We report anomalous critical transport behavior in a GaAs structure containing a dense array of ErAs quantum dots. The structure displays a voltage (electric field)-controlled insulator-to-metal transition and strong hysteresis in the Kondo-like current-vs-temperature characteristic, with critical temperatures as high as 50 K. We attribute this behavior to a strong distributed Kondo resonance between the quantum dots after the Coulomb blockade of the array is lifted. This is consistent with a high sensitivity of the phase transition to a small external magnetic field that we have observed in the Voigt configuration, and a phenomenological model based on the RKKY interaction within a quantum dot and the cooperative Kondo-resonance amongst quantum dots.
@article{arxiv.1711.01188,
title = {Kondo-Resonance Mediated Metal-Insulator Transition in GaAs Embedded with Erbium Arsenide Quantum Dots},
author = {W-D. Zhang and E. R. Brown and A. D. Feldman and T. E. Harvey and R. P. Mirin},
journal= {arXiv preprint arXiv:1711.01188},
year = {2017}
}