The realization of a high spin state, which is related to ferromagnetism and molecular magnetism, has been an attractive research topic. Here, using the nonequilibrium condition, we realize a high population of the quadruplet states (total spin $S$ = 3/2) in a double quantum dot containing three electrons. Owing to Pauli exclusion, the quadruplet states are forbidden to transit to states with electron double occupancy. Thus, it is located at the end of the dead-end path in a charge transfer cycle, and the three-electron state is stacked at the quadruplet state once it is accessed. As a result of the high population in the three-electron quadruplet spin states, current suppression is observed even under a high bias, which was also reproduced by a simple theoretical model.

• Received 11 February 2013
• Revised 13 December 2013

DOI:https://doi.org/10.1103/PhysRevB.89.085302