Scaling of the Fermi‐Edge Singularity in Quantum Dots

Abstract

The transport characteristics of resonant tunneling through self-assembled InAs quantum dots is explored. Changing the tunneling direction of the electrons leads to major differences in their behavior. By analyzing magnetotransport and shot noise measurements, this effect can be ascribed to different dimensionalities in the leads. In particular we are interested in the Fermi-edge singularity, which is studied by its noise and temperature behavior.

Charge transfer statistics and qubit dynamics at the tunneling Fermi-edge singularity

“…Therefore, in this work we have studied more relevant electron transport characteristics to the modern experiments including Fano factor of the second [10] and third (skewness) orders [18,19]. In particular, we have clarified a possible mechanism leading to appearance of the sub-Poisson and super Poisson shot noise of the tunneling current as it has been observed in the recent experiments [15,16] in the FES regime.…”

“…Although a direct observation of these oscillations would give the most clear verification of the nature of the I-V threshold peaks, it involves measurement of the time dependent transient current averaged over its quantum fluctuations, which is a challenging experimental task. In the recent experiments [10,15,16] the low-temperature short noise measurements have been carried out for this purpose. These measurements showed existence of the sub and super Poisson statistics of the current fluctuations at the FES and have raised [10,15] a new interest [17] in the qubit dynamics, though their coherency manifestation in the current fluctuations needs to be further clarified.…”