Singlet-Triplet Dephasing in Asymmetric Quantum Dot Molecules

• Authors: Ł. Marcinowski , K. Roszak , P. Machnikowski
• Languages of publication: EN

Abstracts

EN

We discuss pure dephasing of singlet-triplet superpositions in two-electron double quantum dots due to elastic phonon scattering. We generalize our previous results to a system built of two non-identical dots. We show that the asymmetry must be very strong in order to considerably affect the dephasing rate.

Keywords

EN

73.21.La; 03.65.Yz; 72.10.Di; 03.67.Lx

Discipline

• 03.65.Yz: Decoherence; open systems; quantum statistical methods(see also 03.67.Pp in quantum information; for decoherence in Bose-Einstein condensates, see 03.75.Gg)
• 03.67.Lx: Quantum computation architectures and implementations
• 73.21.La: Quantum dots
• 72.10.Di: Scattering by phonons, magnons, and other nonlocalized excitations(see also 71.45.-d Collective effects in electronic structure of bulk materials)

• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 116
• Issue: 5
• Pages: 874-876

Dates

published

2009-11

Contributors

author

Ł. Marcinowski

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

K. Roszak

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
• Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 12116 Prague, Czech Republic

author

P. Machnikowski

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

References

• 1. D. Loss, D.P. DiVincenzo, Phys. Rev. A 57, 120 (1998)
• 2. K. Roszak, P. Machnikowski, Phys. Rev. B 80, 195315 (2009)
• 3. J.R. Petta, A.C. Johnson, J.M. Taylor, E.A. Laird, A. Yacoby, M.D. Lukin, C.M. Marcus, M.P. Hanson, A.C. Gossard, Science 309, 2180 (2005)
• 4. F.H.L. Koppens, J.A. Folk, J.M. Elzerman, R. Hanson, L.H. Willems van Beveren, I.T. Vink, H.P. Tranitz, W. Wegscheider, L.P. Kouwenhoven, L.M.K. Vandersypen, Science 309, 1346 (2005)
• 5. A. Grodecka, P. Machnikowski, J. Förstner, Phys. Rev. B 78, 085302 (2008)

Identifiers

DOI

10.12693/APhysPolA.116.874