Coulomb-blockade peak-spacing distribution: Interplay of temperature and spin

Journal Article

We calculate the Coulomb-blockade peak-spacing distribution at finite temperature using the recently introduced "universal Hamiltonian" to describe the e-e interactions. We show that the temperature effect is important even at kBT∼Δ (Δ is the single-particle mean level spacing). This sensitivity arises because: 1) exchange reduces the minimum energy of excitation from the ground state, and 2) the entropic contribution depends on the change of the spin of the quantum dot. Including the leading corrections to the universal Hamiltonian yields results in quantitative agreement with the experiments. Surprisingly, temperature appears to be the most important effect.

Duke Authors

Cited Authors

  • Usaj, G; Baranger, HU

Published Date

  • 2001

Published In

Volume / Issue

  • 64 / 20

Start / End Page

  • 2013191 - 2013194

International Standard Serial Number (ISSN)

  • 0163-1829