Properties of domains and topological excitations in nanoscale ferroelectrics
CMMP Seminar
3:30 pm –
4:30 pm
Jorgensen Hall Room: 145
Igor Lukyanchuk, University of Picardie, France
Functionalization of ferroelectric materials emerged the growing interest in the exploration of such nano-scale self-organized structures as polarization domains. For a long time, it was believed that the regular domain patterns can appear only in ferromagnetic systems. However, it was convincingly demonstrated over the last decade that the steady Landau-Kittel polarization domains do arise in the nano-scale strained films, superlattices nanorods, and nano dots. Several recent results concerning their dynamic and static properties will be reviewed. First, we consider the formation of domains in ultrathin films and superlattices of ferroelectric oxides and report a comprehensive description of their electrodynamic response. In particular, we demonstrate that the field-induced domain wall motion can be in the origin of the recently observed fascinating “negative capacitance effect” effect. Then, we show that the frequency-dependent permittivity of such system reveals the collective resonance mode in the near-terahertz frequency range that can be excited and detected by the methods of reflection absorption spectrometry. This finding can provide an important impact on the development of the ferroelectric-based terahertz optics and plasmonics. Finally, we consider the unconventional multibit polarization switching in ferroelectric nanodots, with the formation of the intermediate domain states or/and vortices and chiral polarization skyrmions that can be useful for the design of the memory-storage devices.
Brief CV:
Ph.D.: Theoretical and Mathematical Physics L. D. Landau Institute for Theoretical Physics, Moscow 1990
Professor of Jules Verne University, (UPJV), Amiens, France, since 2001
Research Scientists in Institute of Laue Langevin (ILL), Grenoble, France 2001
Research Scientists in Rheinisch Westfalische Technische Hochschule (RWTH), Aachen, Germany, 1999-2000
Visiting Research Scientists in Technische Hochschule (ETH), Zurich, Switzerland, January-March 2000
Visiting Professor in Federal University of Minas Gerais, Brazil 1996-98
Research Scientists, Visiting Professor (DR2 CNRS & PAST) in University of Montpellier, France - 1992-96
Research Scientists in Rheinisch Westfalischen Technischen Hochschule (RWTH), Aachen, Germany - 1991-92
Research Scientist in L. D. Landau Institute for Theoretical Physics, 1990 – 91 (associated member since 1991)
Functionalization of ferroelectric materials emerged the growing interest in the exploration of such nano-scale self-organized structures as polarization domains. For a long time, it was believed that the regular domain patterns can appear only in ferromagnetic systems. However, it was convincingly demonstrated over the last decade that the steady Landau-Kittel polarization domains do arise in the nano-scale strained films, superlattices nanorods, and nano dots. Several recent results concerning their dynamic and static properties will be reviewed. First, we consider the formation of domains in ultrathin films and superlattices of ferroelectric oxides and report a comprehensive description of their electrodynamic response. In particular, we demonstrate that the field-induced domain wall motion can be in the origin of the recently observed fascinating “negative capacitance effect” effect. Then, we show that the frequency-dependent permittivity of such system reveals the collective resonance mode in the near-terahertz frequency range that can be excited and detected by the methods of reflection absorption spectrometry. This finding can provide an important impact on the development of the ferroelectric-based terahertz optics and plasmonics. Finally, we consider the unconventional multibit polarization switching in ferroelectric nanodots, with the formation of the intermediate domain states or/and vortices and chiral polarization skyrmions that can be useful for the design of the memory-storage devices.
Brief CV:
Ph.D.: Theoretical and Mathematical Physics L. D. Landau Institute for Theoretical Physics, Moscow 1990
Professor of Jules Verne University, (UPJV), Amiens, France, since 2001
Research Scientists in Institute of Laue Langevin (ILL), Grenoble, France 2001
Research Scientists in Rheinisch Westfalische Technische Hochschule (RWTH), Aachen, Germany, 1999-2000
Visiting Research Scientists in Technische Hochschule (ETH), Zurich, Switzerland, January-March 2000
Visiting Professor in Federal University of Minas Gerais, Brazil 1996-98
Research Scientists, Visiting Professor (DR2 CNRS & PAST) in University of Montpellier, France - 1992-96
Research Scientists in Rheinisch Westfalischen Technischen Hochschule (RWTH), Aachen, Germany - 1991-92
Research Scientist in L. D. Landau Institute for Theoretical Physics, 1990 – 91 (associated member since 1991)