Role of dual nuclear baths on spin blockade leakage current bistabilities

Abstract

Spin-blockaded electronic transport across a double quantum dot (DQD) system represents an important advancement in the area of spin-based quantum information. The basic mechanism underlying the blockade is the formation of a blocking triplet state. The bistability of the leakage current as a function of the applied magnetic field in this regime is believed to arise from the effect of nuclear Overhauser fields on spin-flip transitions between the blocking triplet and the conducting singlet states. The objective of this paper is to present the nuances of considering a two bath model on the experimentally observed current bistability by employing a self consistent simulation of the nuclear spin dynamics coupled with the electronic transport of the DQD set up. In doing so, we first discuss the important subtleties involved in the microscopic derivation of the hyperfine mediated spin flip rates. We then give insights as to how the differences between the two nuclear baths and the resulting difference Overhauser field affect the two-electron states of the DQD, and their connection with the experimentally observed current hysteresis curve.

9 pages, 5 figures

References in corpus (10)

• Coherent control of a single electron spin with electric fields
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
• Tunneling through molecules and quantum dots: master-equation approaches
• A Generic Model for Current Collapse in Spin Blockaded Transport
• Spin-flip phonon-mediated charge relaxation in double quantum dots
• Thermoelectric spin accumulation and long-time spin precession in a non-collinear quantum dot spin valve
• Self-sustaining dynamical nuclear polarization oscillations in quantum dots
• Temperature-dependent dynamical nuclear polarization bistabilities in double quantum dots in the spin-blockade regime
• Self-sustained current oscillations in spin-blockaded quantum dots

Cited by in corpus (2)

• Landauer-Büttiker approach for hyperfine mediated electronic transport in the integer quantum Hall regime
• The effect of magnetic impurity scattering on transport in topological insulators