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

Leon C. Camenzind, Liuqi Yu, Peter Stano, Jeramy D. Zimmerman, Arthur C. Gossard, Daniel Loss and Dominik M. Zumbühl ()
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Leon C. Camenzind: University of Basel
Liuqi Yu: University of Basel
Peter Stano: RIKEN
Jeramy D. Zimmerman: University of California
Arthur C. Gossard: University of California
Daniel Loss: University of Basel
Dominik M. Zumbühl: University of Basel

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-05879-x

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