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TT: Fachverband Tiefe Temperaturen
TT 13: Transport: Poster Session
TT 13.49: Poster
Montag, 26. März 2012, 15:00–19:00, Poster B
Enhancing the hyperfine spin decoherence time of holes in quantum dots by strain — •Franziska Maier and Daniel Loss — Department of Physics, University of Basel, 4056 Basel, Switzerland
In this work we theoretically examine the effect of strain on the single spin decoherence time T2 of a heavy hole confined to a cylindrical InAs semiconductor quantum dot. To this end, we include strain in the k·p-Hamiltonian describing the states in the lowest conduction bands (CB) and the heavy hole (HH), light hole (LH) and split-off (SO) bands of the dot. For non-zero strain we find a modification of the existing confinement-induced hybridization of the HH states [1] which strongly depends on explicit values of the strain tensor components. Hyperfine interaction between the hybridized HH states and the surrounding nuclear spin bath leads to a reduction of the hole spin decoherence time T2. Our results reveal that T2 cannot only be tuned by external parameters such as nuclear polarization or external magnetic fields as it has been previously shown, but also by choosing different strain configurations.
J. Fischer and D. Loss, Phys. Rev. Lett. 105, 266603 (2010)