Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 11, Pages 2485-2488Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.2485
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We determine contributions from the direct Coulomb and exchange interactions to the total interaction in artificial semiconductor atoms. We tune the relative strengths of the two interactions and measure them as a function of the number of confined electrons. The electrons tend to have parallel spins when they occupy nearly degenerate single-particle states. We use a magnetic field to adjust the single-particle-state degeneracy, and find that the spin configurations in an arbitrary magnetic field are well explained in terms of two-electron singlet and triplet states.
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