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.
Original language | English |
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Pages (from-to) | 335-344 |
Number of pages | 10 |
Journal | Physica A: Statistical Mechanics and its Applications |
Volume | 302 |
Issue number | 1-4 |
DOIs | |
State | Published - 15 Dec 2001 |
Event | International Workshop on Frontiers in the Physics of Complex Systems - Ramat-Gan, Israel Duration: 25 Mar 2001 → 28 Mar 2001 |
Funding
Funders | Funder number |
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AFIRST | |
French Ministry of Research and Technology | |
Israeli Ministry of Science | |
Alexander von Humboldt-Stiftung | |
Academy of Leisure Sciences | |
Deutsche Forschungsgemeinschaft | |
German-Israeli Foundation for Scientific Research and Development |