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Sequential magnetotunneling in a vertical Quantum Dot tuned at the crossing to higher spin states

B. Jouault·G. Santoro·A. Tagliacozzo
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Abstract

We have calculated the linear magnetoconductance across a vertical parabolic Quantum Dot with a magnetic field in the direction of the current. Gate voltage and magnetic field are tuned at the degeneracy point between the occupancies N=2 and N=3, close to the Singlet-Triplet transition for N=2. We find that the conductance is enhanced prior to the transition by nearby crossings of the levels 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 from S=1/2 to S=3/2, due to spin selection rule. At low temperature this dip is very sharp, but the peak is recovered by increasing the temperature.

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B. Jouault, G. Santoro, A. Tagliacozzo. 1999-11-15. Sequential magnetotunneling in a vertical Quantum Dot tuned at the crossing to higher spin states. https://doi.org/10.1103/physrevb.61.10242

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