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DTSTART;TZID=America/Los_Angeles:20260413T143000
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DTSTAMP:20260525T124354
CREATED:20251212T232721Z
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UID:7832-1776090600-1776094200@www.quantumx.washington.edu
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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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20260420T143000
DTEND;TZID=America/Los_Angeles:20260420T152000
DTSTAMP:20260525T124354
CREATED:20251212T232734Z
LAST-MODIFIED:20260419T230039Z
UID:7833-1776695400-1776698400@www.quantumx.washington.edu
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
END:VEVENT
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DTSTART;TZID=America/Los_Angeles:20260504T143000
DTEND;TZID=America/Los_Angeles:20260504T152000
DTSTAMP:20260525T124354
CREATED:20251212T232748Z
LAST-MODIFIED:20260504T083025Z
UID:7834-1777905000-1777908000@www.quantumx.washington.edu
SUMMARY:MSE Seminar: Chenhao Jin
DESCRIPTION:Event interval: Single day eventAccessibility Contact: Matthew Yankowitz\, myank@uw.eduEvent Types: Lectures/Seminars \nTitle: Probing emergent excitations in semiconducting moiré superlattices \nAbstract: Semiconducting moiré superlattices recently emerged as an attractive platform for engineering new quantum phenomena. While a plethora of intriguing ground states are reported\, their dynamics and excitations remain largely unexplored\, which govern their responses to intrinsic fluctuations and external driving. In this talk\, I will discuss our recent efforts to investigate excitations in semiconducting moiré superlattices. Using an ultrafast wide-field imaging technique\, we record their complete space-time evolution\, such as space-and-time-resolved transport. This allows us to simultaneously capture and separate multiple collective excitations\, identify their nature and distinguish them from single-particle ones\, which have been challenging from steady-state measurements. These emergent excitations govern dynamic responses of the system and play a central role in phase stability and transition. Our results highlight new insights encoded in collective excitations and open avenues for studying and engineering correlated quantum systems through nonequilibrium approaches. \nBio: Dr. Chenhao Jin is an assistant professor of Physics at UC Santa Barbara. He received a B.S. in Physics from Peking university and PhD in Physics from UC Berkeley. He was a Kavli fellow at Cornell University between before moving to UC Santa Barbara in 2021. Dr. Jin’s research focuses on developing new optical spectroscopy and imaging techniques to "watch" quantum phenomena in space and time; and has made seminal contributions to optical studies of van der Waals materials and moiré superlattices. Dr. Jin has received multiple awards\, including AFOSR YIP award\, NSF CAREER award\, Blavatnik Regional Awards for Young Scientists\, and Sloan Research Fellowship.
URL:https://www.quantumx.washington.edu/calendar/mse-seminar-chenhao-jin/
CATEGORIES:Materials Science & Engineering
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20260511T143000
DTEND;TZID=America/Los_Angeles:20260511T152000
DTSTAMP:20260525T124354
CREATED:20251212T232759Z
LAST-MODIFIED:20260511T090032Z
UID:7835-1778509800-1778512800@www.quantumx.washington.edu
SUMMARY:MSE Seminar: Mit Naik
DESCRIPTION:Event interval: Single day eventCampus room: SIG 134Accessibility Contact: Matthew Yankowitz\, myank@uw.eduEvent Types: Lectures/Seminars \nTitle: Emergence of Moiré Excitons and Taco-Shaped Flat Bands in Twisted Transition Metal Dichalcogenides. \nAbstract: Moiré patterns of 2D van der Waals materials have proven to be an ideal platform to host unusual correlated electronic phases\, emerging magnetism\, and novel exciton physics. In this talk\, I will present state-of-the-art first-principles calculations revealing how structural reconstruction\, flat electronic bands\, and moiré localization collectively shape excitonic states in twisted transition metal dichalcogenide (TMD) heterostructures. These calculations uncover distinct excitonic states with different spatial and optical characteristics and provide microscopic design principles for tailoring excitonic properties in moiré materials. Our predictions have been validated through close collaborations with experiments including reflection contrast spectroscopy\, electron energy-loss spectroscopy\, and scanning tunneling spectroscopy.  Moiré physics in large twist angles have received relatively less attention since the K valley states are largely decoupled between layers at such angles and the superlattice exhibits minimal structural reconstruction. I will discuss our surprising discovery of a new kind of valley system in bilayer transition metal dichalcogenides twisted to a large magic angle\, where interlayer hybridization between like-spin Λ valleys generates extended\, spin-polarized flat bands with quasi-one-dimensional dispersion. These “taco"-shaped valleys form six anisotropic channels that interconnect across the moiré Brillouin zone\, exhibiting alternating spin polarization under sixfold rotation\, reminiscent of altermagnetic textures. The flat band shows a power-law divergent density of states due to its quasi-one-dimensional character\, enhancing the potential for correlated phases. A direct consequence of this flat band observed recently is the emergence of phonon-assisted intervalley absorption peaks in reflection contrast spectra measurements. \nBio: Mit Naik is an assistant professor in the physics department at the University of Texas at Austin working in the field of computational condensed matter physics and material science. His research particularly targets electronic and optical excitations in nanostructured quantum materials studied using first-principles electronic-structure calculations. He obtained his Ph.D. in physics at the Indian Institute of Science\, Bangalore\, and held a postdoctoral position at the University of California\, Berkeley.
