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DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20260920T131702
DTSTART;TZID=America/Detroit:20261002T150000
DTEND;TZID=America/Detroit:20261002T160000
SUMMARY:Lecture / Discussion:AIM Seminar:  Math and physics at the moiré scale
DESCRIPTION:Abstract: Placing a two-dimensional lattice with a small rotation gives rise to almost periodic \"moiré\" patterns on a superlattice scale much larger than the original lattice. We have used the mathematical techniques developed to study waves in inhomogeneous media to identify a regime where the Bistritzer-MacDonald continuum model emerges as the effective dynamics for electrons modeled as wave-packets spectrally concentrated at the monolayer Dirac points of linear dispersion\, up to error that we rigorously estimate. We have shown that this regime is realized in twisted bilayer graphene at the first \"magic\" angle where the group velocity of the wave packet is zero and strongly correlated electronic phases (superconductivity\, Mott insulators\, etc.) have recently been observed.\n\nWe will present recent results that rigorously extend this analysis to account for the effects of structural relaxation and to essentially arbitrary moiré materials such as twisted multilayer transition metal dichalcogenides (TMDs) or even twisted heterostructures consisting of layers of distinct 2D materials.\n\nContact: Ian Tobasco
UID:148876-21905038@events.umich.edu
URL:https://events.umich.edu/event/148876
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics,Applied Mathematics
LOCATION:East Hall - 1084
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20260914T092752
DTSTART;TZID=America/Detroit:20261002T150000
DTEND;TZID=America/Detroit:20261002T160000
SUMMARY:Workshop / Seminar:Combinatorial invariance for the coefficient of q in Kazhdan-Lusztig polynomials
DESCRIPTION:I will describe joint work with Grant Barkley and Thomas Lam in which we study the Combinatorial Invariance Conjecture (CIC)\, which asserts that Kazhdan-Lusztig polynomials depend only on the combinatorics of Bruhat order. Motivated by the cluster structure on Richardson varieties\, we prove the combinatorial invariance of the coefficient of q in KL polynomials for arbitrary Coxeter groups. We also prove the Gabber-Joseph conjecture for the second-highest Ext group of a pair of Verma modules\, as well as the combinatorial invariance of the dimension of this group.
UID:149734-21907011@events.umich.edu
URL:https://events.umich.edu/event/149734
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 4088
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20260925T182133
DTSTART;TZID=America/Detroit:20261002T150000
DTEND;TZID=America/Detroit:20261002T163000
SUMMARY:Workshop / Seminar:Financial Education Workshop Series
DESCRIPTION:New to the U.S. or just want to feel more confident managing finances here? Join Dr. Heather Moore with Financial Education for a friendly workshop series designed for all - whether you’re learning the basics or looking to build on existing knowledge\, Heather will provide the info you need. This event is the kick-off of a series of three workshops:Friday\, September 18: Navigating University Finances & U.S. Banking Basics | Understand your student account\, financial aid options for international students\, Student Financial Services\, late fees\, scam prevention\, and the basics of U.S. banking.Friday\, October 2: Budgeting\, Living Costs & Financial Planning | Learn how to estimate monthly expenses\, create a realistic student budget\, and plan for the cost of living in the U.S.Friday\, October 16: Credit\, Taxes & Building Long-Term Financial Success | Explore how credit works in the U.S.\, how to build credit safely\, avoid costly debt\, understand credit card interest\, and prepare for tax filing responsibilities.Refreshments provided! Bring your questions - there will be time for Q&A.
UID:152807-21914542@events.umich.edu
URL:https://events.umich.edu/event/152807
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Sessions
LOCATION:Tappan Room, Michigan Union (2nd Floor)
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20260922T153441
DTSTART;TZID=America/Detroit:20261002T150000
DTEND;TZID=America/Detroit:20261002T160000
SUMMARY:Lecture / Discussion:HET Seminar | Out-of-time-ordered Correlators in de Sitter Revisited
DESCRIPTION:We study the 4-point out-of-time-ordered correlator (OTOC) of scalar fields using the eikonal approximation to gravity around a de Sitter background. We consider de Sitter space in any dimension and any bulk masses of the scalar fields. At tree level we find the maximal Lyapunov exponent of  2 \pi/\beta_{dS}. However\, we describe an IR problem in this calculation at the loop level associated with the vector part of the graviton propagator. Regularizing this divergence leads to the vanishing of all odd powers in Newton's constant in the asymptotic expansion\, so that the leading answer comes with twice the maximal Lyapunov exponent in simple operator configurations. We find that the perturbative OTOC in de Sitter can initially grow\, which is not allowed by the quantum bound on chaos. Interestingly\, we find that this growth is mediated by large diffeomorphisms in the graviton propagator.
