Signatures of Hyperfine, Spin-Orbit, and Decoherence Effects in a Pauli Spin Blockade

2016/03/15 by T. Fujita, P. Stano, Peter Stano +17 · 1 citation
Chemistry · Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Blockade #Chemistry #Condensed matter physics #Coulomb blockade #Electron #Hyperfine structure #Magnetic field #Pauli exclusion principle #Physics #Quantum #Quantum and electron transport phenomena #Quantum decoherence #Quantum dot #Quantum mechanics #Quantum tunnelling #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.117.206802

published as Phys. Rev. Lett. 117, 206802 (2016) · 12 pages, 7 figures

arxiv created 2016/03/15 · openalex publication_date 2016/11/11 · arxiv updated 2016/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We detect in real time interdot tunneling events in a weakly coupled two-electron double quantum dot in GaAs. At finite magnetic fields, we observe two characteristic tunneling times T_d and T_b, belonging to, respectively, a direct and a blocked (spin-flip-assisted) tunneling. The latter corresponds to the lifting of a Pauli spin blockade, and the tunneling times ratio η=T_b/T_d characterizes the blockade efficiency. We find pronounced changes in the behavior of η upon increasing the magnetic field, with η increasing, saturating, and increasing again. We explain this behavior as due to the crossover of the dominant blockade-lifting mechanism from the hyperfine to spin-orbit interactions and due to a change in the contribution of the charge decoherence.

Citations

• Nonlinear spin to charge conversion in mesoscopic structures
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Theory of Anisotropic Exchange in Laterally Coupled Quantum Dots
• Theory of Phonon-Induced Spin Relaxation in Laterally Coupled Quantum Dots
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
• Singlet-triplet splitting in double quantum dots due to spin-orbit and hyperfine interactions
• Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
• Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot
• Spin State Readout by Quantum Jump Technique: For the Purpose of Quantum Computing
• Single-shot read-out of an individual electron spin in a quantum dot

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