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TT: Tiefe Temperaturen
TT 25: FV-internes Symposium ”Superconducting Qubits and π-junctions”
TT 25.5: Fachvortrag
Donnerstag, 11. März 2004, 11:45–12:15, H20
Semifluxons as a base for classical and quantum digital circuits? — •Edward Goldobin, Tobias Gaber, Albert Sterck, Dieter Koelle, and Reinhold Kleiner — Physicalische Institut II, Universität Tübingen
In a long Josephson junction (LJJ) made of alternating regions with positive and negative critical currents (so-called 0 and π regions) half-integer vortices (semifluxons) may spontaneously appear at the boundaries between 0 and π parts.
The semifluxons have unique properties: they are pinned at the 0-π-boundary but may have two different polarities corresponding to the half integer flux +Φ0/2 and −Φ0/2. In comparison with the freely moving fluxon, the semifluxon represents the ground state of the system and therefore is extremely stable. Semifluxons may be obtained and investigated in 0-π-junctions made of d-wave superconductors, in junctions with ferromagnetic barrier or in conventional LJJs with specially designed injectors.
In this talk I discuss the properties of semifluxons and their interaction with integer fluxons (solitons) in view of possible applications for information storage and processing in classical and quantum domains.