报告题目：Two-body scattering in a unitary gas: anomalous phase shifts and dimers

报 告 人：Junliang Song, Institute of Quantum Optics and Quantum Information of Austrian Academy of Sciences, Innsbruck, Austria

报告时间：9月16日下午3:00

报告地点：科学馆322报告厅

报告摘要：Few-body scattering plays an important role in the low energy properties of quantum gases. In a many-body system, two-body scattering properties can be significantly modified by the medium. We show that in a unitary gas of Fermi-Fermi mixtures, anomalous scattering phase shifts and quasi-dimers with negative masses can appear, as a result of Pauli blocking. We also apply these results to study the lifetime of quasi-particles and dimers at resonances.