Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-02-18
Physical Review B 73, 125329 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.73.125329
Dipolar interaction between the magnetic moments of electrons is studied as a source for electron spin decay in quantum dots or arrays of quantum dots. This magnetic interaction will govern spin decay, after other sources, such as the coupling to nuclear spins or spin orbit coupling, have been eliminated by a suitable sample design. Electron-electron (Coulomb) interactions, important for magnetic properties, are included. Decomposing the dipolar operator according to the symmetric group of electron permutations allows one to deduce vanishing decay channels as a function of electron number and spatial symmetries of the quantum dot(s). Moreover, we incorporate the possibility of rapid phonon induced spin conserving transitions which crucially affect the temperature dependence of spin decay rates. An interesting result is that a sharp increase of the spin decay rate occurs already at relatively low temperatures.
Hänggi Peter
Häusler Wolfgang
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