Shi Liu
Carnegie Fellow
(202) 478-8915

Shi Liu joins the Geophysical Laboratory from the University of Pennsylvania as a postdoctoral fellow. Shi is working with Ron Cohen on multi scale simulations of dynamical responses of ferroelectric domains, to fundamentally understand various structure-property relationships of ferroelectric domain walls and to discover, develop and demonstrate new material design principles. His research interests focus on materials exploration and design using both advanced quantum chemistry and large-scale molecular dynamics simulations.

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Piezoelectric materials are a class of smart materials that can convert electrical energy to mechanical energy and vice versa. Developing new piezoelectrics for novel electromechanical device applications has been a long-lasting interest, both scientifically and technologically. Nearly all known piezoelectrics possess positive longitudinal piezoelectric coefficients: the lattice expands when applying an electric field along the polar axis. The negative response, a material contracting in response to an applied electric field, has been considered a rare and counterintuitive anomaly.  However, there is no fundamental physics preventing the realization of negative response. In the work recently published in Physical Review Letters, the Geophysical Laboratory's Shi Liu and Ron Cohen showed that the negative response is not so rare after all.
Washington, DC—It would be difficult to overestimate the importance of silicon when it comes to computing, solar energy, and other technological applications. (Not to mention the fact that it makes up an awful lot of the Earth’s crust.) Yet there is still so much to learn about how to harness the capabilities of element number 14.
The Geophysical Laboratory's Postdoctoral Fellow Shi Liu was awarded the 2017 APS Metropolis Award in late October.  The purpose of the award is to recognize doctoral thesis research of outstanding quality and achievement in computational physics and to encourage effective written and oral presentation of research results.