Atomic-size metallic conductors.

Area of Science:

• Condensed matter physics
• Quantum mechanics
• Materials science

Background:

• Advancements in experimental techniques and theoretical insights enable atomic-scale investigation of electronic transport properties.
• The field of atomic-scale electronic transport is rapidly evolving with established discoveries and concepts.

Purpose of the Study:

• To review the electronic conductance of a single atom.
• To discuss the theoretical basis and experimental verification of atomic-scale conductance.
• To explore the relationship between electronic conductance and atomic-scale energetics/dynamics.

Main Methods:

• Theoretical modeling of quantum modes determining conductance based on valence orbitals.
• Experimental techniques for probing atomic-scale electronic transport.
• Analysis of energetics and dynamics of atomic-scale configurations.

Main Results:

• Single-atom conductance can be described by quantum modes linked to valence orbitals.
• Spontaneous formation of conducting chains of single gold atoms observed.
• Enhanced stability of alkali metal nanowires at specific 'magic' radii due to conductance mode shell structure.

Conclusions:

• Atomic-scale electronic transport is governed by quantum mechanical principles.
• Experimental and theoretical approaches have successfully elucidated single-atom conductance.
• Atomic-scale energetics and dynamics play a crucial role in the properties of nanoconstrictions.