Prof. Samo Kralj: Effective Topological Charge Cancellation Mechanism
Povzetek:
Effective Topological Charge Cancellation Mechanism
Prof. dr. Samo Kralj
Faculty of Natural Sciences and Mathematics, University of Maribor, and Jožef Stefan Institute, Ljubljana
Topological defects (TDs) appear almost unavoidably in continuous symmetry-breaking phase transitions. Topological origin makes their key features independent of systems' microscopic details and therefore TDs display many universalities. Because of their strong impact on numerous materials' properties and their significant role in several technological applications, it is of strong interest to find simple and robust mechanisms controlling positioning and local number of TDs. In the lecture I will present our numerical study of TDs within effectively two-dimensional closed soft films exhibiting in-plane orientational ordering. We introduce the Effective Topological Charge Cancellation mechanism that efficiently predicts localized positional assembling tendency of TDs and formation of pairs {defect, antidefect} on curved surfaces and/or presence of relevant "impurities" (e.g. nanoparticles).
