Events on Thursday, July 10th, 2025
- R. G. Herb Condensed Matter Seminar
- One-dimensional interacting topological phases: a bosonization approach
- Time: 10:00 am
- Place: 5310 Chamberlin
- Speaker: Polina Matveeva, UMN
- Abstract: I will talk about the topological properties of one-dimensional interacting fermionic phases.
In the first part of my talk, I will discuss the properties of fermionic microscopic models built from two coupled Su-Schrieffer-Heeger chains. We showed that such a system realizes all possible Altland-Zirnbauer symmetry classes. I will briefly discuss some general properties of these chain models that do not directly follow from the non-interacting classification table. In particular, we demonstrated that the non-interacting models that belong to Z classes can be adiabatically deformed into one another without changing the topological invariant as long as chiral symmetry is preserved. As a next step, I will discuss the effects of weak interactions on the topological properties of these chain models using bosonization and show that the chiral symmetry protects topology also in the interacting case.
In the second part of my talk, I will switch to a microscopic model of strongly interacting spinful fermions, where the gap is opened due to interactions. I will discuss the non-trivial topological properties of both insulating and metallic phases that emerge at the critical lines between gapped phases. I will discuss how these phases relate to and differ from single-particle topological phases. - Host: Alex Levchenko
- Atomic Physics Seminar
- Microcavity Photonic Interfaces for Neutral Atom Quantum Computing
- Time: 1:00 pm - 2:30 pm
- Place: Chamberlin 5310
- Speaker: Dr. Brandon Grinkemeyer, Harvard University
- Abstract: Neutral atom qubits trapped in optical tweezers are a promising platform for quantum information processing, with control over several hundred qubits already demonstrated. Further scaling could be significantly enhanced by coupling these systems to optical interfaces, enabling quantum networking and fast, non-demolition readout for quantum error correction. In this talk, I will discuss our progress toward developing a photonic interconnect for large-scale neutral atom quantum processors. Specifically, I will present the strong coupling of single atoms to fiber Fabry-Perot cavities and how this interaction can be harnessed for quantum information processing. Additionally, I will introduce novel, scalable fabrication techniques for high-finesse microcavities and ongoing efforts to integrate them with atom arrays.
- Host: Mark Saffman