Tunable Exchange Interaction in Quantum Dot Devices

Details Tunable Exchange Interaction in Quantum Dot Devices Tunable Exchange Interaction in Quantum Dot Devices

2004-04-26

arxiv.org/abs/cond-mat/0404607v1

Japan Journal of Applied Physics, Vol. 43, No. 5B : L691 - L693 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1143/JJAP.43.L691

We theoretically discuss the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between semiconductor quantum dots (QDs). When each QD having a local spin is coupled to the conduction electrons in semiconductors, an indirect exchange interaction, i.e., the RKKY interaction, is induced between two local spins. The RKKY interaction between QDs, which is mediated by the Fermi sea in semiconductors, is modulated by changing the Fermi energy, and the magnitude or even the sign of the exchange interaction can be tuned, which leads to a tunable magnetic transition in QD devices. We estimate the magnitude of the RKKY interaction in QDs as a function of the electron density and the inter-dot distance.

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