Spin blockade and coherent dynamics of high-spin states in a three-electron double quantum dot

Abstract

Asymmetry in a three-electron double quantum dot (DQD) allows spin blockade, when spin-3/2 (quadruplet) states and spin-1/2 (doublet) states have different charge configurations. We have observed this DQD spin blockade near the (1,2)-(2,1) charge transition using a pulsed-gate technique and a charge sensor. We then use this spin blockade to detect Landau-Zener-Stückelberg (LZS) interference and coherent oscillations between the spin quadruplet and doublet states. Such studies add to our understandings of coherence and control properties of three-spin states in a double dot, which in turn would benefit the explorations into various qubit encoding schemes in semiconductor nanostructures.

14 pages, 4 figures, and Supplementary Materials

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• Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit
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• Charge-noise resilience of two-electron quantum dots in Si/SiGe heterostructures
• Lifting of Spin Blockade by Charged Impurities in Si-MOS Double Quantum Dot Devices
• Modelling and Control of Quantum Measurement Induced Backaction in Double Quantum Dots
• On the validity of microscopic calculations of double-quantum-dot spin qubits based on Fock-Darwin states
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