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        "date_start":"2026-03-09",
        "date_end":"2026-03-09",
        "time_start":"16:00:00",
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        "time_zone":"America\/Detroit",
        "event_title":"GLNT: Eigenvarieties over CM fields and Galois representations",
        "occurrence_title":"",
        "combined_title":"GLNT: Eigenvarieties over CM fields and Galois representations: Vaughan McDonald (Stanford)",
        "event_subtitle":"Vaughan McDonald (Stanford)",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"Eigenvarieties are parameter spaces for certain p-adic automorphic forms of varying weight. These objects have become increasingly popular for studying the Fontaine\u2014Mazur conjecture, which leads us to ask what kinds of Galois representations appear on eigenvarieties. Our main result shows that for eigenvarieties for the group GL_n over a CM field, the associated Galois representations are trianguline at all p-adic places, resolving a conjecture of Hansen (following Kisin, Colmez, Bellaiche\u2014Chenevier). The strategy of proof (which could be of independent interest) is to embed eigenvarieties for GL_n into an eigenvariety for a 2n-variable unitary group.",
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        "tags":["Mathematics"],
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                "group_name":"Group, Lie and Number Theory Seminar - Department of Mathematics",
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    {
        "datetime_modified":"20260302T150514",
        "datetime_start":"20260309T160000",
        "datetime_end":"20260309T171500",
        "has_end_time":1,
        "date_start":"2026-03-09",
        "date_end":"2026-03-09",
        "time_start":"16:00:00",
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        "time_zone":"America\/Detroit",
        "event_title":"Gomberg Lecture with Xiaoyang Zhu \"Exciton Sensing of Correlated Electrons, Spins, and Dipoles\"",
        "occurrence_title":"",
        "combined_title":"Gomberg Lecture with Xiaoyang Zhu \"Exciton Sensing of Correlated Electrons, Spins, and Dipoles\": Xiaoyang Zhu (Columbia University)",
        "event_subtitle":"Xiaoyang Zhu (Columbia University)",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"Correlation plays a central role in emergent phenomena, such as quantum ground states and collective excitations. Here, I will discuss what we can learn from time-domain sensing of correlation in two dimensional (2D) van der Waals (vdW) semiconductors, where excitonic transitions are intimately related to bandgap modulation, effectively dielectric constant, and Pauli repulsion. In the 2D vdW magnetic semiconductor, CrSBr, excitonic transition is found to strongly couple to magnetic order and this allows the easy detection of low energy (GHz-THz) magnons by visible-NIR light. In the 2D vdW magnetic semiconductor, NbOI2, we report the experimental discovery of a quasi-particle, the ferron, which may form the basis for new modes of information processing and control. In twisted bilayer MoTe2, we demonstrate exciton sensing as hitherto the most sensitive probe of electron correlation in moir\u00e9 quantum matter, including signatures for a coveted quantum phase - the fractional topological insulator.",
        "occurrence_notes":null,
                "guid":"138388-21882887@events.umich.edu",
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        "building_name":"Chemistry Dow Lab",
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        "tags":["Chemistry"],
        "website":"https:\/\/www.chem.columbia.edu\/content\/xiaoyang-zhu",
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                "group_name":"Department of Chemistry",
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                "website":"https:\/\/lsa.umich.edu\/chem"                }                    ],
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