Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DF: Fachverband Dielektrische Festkörper
DF 15: Ferroics - Domains, Domain Walls and Skyrmions III
DF 15.3: Vortrag
Mittwoch, 22. März 2017, 15:45–16:00, WIL B321
Inner structure of topological defects in hexagonal manganites — Kostantin Shapovalov1, Megan Holtz2, Julia Mundy2, David Muller2, Zewu Yan3, Edith Bourret-Courchesne3, Dennis Meier4, and •Andrés Cano1 — 1CNRS, Univ. Bordeaux, ICMCB, Bordeaux, France — 2Cornell University, Ithaca, NY, USA — 3Lawrence Berkeley National Laboratory, Berkeley, CA — 4Norwegian University of Science and Technology, Trondheim, Norway
Structural domain walls and vortices are two different incarnations of topological defects in the hexagonal manganites RMnO3. These entities display intriguing functional features related to their local transport properties and can be regarded as analog systems for the study of the formation of cosmic strings in the early universe. We develop a field-theory description of their inner structure supporting the experimental characterization of these defects by means of HAADF scanning transmission electron microscopy. Our theory reveals novel features such as the emergence of a continuous U(1) symmetry at the vortex cores and a multipolar charge (re-)distribution that become universal in these regions. These inner features are expected to bring forth an additional degree of functionality to these topological defects.