Copper is the current interconnect metal of choice in integrated circuits. As interconnect dimensions decrease, the resistivity of copper increases dramatically because of electron scattering from surfaces, impurities, and grain boundaries (GBs) and threatens to ...
The complex interplay between the electron and lattice degrees of freedom produces multiple nearly degenerate electronic states in correlated electron materials. The competition between these degenerate electronic states largely determines the functionalities of the system, ...
We have fabricated an ultrahigh-vacuum-processed, ordered, single-crystalline nanodotarray. By mapping the magnetization of the nanodots with spin polarized scanning tunneling microscopy in the same chamber where they were grown, we are able to understand how the short-range order of the nanodot array is determined by the magnetostatic dipole interaction among ...
The spatially resolved electrical transport properties have been studied on the surface of optimally doped superconducting Ba(Fe1−xCox)2As2 single crystal by using a four-probe scanning tunneling microscopy. While some nonuniform contrast appears near the edge of the cleaved ...
A defect-state mediated conductance blockade effect has been studied in magnetic tunnel junctions consisting of La0.7Sr0.3MnO3 (LSMO) electrodes and a SrTiO3 (STO) barrier. The blockade threshold is an order of magnitude greater than the Coulomb charging ...
A conductance blockade effect has been observed in the magnetic tunnel junction consisting of La0.7Sr0.3MnO3 electrodes and a SrTiO3 barrier. The blockade effect is correlated with the space-charge trap states in the barrier. The blockade threshold eVB = 128 meV is significantly greater than Coulomb charging energy EC = ...
The electrical transport properties of individual carbon nanotubes (CNTs) and multi-terminal junctions of CNTs are investigated with a quadraprobe scanning tunneling microscope. The CNTs used in this study are made of stacked herringbone-type conical graphite ...
Metallic nanowires are of great interest as interconnects in nanoelectronic devices. They also represent important systems for understanding the complexity of electronic interactions and conductivity in one dimension. We have fabricated exceptionally long and uniform ...
We describe the development and the capabilities of an advanced system for nanoscale electrical transport studies. This system consists of a low temperature four-probe scanning tunneling microscope (STM) and a high-resolution scanning electron microscope coupled to a molecular-beam epitaxy sample preparation chamber. The four STM probes can be manipulated ...
The strain-relieving mechanism and local electronic density of states of a wetting film, was studied in the Ag on W system using scanning tunneling microscopy and spectroscopy. In the Ag wetting film, a periodic bright ...
