{ "109302-21821367": { "datetime_modified":"20240326T084754", "datetime_start":"20240404T160000", "datetime_end":"20240404T171500", "has_end_time":1, "date_start":"2024-04-04", "date_end":"2024-04-04", "time_start":"16:00:00", "time_end":"17:15:00", "time_zone":"America\/Detroit", "event_title":"Harnessing energy flow in molecules & nanomaterials: A tale of forbidden transitions, molecular motions, and exotic excitations", "occurrence_title":"", "combined_title":"Harnessing energy flow in molecules & nanomaterials: A tale of forbidden transitions, molecular motions, and exotic excitations: Andres Montoya-Castillo (University of Colorado Boulder)", "event_subtitle":"Andres Montoya-Castillo (University of Colorado Boulder)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Spectroscopy has the potential to reveal the structure and dynamics of complex materials, ranging from chromophores in solution to molecular aggregates and nanomaterial heterostructures. Yet, disentangling spectral signals and extracting an intuitive picture of how excitations form, move, and exchange energy is one of the deepest and most persistent challenges of physical chemistry. In this talk, I will offer two vignettes on our work developing and applying approaches to predict and understand spectral features in molecular and nanomaterial systems. In the molecular world, I will show how our recent advances in condensed phase spectroscopy enable us to decipher a long-standing puzzle in porphyrin photophysics: why and how do the Q bands involved in energy transfer in photosynthesis and artificial energy conversion split? In the nanomaterial world, I will highlight how we have been able to demonstrate how the unusual photophysics of atomically thin 2D materials enables hot carrier extraction for photocatalysis. Then, I will illustrate how addressing the challenge of hot carrier extraction enabled us to develop a simple scheme to disentangle the signals of exotic quasiparticles that explain the tunability of the optical behavior of these materials as a function of potential, laser fluence, and time.", "occurrence_notes":null, "guid":"109302-21821367@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/109302", "building_id":"1000158", "building_name":"Chemistry Dow Lab", "campus_maps_id":"34", "room":"1640", "location_name":"Chemistry Dow Lab", "has_livestream":0, "cost":"", "tags":["Chemistry","Physical Chemistry","Science"], "website":"https:\/\/www.colorado.edu\/chemistry\/andres-montoya-castillo", "sponsors":[ { "group_name":"Department of Chemistry", "group_id":"3761", "website":"https:\/\/lsa.umich.edu\/chem" }, { "group_name":"Physical Chemistry", "group_id":"4390", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21821367 } , "120739-21845199": { "datetime_modified":"20240328T071812", "datetime_start":"20240404T160000", "datetime_end":"20240404T170000", "has_end_time":1, "date_start":"2024-04-04", "date_end":"2024-04-04", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Interdisciplinary QC-CM Seminar | Bridging Hubbard and quantum Hall physics in twisted bilayer graphene", "occurrence_title":"", "combined_title":"Interdisciplinary QC-CM Seminar | Bridging Hubbard and quantum Hall physics in twisted bilayer graphene: Eslam Khalaf (Harvard University)", "event_subtitle":"Eslam Khalaf (Harvard University)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Early on it was noticed that twisted bilayer graphene has elements in common with two paradigmatic examples of strongly correlated physics: Hubbard physics and quantum Hall physics. Indeed, twisted bilayer graphene hosts flat topological bands, but these bands host concentrated charge density, experimental signs of fluctuating magnetism, and signs of unconventional superconductivity. The emergence of fluctuating moments is particularly surprising, as localized Wannier states do not exist in topological bands. I will discuss a model for the twisted bilayer graphene flat bands that centers the concentration of charge density and, relatedly, the concentration of Berry flux. After establishing good quantitative agreement with more microscopic models, I will show how the model hosts parametrically decoupled flavor moments. These flavor moments are tied to Wannier states that are power-law delocalized, with infinite localization length, that nonetheless have parametrically small overlap with each other. I will conclude by discussing some experimental implications for this picture.", "occurrence_notes":null, "guid":"120739-21845199@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/120739", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"335", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Physics","Science"], "website":"", "sponsors":[ { "group_name":"Interdisciplinary QC\/CM Seminars", "group_id":"3811", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21845199 } , "120630-21845068": { "datetime_modified":"20240322T163421", "datetime_start":"20240404T160000", "datetime_end":"20240404T170000", "has_end_time":1, "date_start":"2024-04-04", "date_end":"2024-04-04", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Online Admitted Student Information Sessions", "occurrence_title":"", "combined_title":"Online Admitted Student Information Sessions: For students admitted for Spring, Summer, and Fall 2024", "event_subtitle":"For students admitted for Spring, Summer, and Fall 2024", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Join the Transfer Student Center staff to learn more about:\r\n1. How to understand your transfer credit and how transfer credit will count for degree requirements.\r\n2. Orientation and registering for your first semester of classes.\r\n3. Connecting with the department that you plan to major in.\r\n4. Your housing options.\r\n5. And, any other questions that you have.\r\n\r\nRegistration is required. Register using the link to the right. 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