Spin dynamics at the singlet-triplet crossings in double quantum dot

Abstract

We simulate the control of the spin states in a two-electron double quantum dot when an external detuning potential is used for passing the system through an anticrossing. The hyperfine coupling of the electron spins with the surrounding nuclei causes the anticrossing of the spin states but also the decoherence of the spin states. We calculate numerically the singlet-triplet decoherence for different detuning values and find a good agreement with experimental measurement results of the same setup. We predict an interference effect due to the coupling of T0 and T+ states.

4 pages, 5 figures

References in corpus (4)

• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• A coherent beam splitter for electronic spin states
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Tunable Quantum Beam Splitters for Coherent Manipulation of a Solid-State Tripartite Qubit System

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• The visibility study of S-T${}_{+}$ Landau-Zener-Stückelberg oscillations without applied initialization
• Dynamics of spin relaxation in nonequilibrium magnetic nanojunctions
• Y-junction splitting spin states of moving quantum dot