UID:151680-21911942@events.umich.edu
URL:https://events.umich.edu/event/151680
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Talk,Physics,Lecture,High Energy Theory Seminar,Seminar,Science
LOCATION:Randall Laboratory - 4404
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20260915T103633
DTSTART;TZID=America/Detroit:20261002T150000
DTEND;TZID=America/Detroit:20261002T160000
SUMMARY:Lecture / Discussion:High-Speed Back Emitting VCSEL for AI Scale-up Optical Interconnects
DESCRIPTION:Abstract \n\nHigh bandwidth-density and energy-efficient optical links are required to interconnect accelerators\, memory\, and switches in AI scale-up systems. Back-emitting (BE) vertical-cavity surface-emitting laser (VCSEL) are promising for this application because of its two-dimensional (2D) topology facilitating large array\, simultaneous operation using flip-chip addressable architecture. The wavelength of interests ranges from 940- to 1060-nm wavelength regime. In this talk\, we review BE-VCSEL at both wavelengths\, showing their suitability for high-speed multi-mode fiber (MMF) transmission. For the 940-nm BE-VCSEL with a monolithically integrated high-contrast- metalens (HCM) at the back of the substrate to enable high efficiency MMF coupling with a large tolerance. A 106-Gb/s PAM4 link over 30-m OM2 fiber operates below the KP4-FEC threshold was obtained. The 940-nm flip-chip device exhibits an approximately 40-K lower junction temperature than a reference 850-nm top-emitting VCSEL at 9 mA\, supports an open 106-Gb/s PAM4 eye at 110 °C\, and achieves error-free 25-Gb/s NRZ transmission at 140 °C. A 16-channel near-package-optics transmitter provides clear 106-Gb/s PAM4 eyes across all channels\, corresponding to an aggregate capacity of approximately 1.6 Tb/s. For the 1060-nm BE-VCSEL\, we show a 3-dB modulation bandwidth of 43.97-GHz at 7 mA\, limited by instrumentation. The device has a low 0.4-mA threshold current and intensity noise of -149.6 dB/Hz at 7 mA. It further supports 212-Gb/s PAM4 transmission over 30-m OM2 and 50-m OM5 fibers under the stated transmitter and receiver equalization conditions. We believe these results attest to BE-VCSEL array for high-lane-rate\, two-dimensionally scalable optical engines for cost-effective AI scale-up interconnects through conventional MMF over a wide wavelength range between 940~1060 nm.\n\nBio\n\nConnie Chang-Hasnain is Chairperson of Berxel Photonics Co. Ltd. and X.Q. Deng Presidential Chair Professor at the Chinese University of Hong Kong (Shenzhen). Dr. Chang-Hasnain received her Ph.D. in Electrical Engineering and Computer Science (EECS) from UC Berkeley in 1987. She was a Member of the Technical Staff at Bell Communications Research (1987–1992) and Assistant Professor at Stanford University (1992–1995). She joined UC Berkeley as Professor of EECS in 1996. She was Whinnery Distinguished Chair Professor since 2006\; Chair of the Nanoscale Science and Engineering Graduate Group 2006-2017\; and Associate Dean for Strategic Alliances of College of Engineering 2014-2019. She retired from UC Berkeley and is Whinnery Chair Professor Emerita since 2020.\n\nProf. Chang-Hasnain’s research interests range from semiconductor optoelectronic devices to materials and applications. Over the past 40 years\, she worked on many aspects of VCSELs including planar VCSEL structure\, MEMS-VCSEL for wavelength tuning\, and VCSEL arrays for 3D imaging. She has been honoured with the 2024 IEEE Nick Holonyak Jr. Medal\, 2018 Okawa Prize\, 2015 UNESCO Medal For the Development of Nanoscience and Nanotechnologies\, and 2011 IEEE David Sarnoff Award. She was the Editor-in-Chief of Journal of Lightwave Technology 2007-2012\, a member of IEEE LEOS Board of Governors\, OSA Board of Directors\, and the 2021 President of Optica. She is member of the US National Academy of Engineering.
UID:152186-21913186@events.umich.edu
URL:https://events.umich.edu/event/152186
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Electrical And Computer Engineering,Computer Engineering,Electrical Engineering and Computer Science,engineering
LOCATION:Electrical Engineering and Computer Science Building - 1311 EECS
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20260925T180409
DTSTART;TZID=America/Detroit:20261002T150000
DTEND;TZID=America/Detroit:20261002T235959
SUMMARY:Other:Katie Johanni Memorial Tournament @ OSU
DESCRIPTION:WCWP will be traveling to Columbus to compete in the Katie Johanni Memorial Tournament hosted by the Ohio State Women's Club Water Polo Team. The event is 10/2-10/4.
UID:152228-21913402@events.umich.edu
URL:https://events.umich.edu/event/152228
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:
LOCATION:Mccorkle Aquatic Pavilion
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20260828T082708
DTSTART;TZID=America/Detroit:20261002T150000
DTEND;TZID=America/Detroit:20261002T160000
SUMMARY:Reception / Open House:LSA Campus Tours for Transfer Students
DESCRIPTION:Join the LSA Transfer Student Ambassadors for a central campus tour and to learn all about the transfer student experience. As transfer students\, the Ambassadors understand the questions you have and designed a tour with the needs of transfer students in mind.\n\nPlease register using the link to the right.
UID:95236-21910835@events.umich.edu
URL:https://events.umich.edu/event/95236
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Transfer Student Center,transfer,Transfer Students
LOCATION:LSA Building - 1180 (Transfer Student Center)
CONTACT:
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