URL:https://www.quantumx.washington.edu/calendar/mse-seminar-tbd-7/
CATEGORIES:Materials Science & Engineering
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20260518T143000
DTEND;TZID=America/Los_Angeles:20260518T152000
DTSTAMP:20260525T124354
CREATED:20251212T223217Z
LAST-MODIFIED:20260518T091526Z
UID:7836-1779114600-1779117600@www.quantumx.washington.edu
SUMMARY:MSE Seminar: Kayla Sprenger
DESCRIPTION:Event interval: Single day eventAccessibility Contact: Matthew Yankowitz\, myank@uw.eduEvent Types: Lectures/Seminars \nTitle: Engineering Polymer Interfaces via Multiscale Modeling Across Sustainability and Health. \nAbstract: Plastic waste\, materials sustainability\, and biomaterial performance represent interconnected challenges that require molecular-level understanding across a wide range of polymer systems. In the Rationally Designed Immunotherapeutics and Interfaces (RDI) Lab\, we leverage multiscale computational approaches to interrogate and engineer polymer interfaces spanning applications across sustainability and health. Central to our work is the idea that molecular interactions at polymer interfaces govern macroscopic properties including degradation behavior\, catalytic reactivity\, material performance\, and biological response. This seminar will highlight how advanced in silico approaches\, including reactive molecular dynamics simulations and enhanced sampling methods\, can provide molecular-scale insight into complex polymer systems relevant to the plastics circular economy and next-generation biomaterials. First\, I will discuss our work investigating polymer/metal oxide interfaces relevant to catalytic plastics upcycling and hydrogenolysis\, with the goal of understanding how interfacial chemistry influences degradation pathways and catalytic reactivity for mixed plastic waste streams. I will then describe our efforts to investigate polymer/enzyme interfaces governing PET biodegradation\, including computational identification of mutations that may improve PET-degrading enzyme activity and stability. \nBeyond improving strategies for degrading existing plastics\, our lab is also focused on designing sustainable materials from the ground up. Accordingly\, a major focus of the talk will center on our investigations of biomatter-derived bioplastics composed of biologically derived components including proteins\, carbohydrates\, lipids\, and polymers. By integrating molecular simulations with collaborators’ experimental thermomechanical processing and spectroscopy data\, we seek to uncover how molecular composition and intermolecular interactions influence the emergent structure and properties of these sustainable materials. Finally\, I will briefly discuss how many of the same computational frameworks developed for sustainable polymer systems can be extended to biomedical polymer interfaces\, including polymer-protein bioconjugates and polymer-based coatings designed to stabilize proteins and mitigate inflammatory foreign body responses to implanted biomaterials. Collectively\, these studies showcase how multiscale modeling can accelerate rational engineering of polymer interfaces across applications spanning plastics circularity\, sustainable materials\, and health. \nBio: Kayla G. Sprenger\, Ph.D.\, is an Assistant Professor in the Chemical and Biological Engineering Department at the University of Colorado Boulder. Dr. Sprenger received her Ph.D. in Chemical Engineering in 2017 from the University of Washington-Seattle with Dr. Jim Pfaendtner. Her Ph.D. was focused on the development and use of molecular simulation tools to study the structure and function of biomolecules at interfaces. She completed her postdoctoral studies in 2020 at MIT in the Institute for Medical Engineering & Science with Dr. Arup Chakraborty\, developing agent-based models of stochastic biological processes. Her lab at CU Boulder is now focused on utilizing multiscale computational approaches to understand and engineer interfaces for broad applications ranging from sustainable energy to health and medicine.
URL:https://www.quantumx.washington.edu/calendar/mse-seminar-robert-hickey/
CATEGORIES:Materials Science & Engineering
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20260601T143000
DTEND;TZID=America/Los_Angeles:20260601T152000
DTSTAMP:20260525T124354
CREATED:20251212T223137Z
LAST-MODIFIED:20260525T100025Z
UID:7837-1780324200-1780327200@www.quantumx.washington.edu
SUMMARY:MSE Seminar: Joe Falson
DESCRIPTION:Event interval: Single day eventAccessibility Contact: Matthew Yankowitz\, myank@uw.eduEvent Types: Lectures/Seminars \nTitle: TBD \nAbstract: TBD \nBio: TBD
URL:https://www.quantumx.washington.edu/calendar/mse-seminar-joe-falson/
CATEGORIES:Materials Science & Engineering
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