Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 11: Nanoelektronik I: Quantenpunkte, -dr
ähte, -punktkontakte

TT 11.11: Vortrag

Dienstag, 9. März 2004, 12:00–12:15, H19

Interaction-induced damping of Aharonov-Bohm oscillations — •Thomas Ludwig^1,2 and Alexander Mirlin^1,2 — ¹Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany — ²Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany

We study the amplitudes of mesoscopic Aharonov-Bohm oscillations in diffusive metallic rings in the presence of electron-electron interaction. In the limit of strong dephasing we derive an analytical expression for the damping of the oscillations. The dephasing behaviour is qualitatively different from other situations because although L_ϕ is much shorter than the system size the dephasing mechanism is governed by energy transfers determined by the system size.