Asymmetry with respect to the magnetic field direction in the interaction between the quantum states of two coupled superconducting rings

  • V. I. KuznetsovEmail author
  • A. A. Firsov
  • S. V. Dubonos
  • M. V. Chukalina
Proceedings of the XXXIV Conference on Low-Temperature Physics “NT-34”


The interaction between the quantum states of two circularly asymmetric superconducting aluminum rings forming figure eight, threaded by a magnetic flux and biased by an external sinusoidal ac current with zero dc component, has been investigated. Quantum oscillations in the dependence V dc(B) of the rectified dc voltage on magnetic field for these structures have been measured at different external currents and temperatures close to critical. Fourier and wavelet analyses of the function V dc(B) have revealed, along with the two fundamental ring frequencies, various combination frequencies; this fact is indicative of interaction in the structure. Deviation of the function V dc(B) from oddness with respect to the magnetic field direction has been found for the first time.


Quantum State Fundamental Frequency Fourier Spectrum Quantum Oscillation Magnetic Field Direction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Dubonos, S.V. et al., Pis’ma Zh. Eksp. Teor. Fiz., 2003, vol. 77, no. 7, p. 439 [JETP Lett. (Engl. Transl.), vol. 77, no. 7, p. 371].Google Scholar
  2. 2.
    Little, W.A. and Parks, R.D., Phys. Rev. Lett., 1962, vol. 9, p. 9.CrossRefADSGoogle Scholar
  3. 3.
    Bruyndoncx, L.V. et al., Europhys. Lett., 1996, vol. 36, p. 449.CrossRefADSGoogle Scholar
  4. 4.
    Bezryadin, D.A., Lau, C.N., and Tinkham, M., Nature (London), 2000, vol. 400, p. 971.CrossRefADSGoogle Scholar
  5. 5.
    Mooij, J.E. et al., Science, 1999, vol. 285, p. 1036.CrossRefGoogle Scholar
  6. 6.
    Mooij, J.E. and Harmans, C.J.P.M., New J. Phys., 2005, vol. 7, p. 219.CrossRefADSGoogle Scholar
  7. 7.
    Louis, A. et al., Wavelets: Theory and Applications, New York: Wiley, 1997.zbMATHGoogle Scholar

Copyright information

© Allerton Press, Inc. 2007

Authors and Affiliations

  • V. I. Kuznetsov
    • 1
    Email author
  • A. A. Firsov
    • 1
  • S. V. Dubonos
    • 1
  • M. V. Chukalina
    • 1
  1. 1.Institute of Microelectronics Technology and High Purity MaterialsRussian Academy of SciencesChernogolovka, Moscow oblastRussia

Personalised recommendations