Communications
April 9th, 2024
Joint Workshop of HORIZON-EU networks:
MSCA-RISE-MELON & WIDERA-FerroChiral :
Invited talk "Topological polarization states in nanostructured ferroelectrics"
Emergent Topological Chirality in Ferroics
The past decade marked breakthrough discoveries of novel topological polarization structures in nanostructured ferroelectrics. The observed polarization structures have been interpreted in terms of the real-space vector field topology as multiple combinations of vortices, skyrmions, merons, and other topological formations, previously observed in magnetic systems. However, this visible analogy misses ferroelectricity's cornerstone, the dominant role of the long-range electrostatic forces. In this talk, we present a generic topological foundation of ferroelectricity arising from its electrostatic essence and discuss from this viewpoint the recent trends in the field. We review the observed polarization topological structures and show that their rich variety can be exhaustively described by the fundamental formations, vortices, and Hopfions. Remarkably, the emergence of the latter provides the chirality of the confined ferroelectric systems. We focus on insights into the topological origin of the chirality in the nanostructured ferroelectrics, bringing new controllable functionalities. We pay special attention to novel developments enabling tunability and manipulating the chiroptical response in ferroelectric nanoparticles and nanodots.
Workshop "Nanomaterials for neuromorphic computing and energy harvesting"
March 14-18, 2023, San Carlos de Bariloche, Argentina
Joint Workshop of HORIZON-EU networks:
MSCA-RISE-ENGIMA, MSCA-RISE-MELON &
WIDERA-TALENTS-FerroChiral :
Invited talk "Ferroelectrics in the vicinity of quantum critical point: towards tunable topological chirality"
APS March Meeting 2023
March 5-10, 2023, Las Vegas, USA
The APS March Meeting brings together scientists and students from around the world to connect and collaborate across academia, industry, and major labs. Students, early-career physicists, and experienced professionals benefit from the networking and learning at the March Meeting.
Oral talk "Properties of incipient ferroelectrics in the vicinity of quantum critical point "
S. Kondovych, Y. Tikhonov, M. Pavlenko, A. Razumnaya, V. Vinokur, I. Luk'yanchuk. “Topological polar phases in confined ferroelectrics”
FINI 2023
November 24-25, 2022, Novo Mesto, Slovenia
7th International Conference on the Development of Industrial Engineering: Opportunities, Potentials, Challenges
The purpose of the conference is to activate and implement practices of international conferences with an emphasis of collaboration among businesses and higher education institutions. The aim is to ensure uniformity of developing tendencies to the growing need of key employees from technical and industrial fields that would consequently lead to alignment of labour market needs, business development, economic competitiveness and as a result the needs of societal and cultural environments. The conference covers several thematic sections and joins delegates from leading industrial corporations, research institutes as well as higher education institutions from Slovenia and abroad.
Oral talk "Spectral response of incipient ferroelectrics"
The ferroelectric FET with negative capacitance
Integrating negative capacitance into the field-effect transistors (FET) promises to break fundamental limits of power dissipation known as Boltzmann tyranny. However, realization of the stable static negative capacitance in the non-transient regime without hysteresis remains a daunting task. Here we put forth an ingenious design for the ferroelectric domain-based FET with the stable reversible static negative capacitance.
Data were published in Communications Physics 2, 22 (2019)
Modern microelectronics is currently facing a profound challenge. The demand for even smaller and more closely packed electronics has hit a stumbling block: the power emitted in these devices releases more heat than can be efficiently removed. Now, Professors Valerii Vinokur, Anna Razumnaya, and Igor Lukyanchuk propose a solution based on the seemingly counterintuitive phenomenon of ‘negative capacitance’. The effect is surprisingly linked to an intriguing topological structure, which is found time and again across a broad range of scientific fields.
Popular science article for broad audience published in Scientia, Mar. 30, 2022
Simulation of Hopfion structure in ferroelectric nanoparticle
Scientists find a unique knotted structure - one that repeats itself throughout nature - in a ferroelectric nanoparticle, a material with promising applications in microelectronics and computing
Published in: "Hopfions emerge in ferroelectrics" by I. Luk'yanchuk, Y. Tikhonov, A. Razumnaya, V.M. Vinokur, Nature Communications, 11, 2433 (2020)
Press Releases:
anl.gov - "Novel insight reveals topological tangle in unexpected corner of the universe"
scitechdaily.com - "Scientists Find Unique Structure"
materialstoday.com - "Hopfion knots found hiding in ferroelectric nanoparticles"
Skyrmion in ferroelectrics, switching between different states
Published in: "Controllable Skyrmion Chirality in ferroelectrics", Scientific Reports, 10, 8657 (2020)