Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-10-06
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
31 pages, 7 figures, accepted to March 15, 2007 issue of Phys. Rev. B, vol. 75
Scientific paper
We analyze theoretically and experimentally the electronic structure and charging diagram of three coupled lateral quantum dots filled with electrons. Using the Hubbard model and real-space exact diagonalization techniques we show that the electronic properties of this artificial molecule can be understood using a set of topological Hunds rules. These rules relate the multi-electron energy levels to spin and the inter-dot tunneling $t$, and control charging energies. We map out the charging diagram for up to N=6 electrons and predict a spin-polarized phase for two holes. The theoretical charging diagram is compared with the measured charging diagram of the gated triple-dot device.
Gaudreau Louis
Gimenez Irene Puerto
Hawrylak Pawel
Korkusinski Marek
Sachrajda Andrew. S.
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