论文标题
通过射击噪声对电子状态的空间和能量分辨率
Spatial and energy resolution of electronic states by shot noise
论文作者
论文摘要
射击噪声测量值广泛用于表征电子导体中非平衡构型。最近引入的量子断层扫描方法是针对基于高质量GAAS二维电子气体的相位弹性弹道导体中周期性脉冲脉冲产生的少量电子刺激的电子波形的研究。我们仍然依靠噪声中费米相关性的表现，我们集中在具有良好定义能量和随机相的任意激发的电子系统中，对局部能量分布（ED）的局部测量有益于局部的方法。使用偏置的扩散金属线作为测试床，我们证明了这种方法的功能，并从弱耦合的隧道连接处的射击噪声中提取了众所周知的双步。我们的实验为几乎任何导体的通用非平衡配置的局部测量铺平了道路。
Shot noise measurements are widely used for the characterization of nonequilibrium configurations in electronic conductors. The recently introduced quantum tomography approach was implemented for the studies of electronic wavefunctions of few-electron excitations created by periodic voltage pulses in phase-coherent ballistic conductors based on the high-quality GaAs two-dimensional electron gas. Still relying on the manifestation of Fermi correlations in noise, we focus on the simpler and more general approach beneficial for the local measurements of energy distribution (ED) in electronic systems with arbitrary excitations with well-defined energies and random phases. Using biased diffusive metallic wire as a testbed, we demonstrate the power of this approach and extract the well-known double-step ED from the shot noise of a weakly coupled tunnel junction. Our experiment paves the way for the local measurements of generic nonequilibrium configurations applicable to virtually any conductor.
