7 research outputs found
Simulating Charged Defects in Silicon Dangling Bond Logic Systems to Evaluate Logic Robustness
Recent research interest in emerging logic systems based on quantum dots has
been sparked by the experimental demonstration of nanometer-scale logic devices
composed of atomically sized quantum dots made of silicon dangling bonds
(SiDBs), along with the availability of SiQAD, a computer-aided design tool
designed for this technology. Latest design automation frameworks have enabled
the synthesis of SiDB circuits that reach the size of
-- orders of magnitude more complex than their
hand-designed counterparts. However, current SiDB simulation engines do not
take defects into account, which is important to consider for these sizable
systems. This work proposes a formulation for incorporating fixed-charge
simulation into established ground state models to cover an important class of
defects that has a non-negligible effect on nearby SiDBs at the
scale and beyond. The formulation is validated by implementing it into SiQAD's
simulation engine and computationally reproducing experiments on multiple
defect types, revealing a high level of accuracy. The new capability is applied
towards studying the tolerance of several established logic gates against the
introduction of a single nearby defect to establish the corresponding minimum
required clearance. These findings are compared against existing metrics to
form a foundation for logic robustness studies.Comment: 7 pages, 5 figures, 2 table