Bulletin of the American Physical Society
86th Annual Meeting of the APS Southeastern Section
Volume 64, Number 19
Thursday–Saturday, November 7–9, 2019; Wrightsville Beach, North Carolina
Session B02: Materials Under Extreme Conditions and Far From Equilibrium |
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Chair: Lex Kemper, North Carolina State University Room: Holiday Inn Resort Airlie/Tidewater |
Thursday, November 7, 2019 11:00AM - 11:30AM |
B02.00001: Designing, Synthesizing and Characterizing Rare-Earth Based Frustrated Quantum Magnets Invited Speaker: Sara Haravifard Frustrated quantum magnets are systems for which the exchange interactions governing the interacting spins cannot be simultaneously satisfied, leading to a highly degenerate ground state and new states of matter such as Quantum Spin Liquids. In geometrically frustrated systems, competition between neighboring spin interactions arises from the geometry of the lattice. Recently Rare-Earth base geometrically frustrated systems have attracted much attention due to the strong spin-orbit coupling and anisotropy of the exchange interactions. In this talk, I will discuss our recent progress in designing, synthesizing and characterizing Rare-Earth based 2-dimensional and 3-dimensional frustrated magnets. I will present our magnetic and thermal measurements as well as our recent neutron scattering results. [Preview Abstract] |
Thursday, November 7, 2019 11:30AM - 12:00PM |
B02.00002: Probing Carrier Dynamics in Perovskite via Ultrafast Laser Spectroscopy Invited Speaker: He Wang Organic-inorganic hybrid perovskites have received considerable research interests for their applications in solar cells. The process of converting from photon to separated charge carriers includes multiple dynamic processes. We study these dynamic processes in perovskite solar cells by femtosecond laser transient absorption and transient reflection spectroscopies. For example, we utilize these techniques to probe coherent phonon and charge transfer between different phases. I will also talk about interfacial charge transfer and diffusion at the interface between perovskite and charge transport layer, that can largely affect the device performance. \\ \\ In collaboration with: Meng Zhou, Chengbin Fei, Julio Sarmiento, University of Miami [Preview Abstract] |
Thursday, November 7, 2019 12:00PM - 12:30PM |
B02.00003: Ultrafast Angle-Resolved Light Scattering Metrology of Quantum Materials Invited Speaker: Sergiy Lysenko Time-domain studies of nonequilibrium dynamics in quantum materials are critical to obtaining accurate information about electronic and structural degrees of freedom. The understanding of excited states in these materials is the subject of great interest in theoretical and experimental condensed matter physics. Here we report on ultrafast optical and structural dynamics of correlated vanadium oxides and plasmonic materials. Using time- and angle-resolved light scattering techniques, we trigger the insulator-metal transition and probe excited states with femtosecond resolution. 3D light scattering enables visualization of nonequilibrium dynamics, including coherent phonon response, of local mesoscale domains with different sizes and orientations. It is shown that the tensile and compressive strain in epitaxial films shifts the phase of phonon oscillations in different domains with respect to their elastic deformation. The higher misfit strain in smaller grains of epitaxial films changes the rate of insulator-metal transition. The observation of phonon mode softening in quasi-equilibrium process together with phonon dynamics upon ultrafast photoexcitation is a key step towards understanding of symmetry-breaking phenomena. To separate and characterize the ultrafast electronic and structural dynamics of phase-change-materials we developed a novel ultrafast diffraction conoscopy technique, which is based on polarization analysis of time- and angle-resolved hemispherical elastic light scattering. At room temperature, the insulator-metal transition can be observed only for a very limited range of materials, while light-induced phenomena in superconductors and other correlated materials require cryogenic temperatures. Therefore we built the ultrafast scatterometer which incorporates a 50-cm-in-diameter elliptical mirror and operates at low temperatures, down to 7K, offering new possibilities for ultrafast scattering imaging and diffractive conoscopy of quantum materials. [Preview Abstract] |
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