Schedule Sep 7, 2001
Quantum Mirages
Dr. Don Eigler, IBM, Almaden Research Center
The response of a uniform electron gas to a localized perturbation has long been a unifying theme in condensed matter physics. A common feature of this response is that it generally decays or oscillates within a decaying envelope with greater distance from the source perturbation. We have discovered a new response, called a "Quantum Mirage", in which the effect of a single perturbing atom is refocused and made to be large again at distances far from the atom. I will discuss the experiments in which we have observed the mirage, the physical principles on which the mirage is based, the possible applications of the mirage and the outstanding questions concerning the underlying physics.

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