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We have calculated the linear magnetoconductance across a vertical parabolicQuantum Dot with a magnetic field in the direction of the current. Gate voltageand magnetic field are tuned at the degeneracy point between the occupanciesN=2 and N=3, close to the Singlet-Triplet transition for N=2. We find that theconductance is enhanced prior to the transition by nearby crossings of thelevels of the 3 particle dot. Immediately after it is depressed by roughly 1/3,as long as the total spin S of the 3 electron ground state doesn't change fromS=1/2 to S=3/2, due to spin selection rule.  At low temperature this dip is very sharp, but the peak is recovered byincreasing the temperature.Comment: 6 pages, 5 figures, 1 tabl

Sequential magnetotunneling in a vertical quantum dot tuned at the crossing to higher spin states