Felipe H. da Jornada Wins Kavli Energy NanoScience Institute Prize

The Kavli Energy NanoScience Institute Thesis Prize Selection Committee selected C2SEPEM postdoctoral scholar, Felipe H. da Jornada, to receive the 2016-2017 Best Thesis Prize.

The prize is given to the student with the outstanding thesis, publication status, strength of supporting letters and relevance of the thesis to the Kavli ENSI mission. The award provides a $2,000 stipend and an award certificate. Congratulations!

Learn more: kavli.berkeley.edu/student-thesis-prize-awards

Quasiparticle and Optical Properties of Quasi-Two-Dimensional Systems

Advisor: Professor Steven G. Louie, UC Berkeley Department of Physics

Since the experimental isolation of graphene in 2004, there has been tremendous interest in studying quasi-2D systems. These materials are atomically thin, and display many fascinating properties not found in regular bulk materials. Their high carrier mobility, high optical absorption, and tunable electronic properties make these quasi-2D materials ideal building blocks for next-generation chips and solar-cell devices. My dissertation seeks to explain, from a fundamental physics perspective, why these quasi-2D materials behave like this. In order to give unbiased predictions of how these systems behave, we use theoretical frameworks that do not rely on experimental fitting parameters, and use supercomputers to perform calculations. We show that many of these interesting electronic and optical properties stem from the weak electronic screening in these materials, which a result of their reduced dimensionality and which often cannot be accounted for with simpler models. We also introduce new computational approaches to make these calculations much faster and more realistic, and we show, for instance, that even the substrate that holds these materials in experiments can dramatically influence the measured properties.