Measurements of Kondo and spin splitting in single-electron transistors.
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.
Kogan
A
A
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Amasha
S
S
Goldhaber-Gordon
D
D
Granger
G
G
Kastner
M A
MA
Shtrikman
Hadas
H