Archive ouverte UNIGE | last documents for author 'Andréw Mccallum Martin'https://archive-ouverte.unige.ch/Latest objects deposited in the Archive ouverte UNIGE for author 'Andréw Mccallum Martin'engCharge fluctuations in the edge states of normal-superconducting hybrid nano-structureshttps://archive-ouverte.unige.ch/unige:4233https://archive-ouverte.unige.ch/unige:4233In this work we show how to calculate the equilibrium and non-equilibrium charge fluctuations in a gated normal mesoscopic conductor which is attached to one normal lead and one superconducting lead. We then consider an example where the structure is placed in a high magnetic field, such that the transport is dominated by edge states. We calculate the equilibrium and non-equilibrium charge fluctuations in the gate, for a single edge state, comparing our results to those for the same system, but with two normal leads. We then consider the specific example of a quantum point contact and calculate the charge fluctuations in the gate for more than one edge state.Mon, 30 Nov 2009 16:07:43 +0100Charge fluctuations in a quantum point contact attached to a superconducting leadhttps://archive-ouverte.unige.ch/unige:4227https://archive-ouverte.unige.ch/unige:4227We show how to calculate the charge noise spectrum in a normal mesoscopic conductor, which is capacitively coupled to a macroscopic gate, when this conductor is attached to L normal leads and M superconducting leads, the only restriction being that the superconducting leads must be at the same chemical potential. We then proceed to examine results for a quantum point contact (QPC) in a normal lead connecting to a superconductor. Of interest is the fluctuating current in a gate capacitively coupled to a QPC. The results are compared with the case when all leads are normal. We find a doubling of the equilibrium charge fluctuations and a large enhancement (>2) in the current noise spectrum to first order in \|eV\|, when a channel in the QPC is opening.Mon, 30 Nov 2009 16:07:37 +0100