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Condensed Matter Seminar - Naren Manjunath, "What's inside a parameterized family?"

Event Type
Seminar/Symposium
Sponsor
Department of Physics
Location
ESB 190
Date
Feb 17, 2025   4:00 pm  
Speaker
Naren Manjunath, Perimeter Institute
Contact
Thierry Ramais
E-Mail
ramais@illinois.edu
Phone
217-333-2020
Views
21
Originating Calendar
Physics - Condensed Matter Seminar

Abstract: The Thouless charge pump, the Berry-Chern number of a spin in a magnetic field, and their recent generalizations to higher dimensions are important examples of parameterized topological families of gapped ground states. One way to realize such families is by spontaneously breaking a continuous G symmetry down to a subgroup H. The resulting Goldstone modes can carry topological terms, and if we further gap out the Goldstone modes, we get a parameterized family. Our main result is that the possible families are constrained by the anomaly of the original G symmetric state, with the full structure given by a 'compatibility relation'. Separately, I will discuss examples of topological families from classical physics, and their potential usefulness in understanding phase transitions.

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