Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session C09: Dielectric and Ferroic Oxides - Elastic Phenomena
2:30 PM–5:54 PM,
Monday, March 5, 2018
LACC Room: 301A
Sponsoring Unit: DMP
Chair: Muhtar Ahart, Carnegie Institute of Washington
Abstract: C09.00001 : New functionalities from gradient couplings: Flexoelectricity and more*
2:30 PM–3:06 PM
(ICMAB-CSIC and ICREA)
(ICMAB-CSIC and ICREA)
(Physics and Astronomy, Rutgers Univiversity)
Flexoelectricity, the coupling between an inhomogeneous deformation and the electrical polarization, has emerged a "hot" topic in modern materials science due to its cross-cutting relevance to many phenomena of fundamental and technological interest. Understanding the intriguing physics that governs its behaviour at the nanoscale is crucial to harnessing the potential of strain gradients in practical applications, and such a progress requires a substantial support from theory. Due to the inherent breakdown of lattice periodicity that a strain gradient entails, however, first- principles calculations of flexoelectricity remain technically challenging at several levels. In this talk, I will discuss the recent methodological developments that have made such calculations feasible, and their application to realistic materials systems. In particular, I will focus on manifestations of the flexoelectric effect in SrTiO3, either at the level of the bulk crystal, surfaces or ferroelastic twin boundaries. More generally, I will emphasize the opportunities that spatial gradients (e.g. a nonuniform polarization, strain or magnetization field) offer for materials design, by enabling functionalities that would be otherwise forbidden in a uniform crystalline phase.
*Supported by MINECO-Spain through Grants No. FIS2013-48668-C2-2-P, No. MAT2016- 77100-C2-2-P and No. SEV-2015-0496; by Generalitat de Catalunya (Grant No. 2014 SGR301); by the European Research Council (ERC), Grant Agreement No. 724529.
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700