Magnetic field induced effects in the high source-drain bias current of weakly coupled vertical quantum dot molecules

TL;DR

This paper investigates magnetic field effects on high bias current in weakly coupled vertical quantum dot molecules, revealing resonance, oscillation, and hysteresis phenomena outside the typical spin-blockade regime.

Contribution

It reports novel magnetic field induced effects in quantum dot molecules at high bias outside the spin-blockade regime, expanding understanding of magnetic influences on quantum dot transport.

Findings

Observation of magnetic field resonance and oscillations

Detection of hysteresis effects in current

Effects observed at high source-drain bias and strong magnetic fields

Abstract

We report on the basic properties of recently observed magnetic field resonance, induced time dependent oscillation, and hysteresis effects in the current flowing through two weakly coupled vertical quantum dots at high source-drain bias (up to a few tens of mV). These effects bare some similarity to those reported in the N=2 spin-blockade regime, usually for weak in-plane magnetic field, of quantum dot molecules and attributed to hyperfine coupling, except here the measurements are conducted outside of the spin-blockade regime and the out-of-plane magnetic field is up to ~6 T.