Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot

Nature Communications
Leon C CamenzindD M Zumbühl

Abstract

Understanding and control of the spin relaxation time T1 is among the key challenges for spin-based qubits. A larger T1 is generally favored, setting the fundamental upper limit to the qubit coherence and spin readout fidelity. In GaAs quantum dots at low temperatures and high in-plane magnetic fields B, the spin relaxation relies on phonon emission and spin-orbit coupling. The characteristic dependence T1 ∝ B-5 and pronounced B-field anisotropy were already confirmed experimentally. However, it has also been predicted 15 years ago that at low enough fields, the spin-orbit interaction is replaced by the coupling to the nuclear spins, where the relaxation becomes isotropic, and the scaling changes to T1 ∝ B-3. Here, we establish these predictions experimentally, by measuring T1 over an unprecedented range of magnetic fields-made possible by lower temperature-and report a maximum T1 = 57 ± 15 s at the lowest fields, setting a record electron spin lifetime in a nanostructure.

References

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Citations

Sep 29, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·V N Stavrou
Mar 6, 2019·The Review of Scientific Instruments·Pengjie WangXi Lin
Jun 8, 2019·Physical Review Letters·Leon C CamenzindDominik M Zumbühl
Jan 5, 2019·Physical Review Letters·Denis R CandidoJ Carlos Egues
Jul 9, 2020·Physical Review Letters·Xin ZhangGuo-Ping Guo
Mar 7, 2019·Nature Communications·A R MillsJ R Petta
Nov 27, 2020·Journal of Low Temperature Physics·A T JonesR P Haley
Dec 9, 2020·Advanced Materials·Mengyu ChangJun Lin
Mar 1, 2021·The Journal of Chemical Physics·Thomas P FayDavid E Manolopoulos
Aug 17, 2021·Physical Review Letters·Leon C CamenzindDominik M Zumbühl
Oct 26, 2018·Nano Letters·Lada VukušićGeorgios Katsaros

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