Binary Atomic Silicon Logic

TL;DR

This paper demonstrates the creation of basic binary logic elements using atomic-scale dangling bonds on silicon surfaces, advancing atomic-scale circuitry with potential for ultra-miniature electronics.

Contribution

It introduces a method to pattern dangling bonds on silicon to form binary electronic components, addressing patterning and stability challenges in atomic-scale circuits.

Findings

Successfully patterned dangling bonds to form binary logic elements

Demonstrated a binary wire and OR gate at atomic scale

Showed electron-based binary encoding on silicon surface

Abstract

It has long been anticipated that the ultimate in miniature circuitry will be crafted of single atoms. Despite many advances made in scanned probe microscopy studies of molecules and atoms on surfaces, challenges with patterning and limited thermal stability have remained. Here we make progress toward those challenges and demonstrate rudimentary circuit elements through the patterning of dangling bonds on a hydrogen terminated silicon surface. Dangling bonds sequester electrons both spatially and energetically in the bulk band gap, circumventing short circuiting by the substrate. We deploy paired dangling bonds occupied by one movable electron to form a binary electronic building block. Inspired by earlier quantum dot-based approaches, binary information is encoded in the electron position allowing demonstration of a binary wire and an OR gate.