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Pumping at resonant transmission and transferred charge quantization

Author

Listed:
  • Levinson, Y.
  • Entin-Wohlman, O.
  • Wölfle, P.

Abstract

We consider pumping through a small quantum dot separated from the leads by two point contacts, whose conductances, G1 and G2, serve as pumping parameters. When the dot is pinched, i.e., G1,G2⪡e2/h, we find that there is a “resonance line” in the parameter plane {G1,G2} along which the Fermi energy in the leads aligns with the energy of the quasi-bound state in the quantum dot. When G1 and G2 are modulated periodically and adiabatically such that the pumping contour defined by G1=G1(t) and G2=G2(t) encircles the resonance line, the current is quantized: the charge pumped through the dot during each period of the modulation is close to a single electronic charge.

Suggested Citation

  • Levinson, Y. & Entin-Wohlman, O. & Wölfle, P., 2001. "Pumping at resonant transmission and transferred charge quantization," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 302(1), pages 335-344.
    • Handle: RePEc:eee:phsmap:v:302:y:2001:i:1:p:335-344
    DOI: 10.1016/S0378-4371(01)00451-4
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