Signatures of spin pairing in a quantum dot in the Coulomb blockade regime

Details Signatures of spin pairing in a quantum dot in the Coulomb blockade regime Signatures of spin pairing in a quantum dot in the Coulomb blockade regime

2000-02-15

arxiv.org/abs/cond-mat/0002226v1

Phys. Rev. Lett. 86, 2114 (2001)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.86.2118

Coulomb blockade resonances are measured in a GaAs quantum dot in which both shape deformations and interactions are small. The parametric evolution of the Coulomb blockade peaks shows a pronounced pair correlation in both position and amplitude, which is interpreted as spin pairing. As a consequence, the nearest-neighbor distribution of peak spacings can be well approximated by a smeared bimodal Wigner surmise, provided that interactions which go beyond the constant interaction model are taken into account.

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