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DTSTART;TZID=America/Los_Angeles:20260406T143000
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SUMMARY:MSE Seminar: Fang Liu
DESCRIPTION:Event interval: Single day eventAccessibility Contact: Matthew Yankowitz\, myank@uw.eduEvent Types: Lectures/Seminars \nTitle: Fang Liu\, Michigan Technological University\, will present "Large scale production of artificial two-dimensional superlattices." \nAbstract: Two-dimensional (2D) materials and their engineered lattices offer exciting opportunities for next-generation electronic\, optoelectronic\, and electrochemical devices. Yet\, studies of high-quality heterostructures have been largely constrained to microscopic flakes. Here\, we present scalable\, controllable top-down methods that transform a wide range of van der Waals (vdW) single crystals into twisted moiré superlattices with high yield\, exceptional uniformity\, and macroscopic dimensions from millimeters to centimeters. Access to such large-area structures has enabled new discoveries\, including ultrafast thermal exchange at bilayer interfaces\, rapid photoinduced tuning of moiré patterns\, and markedly reduced Debye temperatures in deformed monolayers compared to their isolated counterparts. Furthermore\, by patterning 1D features—such as nanoribbon arrays and nanowrinkles—on 2D monolayers\, we uncover unique electronic and thermodynamic behaviors absent in pristine layers. These advances in large-scale 2D artificial structures pave the way toward mass production and practical deployment of twistronic devices. \nBio: Dr. Fang Liu is an Assistant Professor of Chemistry at Stanford University. She started her group in 2020. Her research focuses on the light-induced dynamics of solid low dimensional materials and construction of low dimensional artificial structures. Prior to her current position\, she was a postdoctoral fellow in the group of Prof. Xiaoyang Zhu at Columbia University. Prior to working in Columbia\, she worked under the direction of Prof. Marsha I Lester at University of Pennsylvania. She received her Ph.D. in 2015 and worked as a postdoc in the same group in 2016. She received her B.S. in chemistry at Peking University in 2010.
URL:https://www.quantumx.washington.edu/calendar/mse-seminar-tbd-6/
CATEGORIES:Materials Science & Engineering
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DTSTART;TZID=America/Los_Angeles:20260413T143000
DTEND;TZID=America/Los_Angeles:20260413T153000
DTSTAMP:20260525T065456
CREATED:20251212T232721Z
LAST-MODIFIED:20260412T230044Z
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SUMMARY:MSE Seminar: Jun Xiao
DESCRIPTION:Event interval: Single day eventAccessibility Contact: Matthew Yankowitz\, myank@uw.eduEvent Types: Lectures/Seminars \nTitle: Jun Xiao\, University of Wisconsin-Madison will present "Strong THz electrodynamics and high-performance THz optoelectronics based on emergent 2D materials." \nAbstract: Terahertz (THz) sensing and imaging are critical in both quantum information technology and biomedical sensing because THz frequencies (0.1-10 THz) resonate with key low-energy information carriers (e.g.\, coherent phonons and magnons) in quantum materials and molecular vibrations in biological matter (e.g.\, skin tumor tissues and blood cells). In addition\, materials with THz response are essential building blocks for the next generation telecommunication technology. However\, the widespread use of THz technology has long been hindered by a lack of materials with strong THz light-matter interactions for high-performance devices. \nIn this talk\, I will present our recent advances in two-dimensional (2D) quantum materials to overcome these limitations by leveraging their unique topological properties and exploiting the resulting strong light-matter interactions. One remarkable example is the recently discovered nonlinear Hall effect (NHE) in 2D topological semimetals\, mediated by their diverging quantum geometrical properties . In the first part of the talk\, I will report how we use this new notion to demonstrate the long-sought THz sensing metrics . Specifically\, we have experimentally studied the unique interplay among the quantum geometrical properties\, gate-tunable electron correlation and THz electrodynamics in atomically thin topological semimetals TaIrTe4. Building upon the nonlinear Hall effect as a new mechanism for THz rectification\, we have observed a large zero-bias responsivity (~ 0.3 A/W)\, ultralow NEP (~ pW/Hz1/2)\, broadband THz response (0.1 to 10 THz) and ultrafast intrinsic speed (~ ps) at room temperature. The device performance can be further enhanced by introducing gate-tunable electron correlations. Thanks to the new topological physics and strong electron correlation\, the demonstrated device metrics show tremendous advantages over the attainable THz detectors based on other 2D materials and conventional technology. Beyond light