Coulomb Blockade Resonances in Quantum Wires
T. Rejec (1), A. Ramsak (1, 2), and J. H. Jefferson (3) ((1) J., Stefan Institute, Ljubljana, Slovenia, (2) Faculty of Mathematics and, Physics, University of Ljubljana, Ljubljana, Slovenia, (3) DERA, Electronic, Sector, Great Malvern, England)
TL;DR
This paper provides an exact solution for conductance in a quantum wire with a weak bulge, revealing spin-dependent Coulomb blockade resonances that produce characteristic conductance anomalies near 0.25 and 0.7 times 2e^2/h, stable at low temperatures.
Contribution
It introduces an exact theoretical analysis of Coulomb blockade resonances in quantum wires, highlighting spin-dependent effects and their robustness across different wire geometries.
Findings
Resonances occur near 0.25 and 0.7 (2e^2/h) conductance levels.
Resonances are related to singlet and triplet states.
These features persist at temperatures of a few degrees.
Abstract
The conductance through a quantum wire of cylindrical cross section and a weak bulge is solved exactly for two electrons within the Landauer-Buettiker formalism. We show that this 'open' quantum dot exhibits spin-dependent Coulomb blockade resonances resulting in two anomalous structure on the rising edge to the first conductance plateau, one near 0.25(2e^2/h), related to a singlet resonance, and one near 0.7(2e^2/h), related to a triplet resonance. These resonances are generic and robust, occurring for other types of quantum wire and surviving to temperatures of a few degrees.
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