Many-body Expedition from Semiconductors to Atomic BECs
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Abstract
I will present a case for manybodypedia, a learning process of many-body physics that finds synergic connections between seemingly different systems. Specifically, I will overview how methods of semiconductor quantum optics relate to phenomena in strongly interacting Bose gas. This expedition focuses on the first unitary BEC experiment [P. Makotyn, et al., Nat. Phys. 10, 116 (2014)] which demonstrated that a surprisingly large BEC fraction survived a quench from weak to unitary interactions where the scattering length diverges. I will show that introducing an excitation picture identifies how a quench creates noncondensed atoms in a strict sequential order where large atom clusters only emerge from existing smaller ones. This observation yields an efficient nonperturbative many-body description of unitary BECs, based on a kinetic cluster-expansion approach developed originally for semiconductor quantum optics. I will discuss how this method quantitatively explains the first unitarity BEC measurement, and how it can be extended to explore, e.g., Efimov physics, universality, and entanglement in one or many strongly interacting BECs.
Bio
Professor Kira develops systematic many-body and quantum-optics approaches to quantitatively analyze, guide, and explain contemporary experiments that study phenomena encountered in the broad field of quantum sciences. His typical research effort involves extensive collaborations with experimentalists to rigorously test quantum concepts and designs. As few demonstrations, his team has recently discovered dropletons, a quasiparticle accelerator, quantum-memory effects, quantum interferences in high-harmonic generation, and explained quantum depletion in strongly interacting Bose-Einstein condensates.
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Physics, Room 242, Purdue University, West Lafayette, IN