An Improved 2.5 GHz Electron Pump: Single-Electron Transport through Shallow-Etched Point Contacts Driven by Surface Acoustic Waves

• Authors: P. Utko , K. Gloos , J. Hansen , P. Lindelof
• Languages of publication: EN

Abstracts

EN

We present an experimental study of a 2.5 GHz electron pump based on the quantized acoustoelectric current driven by surface acoustic waves through a shallow-etched point contact in a GaAs/AlGaAs heterostructure. At low temperatures and with an additional counter-propagating surface acoustic waves beam, up to n=20 current plateaus at I=nef could be resolved, where n is an integer, e the electron charge, and f the surface acoustic waves frequency. In the best case the accuracy of the first plateau at 0.40 nA was estimated to beΔ I/I=±25 ppm over 0.25 mV in gate voltage, which is better than previous results.

Keywords

EN

73.63.Kv; 72.50.+b; 06.20.Jr

Discipline

• 06.20.Jr: Determination of fundamental constants
• 72.50.+b: Acoustoelectric effects
• 73.63.Kv: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2003
• Volume: 103
• Issue: 6
• Pages: 533-538

Dates

published

2003-06

received

2003-05-30

Contributors

author

P. Utko

• Nano-Science Center, Niels Bohr Institute fAFG, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark

author

K. Gloos

• Nano-Science Center, Niels Bohr Institute fAFG, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark

author

J. Hansen

• Nano-Science Center, Niels Bohr Institute fAFG, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark

author

P. Lindelof

• Nano-Science Center, Niels Bohr Institute fAFG, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark

References

• 1. J.M. Shilton, V.I. Talyanskii, M. Pepper, D.A. Ritchie, J.E.F. Frost, C.J.B. Ford, C.G. Smith, G.A.C. Jones, J. Phys., Condens. Matter, 8, L531, 1996
• 2. V.I. Talyanskii, J.M. Shilton, M. Pepper, C.G. Smith, C.J.B. Ford, E.H. Linfield, D.A. Ritchie, G.A.C. Jones, Phys. Rev. B, 56, 15180, 1997
• 3. J. Cunningham, V.I. Talyanskii, J.M. Shilton, M. Pepper, A. Kristensen, P.E. Lindelof, Phys. Rev. B, 62, 1564, 2000
• 4. J. Cunningham, V.I. Talyanskii, J.M. Shilton, M. Pepper, M.Y. Simmons, D.A. Ritchie, Phys. Rev. B, 60, 4850, 1999
• 5. J. Ebbecke, K. Pierz, F.J. Ahlers, Physica E, 12, 466, 2002
• 6. L.P. Kouwenhoven, A.T. Johnson, N.C. van der Vaart, C.J.P.M. Harmans, Phys. Rev. Lett., 67, 1626, 1991
• 7. M.W. Keller, J.M. Martinis, R.L. Kautz, Phys. Rev. Lett., 80, 4530, 1998
• 8. M. Switkes, C.M. Marcus, K. Campman, A.C. Gossard, Science, 283, 1905, 1999
• 9. K. Flensberg, Q. Niu, M. Pustilnik, Phys. Rev. B, 60, R16291, 1999
• 10. A.M. Robinson, C.H.W. Barnes, Phys. Rev. B, 63, 165418, 2001
• 11. P.A. Maksym, Phys. Rev. B, 61, 4727, 2000
• 12. A. Kristensen, H. Bruus, A.E. Hansen, J.B. Jensen, P.E. Lindelof, C.J. Marckmann, J. Nygå rd, C.B. Sørensen, F. Beuscher, A. Forchel, M. Michel, Phys. Rev. B, 62, 10950, 2000

Identifiers

DOI

10.12693/APhysPolA.103.533