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Low-temperature scanning tunneling spectroscopy:: Kondo effect and surface state lifetimes

✍ Scribed by Wolf-Dieter Schneider; Richard Berndt

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
569 KB
Volume
109
Category
Article
ISSN
0368-2048

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✦ Synopsis

The present review focuses on a local view of two important phenomena in condensed matter physics, the lifetime of electrons in surface states on noble metals and the scattering of conduction electrons at magnetic impurities: the Kondo effect. Spectroscopic signatures of both effects have been observed in the past by high-resolution photoemission which, 2 however, has the drawback of averaging over a typical surface area of 1 mm . By combining the atomic-scale spatial resolution of the scanning tunneling microscope (STM) with millielectron-volt energy resolution achievable in scanning tunneling spectroscopy (STS) the gap between predicted and measured surface state lifetimes has been closed and our understanding of the interaction of a single magnetic impurity with the conduction electrons of the non-magnetic host has been deepened.

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