Breakdown of phase rigidity and variations of the Fano effect in closed Aharonov-Bohm interferometers

Amnon Aharony, Ora Entin-Wohlman, Tomohiro Otsuka, Shingo Katsumoto, Hisashi Aikawa, and Kensuke Kobayashi
Phys. Rev. B 73, 195329 – Published 30 May 2006

Abstract

Although the conductance of a closed Aharonov-Bohm interferometer, with a quantum dot on one branch, obeys the Onsager symmetry under magnetic field reversal, it needs not be a periodic function of this field: The conductance maxima move with both the field and the gate voltage on the dot, in an apparent breakdown of “phase rigidity.” These experimental findings are explained theoretically as resulting from multiple electronic paths around the interferometer ring. Data containing several Coulomb blockade peaks, whose shapes change with the magnetic flux, are fitted to a simple model, in which each resonant level on the dot couples to a different path around the ring.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
4 More
  • Received 16 December 2005

DOI:https://doi.org/10.1103/PhysRevB.73.195329

©2006 American Physical Society

Authors & Affiliations

Amnon Aharony1,2,3, Ora Entin-Wohlman1,2,3, Tomohiro Otsuka1, Shingo Katsumoto1,*, Hisashi Aikawa1,†, and Kensuke Kobayashi1,‡

  • 1Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8581, Japan
  • 2School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
  • 3Physics Department, Ben Gurion University, Beer Sheva 84105, Israel

  • *Email address: kats@issp.u-tokyo.ac.jp
  • Present address: Toshiba Corporation, Research and Development Center, 1, Komukai Toshibacho, Saiwai-ku, Kawasaki-shi, 212-8582 Kanagawa, Japan.
  • Present address: Institute of Chemical Research, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan.

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 73, Iss. 19 — 15 May 2006

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×