title: Measurements of Kondo and spin splitting in single-electron transistors.
abstract: We measure the spin splitting in a magnetic field B of localized states in single-electron transistors using a new method, inelastic spin-flip cotunneling. Because it involves only internal excitations, this technique gives the most precise value of the Zeeman energy Delta=/g/mu(B)B. In the same devices we also measure the splitting with B of the Kondo peak in differential conductance. The Kondo splitting appears only above a threshold field as predicted by theory. However, the magnitude of the Kondo splitting at high fields exceeds 2/g/mu(B)B in disagreement with theory.
authors.affiliation: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: A
authors.initials: A
authors.lastname: Kogan
authors.forename: S
authors.initials: S
authors.lastname: Amasha
authors.forename: D
authors.initials: D
authors.lastname: Goldhaber-Gordon
authors.forename: G
authors.initials: G
authors.lastname: Granger
authors.forename: M A
authors.initials: MA
authors.lastname: Kastner
authors.forename: Hadas
authors.initials: H
authors.lastname: Shtrikman