Andrea Schiaffino was that morning very nervous for the defense, and specially for the questions he would receive. But he managed to defend his thesis perfectly, and answer all the questions of the committee! His colleagues gave him, after the defense, an inflatable boat, to bring with his sailing boat. Enjoy sailing, Dr. Andrea!
First-principles theory of flexoelectricity: methods and applications
by Andrea Schiaffino, Theory and Simulations Group, ICMAB-CSIC
Date: Tuesday, 2 July 2019
Time: 11 am
Venue: Sala d'actes Carles Miravitlles, ICMAB-CSIC
Andrea and his sailing boat (photo: Carlos Frontera)
Abstract: This thesis is focused on the microscopic theoretical description of flexoelectricity that is the universal property of insulators of developing a polar response to a uniform strain gradient perturbation. The first part of the presentation will cover the most recent developments concerning the calculation of the bulk flexoelectric tensor by using density functional theory, with major emphasis on introducing the original concept of the metric-wave perturbation in crystals.In the second part, the effects of flexoelectricity in two concrete physical systems are discussed. First, the feasibility of engineering the flexoelectric response to enhance the photovoltaic performance of single crystals (flexovoltaic) is discussed; second, the origin of the polarity at the ferroelastic domain walls in SrTiO3 is analyzed using an effective model.
- Dr. Massimiliano Stengel, ICREA Research Professor, ICMAB-CSIC
- President: Dr. Ivo Souza, Centro de Física de Materiales, Universidad del País Vasco, Ikerbasque Foundation, Spain
- Secretary: Dr. Gustau Catalan, Institut Català de Nanociència i Nanotecnologia (ICN2), Spain
- Vocal: Dr. Raffaele Resta, Istituto Officina dei Materiali, CNR (Trieste), Italy
Celebrating the thesis after the defense.