probing\, the rich interplay physics in this platform also allows using light to induce more exotic order. If time permits\, I may present our ongoing efforts along this way.Detecting terahertz waves is only one half of the equation\, in the second half of the talk\, I will introduce our report of colossal THz emission from a van der Waals (vdW) ferroelectric semiconductor NbOI2 . Using THz emission spectroscopy\, we observe a THz generation efficiency that is an order of magnitude higher than that of ZnTe. We uncover the underlying generation mechanisms tied to its substantial ferroelectric polarization by investigating the dependence of THz emission on excitation wavelength\, incident polarization and fluence. Leveraging the long-lived coherent ferron-mediated THz emission\, we further demonstrate the ultrafast coherent amplification and annihilation of the THz emission and associated coherent ferron oscillations by using an ultrafast double-pump scheme. \nBio: Dr. Xiao is an assistant professor in the Department of Materials Science and Engineering at the University of Wisconsin-Madison from August 2021. Prior to joining Madison\, Dr. Jun Xiao worked as a postdoctoral scholar with Prof. Aaron Lindenberg and Prof. Tony Heinz at Stanford University and SLAC National Accelerator Laboratory. He earned his Ph.D. in applied science and technology from UC Berkeley (2018) under Prof. Xiang Zhang’s supervision. He received his bachelor’s degree in physics from Nanjing University (2012). His research experience and interests focus on structure-property relationships and light-matter interactions in 2D quantum materials for robust quantum computing\, efficient energy conservation and high-performance THz optoelectronics. His findings are published in many high-impact journals including Nature\, Science\, Nature Physics\, Nature Nanotechnology\, Nature Electronics and Physical Review Letters. He is the recipient of the 2023 NSF CAREER Award. 
URL:https://www.quantumx.washington.edu/calendar/mse-seminar-jun-xiao/
CATEGORIES:Materials Science & Engineering
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DTSTART;TZID=America/Los_Angeles:20260420T143000
DTEND;TZID=America/Los_Angeles:20260420T152000
DTSTAMP:20260525T065456
CREATED:20251212T232734Z
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SUMMARY:MSE Seminar: Timothy Hebrink
DESCRIPTION:Event interval: Single day eventAccessibility Contact: Matthew Yankowitz\, myank@uw.eduEvent Types: Lectures/Seminars \nTitle: Light and Energy Management Films for Improving the Energy Efficiency of Buildings\, Vehicles\, and Electronics. \nAbstract: Light and energy management play essential roles in modern life\, influencing electronic displays\, energy-efficient buildings and vehicles\, and renewable energy systems. At 3M\, significant advancements in optical film technologies-such as multilayer optical films and micro-structured films-have enabled new approaches to control\, direct\, and utilize light more effectively. This talk will introduce the fundamental science underlying these optical film technologies and highlight their applications\, including brightness enhancement in LCD displays\, solar heat rejection in architectural and automotive glazing\, and radiative cooling solutions for buildings and vehicles. These light and energy management films improve the energy efficiency of buildings\, vehicles\, and electronic applications\, and thus reduce electricity consumption or improve human comfort and safety. In alignment with 3M’s commitment to “Science Applied to Life\,” the presentation will demonstrate how scientific innovation translates into practical solutions with meaningful impact across industries and everyday experiences. \nBio: Tim Hebrink\, Corporate Scientist in 3M Corporate Research Process Lab\, graduated from the University of Minnesota with a BS in Chemical Engineering\, and has 41 years of polymer product development experience at 3M Company. His expertise\, and innovations\, in polymer properties and polymer processing has earned him 85 issued US patents and >60 pending patent applications covering novel optical polymers\, optical film designs\, polymer films with improved properties\, and novel applications of polymer films. Polymer films produced by his inventions have enabled significant 3M polymeric film sales resulting in 6 Golden Step Awards for individual products achieving sales greater than $20million/year. While at 3M Company\, Tim’s technical contributions to 3M have been recognized with 11 Circle of Technical Excellence awards. He has collaborated with many Universities and National Laboratories resulting in 12 research publications including a book chapter on Durable Polymer Films. He is passionate about energy efficiency and sustainability.
URL:https://www.quantumx.washington.edu/calendar/mse-seminar-timothy-hebrink/
CATEGORIES:Materials Science & Engineering
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