主讲人单位 (Speaker's Institute): 西南交通大学物理科学与技术学院

邀请人 (Invited by): 柯勇贯

时间 (Time): 星期三，2022/09/28-20：00-22：00

地点 (Location): 珠海校区天琴中心2317会议室/腾讯会议

摘要 (Abstract): 

We investigate the single-photon scattering spectra of a giant atom coupled to a one-dimensional waveguide via multiple connection points or a continuous coupling region. Using a full quantum mechanical method, we obtain the general analytic expressions for the single-photon scattering coefficients, which are valid in both the Markovian and the non-Markovian regimes. We summarize the influences of the nondipole effects, mainly caused by the phases accumulated by photons traveling between coupling points, on the scattering spectra. We find that under the Markovian limit, the phase decay is detuning independent, resulting in Lorentzian line shapes characterized by the Lamb shifts and the effective decay rates, while in the non-Markovian regime, the accumulated phases become detuning dependent, giving rise to non-Lorentzian line shapes, characterized by multiple side peaks and total transmission points. Another interesting phenomenon in the non-Markovian regime is the generation of a broad photonic band gap by a single giant atom. We further generalize the case of discrete coupling points to the continuum limit with atom coupling to the waveguide via a continuous area, and analyze the scattering spectra for some typical distributions of coupling strength.

主讲人简介 (Speaker's CV): 

蔡邱远，西南交通大学物理学院电子信息科学与技术学士，物理学在读博士（硕博连读）。已在PRA上发表文章一篇。主要研究方向为：波导量子电动力学