Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Brownian Motion (jointly with DY)
TT 36.9: Vortrag
Dienstag, 21. März 2017, 12:15–12:30, ZEU 147
Ratchet with tunable asymmetry based on ϕ Josephson junction: operation, loading & efficiency. — •Edward Goldobin1, Rosina Menditto1, Martin Weides2, Hermann Kohlstedt3, Dieter Koelle1, and Reinhold Kleiner1 — 1Physikalische Institut, Universität Tübingen, Auf der Morgenstelle 14, 72076, Tübingen, Germany — 2Physikalisches Institut, Karlsruher Institut für Technologie, 76128 Karlsruhe, Germany — 3Nanoelektronik, Technische Fakultät, Christian-Albrechts-Universität zu Kiel, D-24143 Kiel, Germany
We demonstrate experimentally the operation of a deterministic Josephson ratchet with tunable asymmetry [1]. The ratchet is based on a ϕ Josephson junction with a ferromagnetic barrier [2] operating in the underdamped regime. The ratchet operation with a load, i.e. in the presence of the additional dc counter current trying to stop the ratchet, is also demonstrated. Under these conditions the ratchet produces a non-zero output power. We estimate the efficiency of the ratchet using a general model for Josephson ratchets with hysteresis [3].
[1] R. Menditto, et al. Phys. Rev. E 94, 042202 (2016).
H. Sickinger, et al. Phys. Rev. Lett. 109, 107002 (2012).
E. Goldobin, et al., Phys. Rev. E 94, 032203 (2016).