Probing charge- and heat-current noise by frequency-dependent fluctuations in temperature and potential
Artikel i vetenskaplig tidskrift, 2018

The energetic properties of electron transport in mesoscopic and nanoscale conductors are of considerable interest at present. Here, we theoretically investigate the possibility of probing charge- and heat-current fluctuations as well as their mixed correlations via the temperature and electrochemical potential fluctuations of a probe coupled to the conductor. Our particular interest is devoted to the charge and energy noise stemming from time-dependently-driven nanoelectronic systems designed for the controlled emission of single electrons, even though our setup is appropriate for more general ac-driving schemes. We employ a Boltzmann-Langevin approach in order to relate the bare charge- and energy-current fluctuations emitted from the electron source to frequency-dependent electrochemical potential and temperature fluctuations, which the former induce in the probe. We apply our findings to the prominent example of an on-demand single-electron source, realized by a driven mesoscopic capacitor in the quantum Hall regime. We show that neither the background fluctuations of the probe in the absence of the working source, nor the fluctuations induced by the probe hinder the access to the sought-after direct source noise for a large range of parameters.

time-dependently driven mesoscopic capacitor

energy and heat currents

charge current

fluctuations and noise

single-electron source

Boltzmann-Langevin approach.

Floquet scattering theory

Författare

Nastaran Dashti

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Maciej Misiorny

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Uniwersytet im. Adama Mickiewicza w Poznaniu

Peter Samuelsson

Lunds universitet

Janine Splettstoesser

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Physical Review Applied

2331-7019 (eISSN)

Vol. 10 2 024007-1-024007-18

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Fysik

Nanoteknik

DOI

10.1103/PhysRevApplied.10.024007

Mer information

Senast uppdaterat

2018-08-30