本文报道光激发导体的\emph{dynamical response of current fluctuations}理论。我们已经进行了计算的相干导体所描述的任意能量依赖的传输和任意频率。我们考虑两个实验设置,对应于不同的方式对称化当前运营商,导致不同的预测。我们的结果是在非常好的,定量协议与最近的测量。我们证明,我们已经计算的噪声的动力学响应的关键概念,涉及动态库仑阻塞,即电子-电子校正的电导由于存在的外部阻抗,量子噪声。
英文摘要:
We report the theory of the \emph{dynamical response of current fluctuations} of a photo-excited conductor. We have performed the calculation for a coherent conductor described by arbitrary energy-dependent transmissions and for arbitrary frequencies. We consider two experimental setups that correspond to different ways of symmetrizing the current operators, leading to different predictions. Our results are in very good, quantitative agreement with a recent measurement. We demonstrate that the dynamical response of noise that we have calculated is the key concept that relates Dynamical Coulomb Blockade, i.e. the electron-electron correction to the conductance due to the presence of an external impedance, to quantum noise.
Motivated by the recent discovery of Dirac nodal line in the single-component molecular conductor [Pt(dmdt)$_{2}$], we propose a three-orbital tight-binding model based on the Wannier fitting of the first-principles calculation, and address the problems of edge states, topological properties and magnetic susceptibility. We find that logarithmic peaks of the local density of states emerge near the Fermi energy, owing to pseudo-one-dimensional edge states that appear between the Dirac nodal lines. Magnetic susceptibility calculated in our model can explain the experimental result at a high tempe…
Photon-assisted electron-hole shot noise in multi-terminal conductors
受L.最近的一项实验的启发,H. Reydellet等人,物理修订版信函90,176803(2003)中,我们讨论了根据电子-空穴对激发的介观多探针导体中的光子辅助散粒噪声的解释。将AC电压施加到样品的触点。有趣的是电子和空穴成对产生的事实所产生的相关性。我们表明,与两个不同的相位交流电位的大小和频率相等,施加到不同的接触,它是可能的跟踪出的Hanbury布朗Twiss交换干涉的相关性在一个四探针导体。计算了四探针单通道混沌点的Hanbury Brown Twiss相位分布。
Emission of Microwave Photon Pairs by a Tunnel Junction
非经典电磁场的产生和控制是量子信息物理中的一个重要问题。虽然用于产生这种场的通常方法依赖于(晶体、约瑟夫森结等的)非线性,最近在正常导体(微波辐射下的隧道结)上进行的实验揭示了一种替代方案:在量子导体\cite{PAN_squeezing}中使用电子散粒噪声。在这里,我们表明,这样的设备可以发射不同频率的\emph{pairs of microwave photons}的速率一样高的超导约瑟夫森结\cite{Flurin}。这导致在光子散粒噪声之下相关的两个不同频率处的光子场的强度波动,即双模振幅压缩。我们的实验是从量子光学的角度理解电子噪声的基本步骤,并表明即使是正常的导体也可以用作量子信息处理的资源。