Nonequilibrium probing of two-level charge fluctuators using the step response of a single-electron transistor
Artikel i vetenskaplig tidskrift, 2014

We report a new method to study two-level fluctuators (TLFs) by measuring the offset charge induced after applying a sudden step voltage to the gate electrode of a single-electron transistor. The offset charge is measured for more than 20 h for samples made on three different substrates. We find that the offset charge drift follows a logarithmic increase over 4 orders of magnitude in time and that the logarithmic slope increases linearly with the step voltage. The charge drift is independent of temperature, ruling out thermally activated TLFs and demonstrating that the charge fluctuations involve tunneling. These observations are in agreement with expectations for an ensemble of TLFs driven out of equilibrium. From our model, we extract the density of TLFs assuming either a volume density or a surface density.

Författare

Arsalan Pourkabirian

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Martin Gustafsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Göran Johansson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

John Clarke

Chalmers, Mikroteknologi och nanovetenskap (MC2)

Per Delsing

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 113 256801- 256801

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Nanoteknik

Den kondenserade materiens fysik

Infrastruktur

Nanotekniklaboratoriet

DOI

10.1103/PhysRevLett.113.256801