Double nuclear spin switching in single quantum dots

Hyperfine interaction in a quantum dot produces a spin-coupled system between an injected electron and a few tens of thousands of nuclei in the electron wavefunction. We report here that the double bistable phenomenon of nuclear spin polarization (NSP) can be observed by sweeping three control parameters. All the observations indicate that the NSP has three stable branches under a longitudinal magnetic field, whereas the number of the stable branches of NSP has been believed to be two at most. The incorporation of the electron spin relaxation due to the nuclear spin fluctuation enables reproduction of the observed features of the NSP and the electron spin polarization. (c) 2021 The Japan Society of Applied Physics

Automated summary

Experimental observations on nuclear spin polarization in quantum dots reveal that under a longitudinal magnetic field, there are three stable branches of nuclear spin polarization, contrary to the previous belief of at most two stable branches. The incorporation of electron spin relaxation due to nuclear spin fluctuation allows for the reproduction of observed features of nuclear spin polarization and electron spin polarization.