Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 11: Focus Session: Single Particle Sources for Electronic Devices II
(Joint session of HL and TT organized by HL)

TT 11.10: Hauptvortrag

Montag, 7. März 2016, 18:15–18:45, H10

Clocked single-electron transfer: quantized currents and electron pair partitioning — •Frank Hohls — Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany

The clocked transfer of single electrons or electron pairs has applications both in metrology as quantized current source and in basic physics as building block for electron quantum optics. In the future redefinition of the International System of Units (SI), expected for 2018, the unit of the electrical current will be derived from a clock frequency f and the elementary charge e, I=nef. A promising realization is the non-adiabatic tunable-barrier pump which allows to transfer a highly quantized number of electrons n even at GHz driving frequency [1]. We will present latest results on accuracy verification of the resulting current quantization. For a pump driven at 545 MHz we find an agreement with I=ef within the measurement uncertainty of 0.2 ppm [2]. Interestingly, the same type of electron pump also allows the controlled emission of electrons and electron pairs into a one-dimensional ballistic conductor formed at the edge of a quantum Hall system, opening the route to electron quantum optics experiments. We have examined the partitioning of such electrons at an electronic beam splitter using correlation measurements which validate high fidelity pair splitting and additionally reveal interesting correlation effects for the partitioning of electron pairs [3].

[1] B. Kaestner & V. Kashcheyevs, Rep. Prog. Phys. 78, 103901 (2015).

[2] F. Stein et al., Appl. Phys. Lett. 107, 103501 (2015).

[3] N. Ubbelohde et al., Nature Nanotechnol. 10, 46 (2015).