Minimal excitation single-particle emitters: Comparison of charge-transport and energy-transport properties
Journal article, 2019

We investigate different types of time-dependently driven single-particle sources whose common feature is that they produce pulses of integer charge and minimally excite the Fermi sea. These sources are: a slowly driven mesoscopic capacitor, a Lorentzian-shaped time-dependent bias voltage, and a local gate-voltage modulation of a quantum Hall edge state. They differ by their specific driving protocols, e.g., they have a pure ac driving or a driving with a dc component. In addition, only in the first of these setups, strong confinement leading to a discrete energy spectrum of the conductor, is exploited for the single-particle emission. Here, we study if and how these basic differences impact transport properties. Specifically, we address time- and energy-resolved charge and energy currents, as well as their zero-frequency correlators (charge, energy, and mixed noise), as they are frequently used to characterize experiments in quantum optics with electrons. Beyond disparities due to a different number and polarity of particles emitted per period, we in particular identify differences in the impact, which temperature has on the observables for sources with and without energy-dependent scattering properties. We are able to characterize and quantify the effect of temperature by a small set of physically relevant parameter ratios.

energy-resolved charge and energy currents

slowly driven mesoscopic capacitor

Lorentzian-shaped time-dependent bias voltage

zero-frequency correlator

local gate-voltage modulation of a quantum Hall edge state

transport properties

Author

Nastaran Dashti

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Maciej Misiorny

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Sara Kheradsoud

Lund University

Peter Samuelsson

Lund University

Janine Splettstoesser

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 100 3 035405

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Subject Categories

Other Physics Topics

Condensed Matter Physics

DOI

10.1103/PhysRevB.100.035405

More information

Latest update

10/29/2019