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Four Terminal Resistance of a Multichannel Electron Waveguide

  • G. Timp
  • H. U. Baranger
  • P. de Vegvar
  • R. Behringer
  • J. E. Cunningham
  • P. M. Mankiewich
  • R. E. Howard
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 83)

Abstract

We have measured the four terminal magnetoresistance of a multichannel electron waveguide, i.e. a submicron wire fabricated in extremely high mobility GaAs/AlGaAs heterostructure. Only a few transverse, one dimensional subbands or channels carry the current in this submicron wire because the width is comparable to an electron wavelength. We observe that the average resistance increases when the current path bends through a junction at or beyond the voltage terminals, and attribute the increase to a change (due to the bend) in the relative transmittance of the few transverse channels which carry the current. Our observations reveal that in these devices the average resistance is predominately associated with scattering from the leads used for the measurement.

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References

  1. 1.
    Sean Washburn and Richard A. Webb, Advan. Phys. 35, 375 (1986).CrossRefGoogle Scholar
  2. 2.
    G. Timp, A. M. Chang, P. Manldewich, R. Behringer, J. E. Cunningham, T. Y. Chang and R. E. Howard, Phys. Rev. Lett. 59, 732 (1987).CrossRefGoogle Scholar
  3. 3.
    W. J. Skocpol, P. M. Mankiewich, R. E. Howard, L D. Jacket, D. M. Tennant and A. D. Stone, Phys. Rev. Lett. 58, 2347 (1987).CrossRefGoogle Scholar
  4. 4.
    A. Benoit, C. P. Umbach, R. B. Laibowitz and R. A. Webb, Phys. Rev. Lett. 58, 2343 (1987).CrossRefGoogle Scholar
  5. 5.
    A.D. Benoit, S. Washburn, C.P. Umbach, R.B. Laibowitz, and RA Webb, Phys. Rev. Lett. 57, 1765 (1986).CrossRefGoogle Scholar
  6. 6.
    G. Timp, H. U. Baranger, P. deVegvar, J. E. Cunningham, R. E. Howard, R. Behringer, and P. M. Mankewich, to appear in Phys. Rev. Lett.Google Scholar
  7. 7.
    M. Buttiker, Phys. Rev. Lett. 57, Localization, Interaction, and Transport Phenomena, edited by G. Bergmann and Y. Bruynseraede, Springer-Verlag, Heidelberg, New York (1985) p. 38–50.Google Scholar
  8. 8.
    P. M. Mankiewich, R. E. Behringer, R. E. Howard, A. M. Chang, T. Y. Chang, B. Chelluri, J. E. Cunningham, G. Timp, J. Vac. Sci. Tech. B 6, 131 (1988).CrossRefGoogle Scholar
  9. 9.
    J.E. Cunningham, W.T. Tsang, G. Timp, E.F. Schubert, A.M. Chang and K Owusu-Sekyere, Phys. Rev. BI 37, 4317 (1988).CrossRefGoogle Scholar
  10. 10.
    G. Timp, A.M. Chang, J.E. Cunningham, P.M. Mankiewich, R. Behringer, T.Y. Chang, R.E. Howard, Phys. Rev. Lett: 58, 2814 (1987).CrossRefGoogle Scholar
  11. 11.
    M.L Roukes, A. Scherer, S.J. Allen Jr., H.G. Craighead, R.M. Ruthen, E.D. Beebe, and J.P. Harbison, Phys. Rev Lett. 59, 3011 (1987).CrossRefGoogle Scholar
  12. 12.
    G. Timp, A. M. Chang, P. deVegvar, R. E. Howard, R. E. Behringer, J. E. Cunningham and P. M. Mankiewich, Surf. Sci. 196, 68 (1988).CrossRefGoogle Scholar
  13. 13.
    A.D. Stone, Phys. Rev. Lett. 54, (1985) 2692.CrossRefGoogle Scholar
  14. 14.
    P.A. Lee and D.S. Fisher, Phys. Rev. Lett. 47, 882 (1981).CrossRefGoogle Scholar
  15. 15.
    H.U. Baranger, A.D. Stone, and D.P. DiVincenzo, to be appear in Phys. Rev. B.Google Scholar
  16. 16.
    A. Szafer and A. D. Stone, to appear in IBM J. Res. Devlop.Google Scholar
  17. 17.
    H.U. Baranger, unpublished.Google Scholar
  18. 18.
    S. DasSarma and F. Stern, Phys. Rev. B 32, 8442 (1985).CrossRefGoogle Scholar
  19. 19.
    F. F. Fang, T. P. Smith and S. L Wright, Surf. Sci. 196, 1988 (1988).CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • G. Timp
    • 1
  • H. U. Baranger
    • 1
  • P. de Vegvar
    • 1
  • R. Behringer
    • 1
  • J. E. Cunningham
    • 1
  • P. M. Mankiewich
    • 1
  • R. E. Howard
    • 1
  1. 1.4G-18, AT&T Bell LaboratoriesHolmdelUSA

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