We present an electronic transport experiment in graphene where both classical and quantum mechanical charge detector back-action on a quantum dot are investigated. The device consists of two stacked graphene quantum dots separated by a thin layer of boron nitride. This device is fabricated by van der Waals stacking and is equipped with separate source and drain contacts to both dots. By applying a finite bias to one quantum dot, a current is induced in the other unbiased dot. We present an explanation of the observed measurement-induced current based on strong capacitive coupling and energy dependent tunneling barriers, breaking the spatial symmetry in the unbiased system. This is a special feature of graphene-based quantum devices. The experimental observation of transport in classically forbidden regimes is understood by considering higher order quantum mechanical back-action mechanisms.
@article{arxiv.1602.08603,
title = {Measurement back-action in stacked graphene quantum dots},
author = {Dominik Bischoff and Marius Eich and Oded Zilberberg and Clemens Rössler and Thomas Ihn and Klaus Ensslin},
journal= {arXiv preprint arXiv:1602.08603},
year = {2016}
}