Phonon Induced Pure Dephasing of Two Electron Spin States in Vertical Quantum Dot Molecules
K. Roszaka,b and P. Machnikowski b
a Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 12116 Prague, Czech Republic
b Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
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Phonon induced dephasing of two electron spin states in two vertically stacked self assembled GaAs/InGaAs quantum dots is studied. A pure dephasing process due to elastic phonon scattering is found to dominate at low temperatures. This process is independent of the spin-orbit coupling and does not require the presence of a magnetic field. It relies on interdot tunneling and the Pauli principle, which make the double quantum dot gate for spin based quantum computing possible, and therefore cannot be avoided.
DOI: 10.12693/APhysPolA.116.877
PACS numbers: 73.21.La, 03.65.Yz, 72.10.Di, 03.67.Lx