title: Single-atom based coherent quantum interference device structure.
abstract: We describe the fabrication, operation principles, and simulation of a coherent single-atom quantum interference device (QID) structure on Si(100) controlled by the properties of single atoms. The energy and spatial distribution of the wave functions associated with the device are visualized by scanning tunneling spectroscopy and the amplitude and phase of the evanescent wave functions that couple into the quantum well states are directly measured, including the action of an electrostatic gate. Density functional theory simulations were employed to simulate the electronic structure of the device structure, which is in excellent agreement with the measurements. Simulations of device transmission demonstrate that our coherent single-atom QID can have ON-OFF ratios in excess of 10(3) with potentially minimal power dissipation.
authors.affiliation: †School of Chemistry, ‡School of Physics, and §Center for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, Dublin 2, Ireland.
authors.forename: Borislav
authors.initials: B
authors.lastname: Naydenov
authors.affiliation: †School of Chemistry, ‡School of Physics, and §Center for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, Dublin 2, Ireland.
authors.forename: Ivan
authors.initials: I
authors.lastname: Rungger
authors.affiliation: †School of Chemistry, ‡School of Physics, and §Center for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, Dublin 2, Ireland.
authors.forename: Mauro
authors.initials: M
authors.lastname: Mantega
authors.affiliation: †School of Chemistry, ‡School of Physics, and §Center for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, Dublin 2, Ireland.
authors.forename: Stefano
authors.initials: S
authors.lastname: Sanvito
authors.affiliation: †School of Chemistry, ‡School of Physics, and §Center for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, Dublin 2, Ireland.
authors.forename: John J
authors.initials: JJ
authors.lastname: Boland
mesh_terms: D004581:Electronics / Q000379:methods*; D036103:Nanotechnology; D011789:Quantum Theory; D012825:Silicon / Q000737:chemistry*
chemical_list: D012825:Silicon
keywords: DFT; Quantum confinement; Si(100); nanodevice; scanning tunneling spectroscopy (STS)