Effect of Exchange Interaction on Spin Dephasing in a Double Quantum Dot

2005/12/31 by E. A. Laird, J. R. Petta, A. C. Johnson +6 · 7 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.97.056801

published as Phys. Rev. Lett. 97, 056801 (2006). · see related papers at http://marcuslab.harvard.edu

arxiv created 2006/07/03 · openalex publication_date 2006/07/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We measure singlet-triplet dephasing in a two-electron double quantum dot in the presence of an exchange interaction which can be electrically tuned from much smaller to much larger than the hyperfine energy. Saturation of dephasing and damped oscillations of the spin correlator as a function of time are observed when the two interaction strengths are comparable. Both features of the data are compared with predictions from a quasistatic model of the hyperfine field.

Citations

• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
• Single-shot read-out of an individual electron spin in a quantum dot

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