)Sb(1+x)Te(2+x) (x=0, 0.1, 0.2) investigated with inelastic neutron scattering and synchrotron diffraction.” Physical Review B, vol. 90, no. 13, Oct. 2014. Manual, doi:10.1103/PhysRevB.90.134303. Full Text
Lara-Curzio, E., et al. “Low-temperature heat capacity and localized vibrational modes in natural and synthetic tetrahedrites.” Journal of Applied Physics, vol. 115, no. 19, May 2014. Scopus, doi:10.1063/1.4878676. Full Text
Li, C. W., et al. “Phonon self-energy and origin of anomalous neutron scattering spectra in SnTe and PbTe thermoelectrics.” Physical Review Letters, vol. 112, no. 17, May 2014, p. 175501. Epmc, doi:10.1103/physrevlett.112.175501. Full Text
Carlton, C. E., et al. “Natural nanostructure and superlattice nanodomains in AgSbTe2.” Journal of Applied Physics, vol. 115, no. 14, Apr. 2014. Scopus, doi:10.1063/1.4870576. Full Text