耦合环形玻色-爱因斯坦凝聚体中angular momentum约瑟夫森振荡的自发出现

Radiative Properties of an Artificial Atom coupled to a Josephson Junction Array

We study the radiative properties -- the Lamb shift, Purcell decay rate and the spontaneous emission dynamics -- of an artificial atom coupled to a long, multimode cavity formed by an array of Josephson junctions. Introducing a tunable coupling element between the atom and the array, we demonstrate that such a system can exhibit a crossover from a perturbative to non-perturbative regime of light-matter interaction as one strengthens the coupling between the atom and the Josephson junction array (JJA). As a consequence, the concept of spontaneous emission as the occupation of the local atomic s…

Collapse in ultracold Bose Josephson junctions

We investigate how ultracold atoms in double well potentials can be used to study and put bounds on models describing wave function collapse. We refer in particular to the continuous spontaneous localization (CSL) model, which is the most well studied among dynamical reduction models. It modifies the Schrodinger equation in order to include the collapse of the wave function in its dynamics. We consider Bose Josephson junctions, where ultracold bosons are trapped in a double well potential,since they can be experimentally controlled with high accuracy and are suited and used to study macroscopi…

自感生玻色子约瑟夫森结中的相位滑移和自陷

Phase-slippage and self-trapping in a self-induced bosonic Josephson junction

当偶极垂直于阱对称轴取向且s波散射长度足够小时，环形阱中的偶极凝聚态构成自感Josepshon结.由平均场偶极相互作用的各向异性特性产生的环形双阱势具有足够的鲁棒性，能够维持自陷动力学，当两个阱之间的初始布居不平衡较大时，自陷动力学就会发生。我们表明，在这个系统中的自陷制度是直接相关的涡诱导的相位滑移动力学。在粒子数不平衡达到最小值之前，低密度区的涡旋和反涡旋会自发地成核，然后沿相反的方向穿过连接处，这种涡旋动力学在两个弱连接的凝聚体之间产生了相位滑移，导致粒子通量的反转。

耦合约瑟夫森结线性阵列中的稳定参量库珀对泵浦

Stabilized parametric Cooper-pair pumping in a linear array of coupled Josephson junctions

我们提出了一个实验上可实现的稳定的电荷泵计划的线性阵列的库珀对盒。系统设计本质上保护泵送机制免受严重错误，特别是电流反转和自发电荷激发。实现量子芝诺效应以进一步减小泵浦误差。该方案的特点是从提高现行标准的角度考虑的。这种改进与所谓的测量三角形的封闭性（见D。Averin [Nature 434，285（2005）]）。

关于约瑟夫森效应的费曼悖论与双结中的锯齿电流

Feynman Paradox about the Josephson effect and a sawtooth current in the double junction

针对费曼约瑟夫森效应模型无法解释实际场景下直流约瑟夫森效应的问题，研究基于BCS理论推导耦合GL方程，揭示非线性耦合的关键作用，并在双结中得到费曼方法无法实现的锯齿电流结果。

Strain-engineered Majorana Zero Energy Modes and ϕ0 Josephson State in Black Phosphorus

We develop a theory for strain control of Majorana zero energy modes and Josephson effect in black phosphorus (BP) devices proximity coupled to a superconductor. Employing realistic values for the band parameters subject to strain, we show that the strain closes the intrinsic band gap of BP, however the proximity effect from the superconductor reopens it and creates Dirac and Weyl nodes. Our results illustrate that Majorana zero energy flat bands connect the nodes within the band-inverted regime in which their associated density of states is localized at the edges of the device. In a ferromagn…

Stable Switching among High-Order Modes in Polariton Condensates

We report multistate optical switching among high-order bouncing-ball modes ("ripples") and whispering-gallerying modes ("petals") of exciton-polariton condensates in a laser-generated annular trap. By tailoring the diameter and power of the annular trap, the polariton condensate can be switched among different trapped modes, accompanied by redistribution of spatial densities and superlinear increase in the emission intensities, implying that polariton condensates in this geometry could be exploited for a multistate switch. A model based on non-Hermitian modes of the generalized Gross-Pitaevsk…

与电磁辐射耦合的马约拉纳费米子

Majorana fermions coupled to electromagnetic radiation

我们考虑两个纳米线之间的电压偏置约瑟夫森结托管马约拉纳零模式发生拓扑保护的零能量激发在结。我们发现，两个马约拉纳费米子本地化的结，即使是中性粒子，与电磁场相互作用，并产生类似于传统的约瑟夫森辐射的相干辐射。在辐射场的半经典分析中，我们发现光学相位被锁定到超导相位差，并且辐射以约瑟夫森频率的一半发射。为了证实辐射的相干性，我们研究了直流电中两个空间分离的结发射的辐射的相关性。SQUID几何考虑到退相干由于自发状态开关以及由于准粒子中毒。