Strategies for tuning a linear quadruple quantum dot array to the few electron regime
Abstract
The tunability of a versatile gate-defined lateral quadruple quantum dot array in a GaAs/AlGaAs heterostructure was investigated. Two strategies were evaluated for systematically tuning the device into the few-electron regime. The outcome of one approach was found to be prone to meta-stability of the charge state of the array, specifically related to the occupancy of quantum dots that were not directly connected to the leads. The mechanism behind this meta-stability is discussed. An alternative approach provides a more efficient method of tuning the device into the few-electron regime while avoiding the meta-stability complication.
- Publication:
-
Applied Physics Letters
- Pub Date:
- October 2016
- DOI:
- 10.1063/1.4966618
- Bibcode:
- 2016ApPhL.109q3108B