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DTSTAMP:20260817T144314
DTSTART;TZID=America/Detroit:20260911T150000
DTEND;TZID=America/Detroit:20260911T160000
SUMMARY:Presentation:NERS Colloquium: Departmental Welcome
DESCRIPTION:Xiaodong Sun\, NERS interim chair and professor\, will welcome the NERS community back for the 2026-27 academic year\, sharing departmental updates\, successes\, priorities\, and a look at what’s ahead for NERS.
UID:150328-21909020@events.umich.edu
URL:https://events.umich.edu/event/150328
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Colloquia,Nuclear,Nuclear Engineering and Radiological Sciences,Orientation
LOCATION:Cooley Building - Baer Room (2906 Cooley)
CONTACT:
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DTSTAMP:20260810T205616
DTSTART;TZID=America/Detroit:20260911T150000
DTEND;TZID=America/Detroit:20260911T160000
SUMMARY:Lecture / Discussion:Pseudo-magnetism in a strained discrete honeycomb lattice
DESCRIPTION:Abstract: Slowly-varying nonuniform strain in honeycomb media can generate an effective pseudo-magnetic field\, even though the underlying medium is non-magnetic. This phenomenon was first discovered in graphene and later in photonic crystals\, and other physical settings. In this talk\, I will start from a discrete nearest-neighbor tight-binding model for a nonuniformly strained honeycomb medium. I will then show how this model leads to a continuum magnetic Dirac Hamiltonian that describes wave packets concentrated near a Dirac point of the undeformed structure. I will focus on unidirectional deformations with bounded gradients that preserve translation invariance along the armchair direction. In this setting\, we prove the existence of eigenmodes that behave like plane waves along the armchair direction and are strongly localized in the transverse direction\, together with quantitative correction estimates. These results apply to deformations that produce an approximately constant pseudo-magnetic field perpendicular to the plane. They also lead to nearly flat bands and\, as a consequence\, a very high density of states. These analytical results are also supported by numerical simulations of the corresponding deformations. This is joint work with Michael I. Weinstein.\n\nContact:  Ian Tobasco
UID:148873-21905035@events.umich.edu
URL:https://events.umich.edu/event/148873
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Applied Mathematics,Mathematics
LOCATION:East Hall - 1084
CONTACT:
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