Point of Contact

Point of Contact

Quantum point contact microscopy.

We introduce quantum point contact microscopy (QPCM) as a novel method for surface characterization, where the conductance through a quantum point contact formed by a metal atom between the tip of a scanning tunneling microscope and the surface is mapped across the surface. Application of QPCM to copper and gold (111) shows reproducibly atomic resolution, on gold (111) the alternating atomic st...

Point-contact Spectroscopy of Superconductors

Resonant multilead point-contact tunneling

We analyze a model of resonant point-contact tunneling between multiple Luttinger-liquid leads. The model is a variant of the multichannel Kondo model and can be related to the quantum Brownian motion of a particle on lattices with p flux through each plaquette ~in the three-lead case, it is a honeycomb lattice with p flux!. By comparing the perturbative and instanton gas expansions, we find a ...

Environmental Worldviews: A Point of Common Contact,

Increasingly, scientists are reaching out to individuals and entities once considered “users” of scientific knowledge to engage them in the research process due to the increased need for contextualized knowledge. However, these increased interactions make apparent the boundaries that exist between the parties interested in sustainability science. Divergent values and attitudes amongst researche...