Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Focus Session: Young Semiconductor Forum

HL 25.1: Invited Talk

Wednesday, March 11, 2026, 09:30–10:00, POT/0251

Quantum dots for single-electron current sources — •Johannes C. Bayer, Thomas Gerster, Dario Maradan, Niels Ubbelohde, Klaus Pierz, Hans W. Schumacher, and Frank Hohls — Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany

Generating accurate currents can be achieved in an elegant and direct way by applying a periodic signal to a tunable barrier quantum dot. Such devices are called single-electron pumps (SEPs) due to their capability of emitting a well defined number of n electrons per cycle of an external drive. With driving frequency f and elementary charge e this leads to a controlled and clocked current of I = nef, thereby providing a suitable basis for a quantum current standard. While individual SEPs can already achieve errors in the sub-ppm range for currents of the order I ≈ 100 pA [1], implementing larger systems consisting of multiple well-performing SEPs remains a challenging task. We here present DC transport as well as pumping characteristics of multiple SEP devices toward scaling to higher currents.

[1] F. Stein, et. al., Metrologia 54, S1-S8 (2017)

Keywords: quantum dot; single-electron pump; electronic transport