Abstract
This work combines an atomistic electronic structure simulation with many-electron transport method to investigate the current-voltage (IV) characteristics of Double Quantum Dot (DQD) system in the spin-blockade regime [1]. This work is the combination of a two-fold effort: a) A NEMO 3-D [2] based, atomistic simulation of the geometry of the experimental setup (fig. 1a) to obtain its single electron eigen states, followed by the b) evaluation of I-V characteristics based on the many-electron spectrum of the DQD system, derived from this one-particle set. The many-electron spectrum of this structure is evaluated using a novel subspace reduction technique within the exact-diagonalization scheme. The calculated I-V characteristics from the many-electron spectrum closely resemble the experimental trends (fig. 2). The many-body transport scheme developed here is general and can be easily extended to QD systems with multiple levels, while maintaining similar computational complexity.
Date of this Version
October 2007
Comments
Proceedings of the 12th International Workshop on Computational Electronics, University of Massachusetts, Amherst.