FWI Institutskolloquium: Effects of quantum interference in quantum rings and 3D nanoprinted structures

Datum

14.09.2026

Zeit

09:30 - 11:00

Sprecher

Vladimir Fomin, IFW Dresden

Sprache

en

Hauptthema

Physik

Host

Helmut Schultheiß

Beschreibung

Abstract: Quantum rings are a special class of modern high-tech nanostructures, which provide a unique playground for the quantum-mechanical paradigm and topological physics [1]. I will represent their formation by molecular beam epitaxy and droplet epitaxy of semiconductors as well as their topology-driven electronic, optical, and magnetic properties. Highly complex theoretical models will be discussed which have been developed to adequately explain the specific features of quantum rings. I will provide an ample presentation of the recent advancements in the physics of quantum rings related to spin dynamics and the spin-orbit interaction (spin interference in Rashba rings, tunable exciton topology on type II InAs/GaAsSb quantum nanostructures), the electron-phonon interaction in ring-like structures, quantum-interference manifestations in novel materials (e.g., graphene cylinders, cyclocarbons, MoS2), effects of electric field and THz radiation on optical properties of quantum rings and quantum-ring molecules. Special emphasis will be made on fascinating novel effects emerging due to double-connectedness in various physical systems, embracing the occurrence of the continuous geometric phase provoking formation of non-integer mode numbers in Möbius microring light cavities, the inverse Faraday effect on the generation of current states in an array of superconductor nanorings, and the emergence of lightning-like magnetic flux bursts into a macroscopic superconductor ring. The frontline methods of fabrication and characterization of quantum rings together with the sophisticated cutting-edge theoretical research and numerical simulations have allowed for accumulation of a significant thesaurus of fundamental information on their behavior. This highly diversified knowledge underpins numerous suggestions for prospective applications of nanostructures with nontrivial topology, like quantum rings and 3D nanoprinted arrays, as a highly tunable elemental base for future device design and optimization in optoelectronics, spintronics, information storage and processing, as magnetic memory elements as well as photonic sources and detectors. Reference 1. V. M. Fomin (Ed.), Physics of Quantum Rings, 3rd edition (Springer International Switzerland, Cham, 2025).

Letztmalig verändert: 11.09.2026, 07:38:27