Condensed Matter / Biophysics Seminars |
Fall 2023 |
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Condensed Matter/Biophysics Seminars
Mondays at 4:05pm in 2205 NPB
Committee: Yuxuan Wang, Xiao-Xiao Zhang and BingKan Xue |
August 28 |
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September 4 |
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September 11 |
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September 18 |
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September 25 |
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| Speaker | Youngmin Park, UF Math | |
| Title | High-Order Accuracy Computation of Coupling Functions for Strongly Coupled Oscillators | |
| Abstract | We develop a general framework for identifying phase reduced equations for finite populations of coupled oscillators that is valid far beyond the weak coupling approximation. This strategy represents a general extension of the theory from [Wilson and Ermentrout, Phys. Rev. Lett 123, 164101 (2019)] and yields coupling functions that are valid to higher-order accuracy in the coupling strength for arbitrary types of coupling (e.g., diffusive, gap-junction, chemical synaptic). These coupling functions can be used to understand the behavior of potentially high-dimensional, nonlinear oscillators in terms of their phase differences. The proposed formulation accurately replicates nonlinear bifurcations that emerge as the coupling strength increases and is valid in regimes well beyond those that can be considered using classic weak coupling assumptions. We demonstrate the performance of our approach through two examples. First, we use diffusively coupled complex Ginzburg-Landau (CGL) models and demonstrate that our theory accurately predicts bifurcations far beyond the range of existing coupling theory. Second, we use a realistic, synaptically coupled, conductance-based models of a thalamic neuron and show that our theory correctly predicts asymptotic phase differences for non-weak synaptic coupling. In both examples, our theory accurately captures model behaviors that weak coupling theories cannot. | |
| Host | Juan Guan, Bingkan Xue, and Yoonseok Lee | |
October 2 |
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| Speaker | Denis Karaiskaj, University of South Florida | |
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October 9 |
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| Speaker | Nicolas Silva, UF Maglab HighB/T | |
| Title | Spherical Neutron Polarimetry at Oakridge National Laboratory | |
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October 16 |
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October 23 |
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October 30 (via Zoom) |
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| Speaker | Orit Peleg, University of Colorado Boulder | |
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| Host | BingKan Xue | |
November 6 |
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| Speaker | Yingying Wu, UF ECE | |
| Title | Towards Ultralow-Power and Scalable 2D Topological Spintronics Using Quantum Devices | |
| Abstract | The current electronics industry is facing challenges both from the fundamental physics limit of silicon on the small scale, and the new demand for big-data applications on the large scale. Spintronics, utilizing spin degree of freedom, is a promising for future beyond-CMOS devices and systems, thanks to their low power consumption, nonvolatility, and easy 3D integration. The emerging 2D magnets can preserve single-phase magnetism even in monolayer (~0.8 nm) limits, and thus they are promising to further scale down devices. They have a sharp interface and atomically thin nature, promising for designer quantum devices and more functionalities (e.g. stacking order, twist angle, thickness, and voltage control).
In this talk, I will discuss 2D spintronics with quantum devices on skyrmions and antiferromagnets, and their potential applications. I will begin by presenting my observations of real-space topological spin textures - magnetic skyrmions. This work represents the first report of skyrmion lattice imaging in 2D layered magnets. Building on this, I will present my findings on the vertical imprinting of skyrmions onto neighboring layers in a 2D ferromagnet/2D ferromagnet system, demonstrating new functionality for skyrmion-based spintronics. I will then discuss the exchange coupling and voltage controlled 2D antiferromagnetism in devices, a step towards ultralow-power and ultrafast spintronics. In addition, future work on quantum devices is motivated that would focus on energy-efficient control in magnetism, for neuromorphic and quantum computing. |
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November 13 |
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| Speaker | Gordon Berman, Emory University | |
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November 20 |
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| Speaker | Ryan Need, UF Materials Science and Engineering | |
| Title | Ordered States in Disordered Magnets and Superconductors | |
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November 27 |
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December 4 |
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December 11 |
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Condensed Matter / Biophysics Seminars |
Spring 2024 |
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Condensed Matter/Biophysics Seminars
Mondays at 4:05pm in 2205 NPB
Committee: Yuxuan Wang, Xiao-Xiao Zhang and BingKan Xue |
January 8 |
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January 15 |
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January 22 |
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January 29 |
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February 5 |
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February 12 |
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February 19 |
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February 26 |
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March 4 |
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March 18 |
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March 25 |
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April 1 |
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April 8 |
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