Rokhinson L P, Guo L J, Chou S Y, Tsui D C, Eisenberg E, Berkovits R, Altshuler B L
Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA.
Phys Rev Lett. 2002 May 6;88(18):186801. doi: 10.1103/PhysRevLett.88.186801. Epub 2002 Apr 18.
We show that the coherence of charge transfer through a weakly coupled double-dot dimer can be determined by analyzing the statistics of the conductance pattern, and does not require a large phase coherence length in the host material. We present an experimental study of the charge transport through a small Si nanostructure, which contains two quantum dots. The transport through the dimer is shown to be coherent. At the same time, one of the dots is strongly coupled to the leads, and the overall transport is dominated by inelastic cotunneling processes.
