Dynamical localization effect in a coupled quantum dot array driven by an AC magnetic field

Abstract

We have studied the transport properties of a ring-coupled quantum dot array driven by an AC magnetic field, which is connected to two leads, and we give the response of the transport current to the dynamical localization. We found that when the ratio of the magnetic flux to the total quantum dots number is a root of the zeroth order Bessel function, dynamical localization and collapse of quasi-energy occurs and importantly, the transport current displays a dip which is the signal of dynamical localization. The dynamical localization effect is strengthened as a result of the increase of the quantum dot number, and it is weakened on account of the increase of the dots-lead hopping rate.

Transport through artificial single-molecule magnets: Spin-pair state sequential tunneling and Kondo effects

“…[21] Thus one thinks of the artificial counterparts to molecules, [22][23][24] such as SMM. The successful fabrication of quantum dot (QD) [25][26][27][28][29][30][31][32][33] doped with a single Mn +2 ion has stimulated many studies on the quantum dot with a single magnetic ion. The theoretical investigation indicates that a II-VI semiconductor QD doped with a single Mn atom behaves like a tunable nanomagnet whose magnetization and anisotropy can be manipulated electrically.…”