Condensed Matter Physics Seminar
Thursday, February 3, 2000, 2 p.m.
Plant Sciences Building, Room 1130
(IBM Almaden Research Center)
Abstract: While the correlated electron physics underlying
the diverse manifestations of magnetism and spin have long been studied
via macroscopic behavior, only recently have novel local probes opened
the door to a new class of studies on the nanometer length scale.
On top of these technological advances, the advent of controlled atomic
and molecular manipulation provides a unique opportunity not only to detect
spin phenomena at atomic length scales, but to manipulate spins as well.
This talk will detail new results that exploit these techniques using low-temperature
scanning tunneling microscopy. We have directly imaged the electronic
perturbation arising from the spin-compensation cloud formed around isolated
magnetic moments on a metal surface. Utilizing the detection of this
many-body state--known as the Kondo resonance--in a type of teleportation
experiment, we demonstrate that the spectroscopic signature of an atom
may be sampled and projected to a remote location by means of a surrounding
two-dimensional electron gas confined in an engineered nanostructure.
The "quantum mirage" thus cast by a single magnetic atom can be coherently
refocused at a distinct point where it is detected as a phantom atom around
which the electronic structure mimics that at the real atom. Once
materialized, this phantom can interact with real matter in intriguing
Host: Ellen Williams
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