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Coulomb blockade peak spacings: Interplay of spin and dot-lead coupling

Publication ,  Journal Article
Vorojtsov, S; Baranger, HU
Published in: Physical Review B - Condensed Matter and Materials Physics
October 15, 2005

For Coulomb blockade peaks in the linear conductance of a quantum dot, we study the correction to the spacing between the peaks due to dot-lead coupling. This coupling can affect measurements in which Coulomb blockade phenomena are used as a tool to probe the energy level structure of quantum dots. The electron-electron interactions in the quantum dot are described by the constant exchange and interaction (CEI) model while the single-particle properties are described by random matrix theory. We find analytic expressions for both the average and rms mesoscopic fluctuation of the correction. For a realistic value of the exchange interaction constant Js, the ensemble average correction to the peak spacing is two to three times smaller than that at Js=0. As a function of Js, the average correction to the peak spacing for an even valley decreases monotonically, nonetheless staying positive. The rms fluctuation is of the same order as the average and weakly depends on Js. For a small fraction of quantum dots in the ensemble, therefore, the correction to the peak spacing for the even valley is negative. The correction to the spacing in the odd valleys is opposite in sign to that in the even valleys and equal in magnitude. These results are robust with respect to the choice of the random matrix ensemble or change in parameters such as charging energy, mean level spacing, or temperature. © 2005 The American Physical Society.

Duke Scholars

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

October 15, 2005

Volume

72

Issue

16

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

Citation

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Vorojtsov, S., & Baranger, H. U. (2005). Coulomb blockade peak spacings: Interplay of spin and dot-lead coupling. Physical Review B - Condensed Matter and Materials Physics, 72(16). https://doi.org/10.1103/PhysRevB.72.165349
Vorojtsov, S., and H. U. Baranger. “Coulomb blockade peak spacings: Interplay of spin and dot-lead coupling.” Physical Review B - Condensed Matter and Materials Physics 72, no. 16 (October 15, 2005). https://doi.org/10.1103/PhysRevB.72.165349.
Vorojtsov S, Baranger HU. Coulomb blockade peak spacings: Interplay of spin and dot-lead coupling. Physical Review B - Condensed Matter and Materials Physics. 2005 Oct 15;72(16).
Vorojtsov, S., and H. U. Baranger. “Coulomb blockade peak spacings: Interplay of spin and dot-lead coupling.” Physical Review B - Condensed Matter and Materials Physics, vol. 72, no. 16, Oct. 2005. Scopus, doi:10.1103/PhysRevB.72.165349.
Vorojtsov S, Baranger HU. Coulomb blockade peak spacings: Interplay of spin and dot-lead coupling. Physical Review B - Condensed Matter and Materials Physics. 2005 Oct 15;72(16).

Published In

Physical Review B - Condensed Matter and Materials Physics

DOI

EISSN

1550-235X

ISSN

1098-0121

Publication Date

October 15, 2005

Volume

72

Issue

16

Related Subject Headings

  • Fluids & Plasmas
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences