Detection and measurement of the Dzyaloshinskii-Moriya interaction in double quantum dot systems*

Spins in quantum dots can act as qubits for quantum computation. In this context we point out that spins on neighboring dots will experience the Dzyaloshinskii-Moriya interaction, which mixes the spin singlet and triplet states. This will have a strong influence on spin-dependent tunneling. We show that the effects of this interaction depend strongly on the direction of the external field, and demonstrate how to detect and measure the effect.