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THOMAS YOUNG CENTRE Soiree - Electrons, photons and phonons in complex materials

Image: Dr Bittner/Dr Monserrat
Dr Bittner/Dr Monserrat

Date: 14 March 2019   Time: 16:00 - 18:00

Electrons, photons and phonons in complex materials, with Eric Bittner, University of Houston and Bartomeu Monserrat, University of Cambridge.

Biography
Eric R. Bittner, FRSC is a theoretical chemist, physicist, and distinguished professor of chemical physics at the University of Houston. Bittner obtained his B.S. in chemistry and in physics from Valparaiso University in 1988. He worked with John C. Light at the University of Chicago and obtained his Ph.D. thesis in 1994 in quantum scattering theory. Subsequently, he worked at the University of Texas at Austin until 1996 as Postdoctoral Fellow of the National Science Foundation, with Peter J. Rossky as his mentor. He was visiting scholar at Stanford University from 1995 to 1997, with Hans C. Andersen as his mentor. In 1997 he joined the University of Houston as assistant professor of theoretical chemistry and is currently the Moores Professor in Chemical Physics. Prof Bittner is Guggenheim Fellow, and has held a Fullbright Canada Fellowship. He is also a Fellow of the American Physical Society and the Royal Society of Chemistry. He is currently the Leverhulme Trust Visiting Professor in Physics at Durham. His main research interests lie with the dynamics of molecules in their excited electronic states and broadly include condensed matter physics, organic photovoltaics, strong coupling, and quantum information.


Bartomeu Monserrat: Optical excitations in solids at room temperature

Abstract:
Technological devices such as solar cells, light emitting diodes, and flat panel displays rely on the underlying optoelectronic properties of their constituent materials for their optimal operation. Understanding the quantum mechanical processes of light absorption and emission is essential for pushing these technologies forward. In particular, practical devices need to operate around room temperature, requiring a microscopic first principles description that includes the interaction between electron and the crystal lattice.

In this talk, I will describe our recent developments for the study of finite temperature optoelectronic properties in semiconductors, with a particular emphasis on the role of electron-phonon and exciton-phonon interactions. I will illustrate these developments with a range of examples including finite temperature optical absorption across both indirect and dipole forbidden semi-conducing gaps, luminescence driven by exciton-phonon coupling in hexagonal boron nitride, and spin-dependent exciton-phonon coupling in organic molecular crystals.

Biography
Dr Bartomeu Monserrat is a Winton Advanced Research Fellow working at the Cavendish Laboratory, University of Cambridge. His research focuses on the development of first principles quantum mechanical methods to study material properties, with a particular emphasis on excitations in semiconductors, topological order, superconductivity, and high pressure physics. He holds a MSci Physics degree from Imperial College London (2011), a PhD in Physics from the University of Cambridge (2015), and spent two years at Rutgers University as a postdoctoral researcher (2015-17). His work was recognised with the 2018 Psi-K Volker Heine Young Investigator Award.

Location:  Ramsay LT, Christopher Ingold Building, UCL, followed by a reception in the Nyholm room (UCL)