论文标题
巨型原子波导系统超出偶极子近似的相干单光子散射光谱
Coherent single-photon scattering spectra for a giant-atom waveguide-QED system beyond dipole approximation
论文作者
论文摘要
我们通过多个连接点或连续耦合区域研究了巨型原子的单光子散射光谱。使用完整的量子机械方法，我们获得了单光子散射系数的一般分析表达式，这些表达式在马尔可夫和非阿科维亚方案中都是有效的。我们总结了非偶极效应的影响，这主要是由偶联点之间在散射光谱上传播的光子积累的相引起的。我们发现，在马尔可夫的极限下，相位衰减是不依赖的，导致洛伦兹线的特征在于羔羊的移位和有效的衰减速率。而在非马克维亚方案中，累积的相位依赖性依赖性，从而引起了非Lorentzian线形，其特征是多个侧峰和总传输点。非马克维亚政权中的另一个有趣现象是单个巨型原子产生宽光子带隙。我们将离散耦合点的情况进一步概括为连续限制，而原子耦合通过连续区域耦合到波导，并分析散射光谱的某些典型耦合强度的分布。
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-arkovian regimes. We summarize the influences of the non-dipole 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 lineshapes 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 lineshapes, characterized by multiple side peaks and total transmission points. Another interesting phenomenon in the non-Markovian regime is generation of 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.
