Anomalously large g-factor of single atoms adsorbed on a metal substrate

A. A. Khajetoorians; A. T. Costa; B. Chilian; D. L. Mills; J. Wiebe; R. Wiesendanger; S. Lounis

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arxiv 1108.2443 v1 pith:ISF3IMQG submitted 2011-08-11 cond-mat.mes-hall

Anomalously large g-factor of single atoms adsorbed on a metal substrate

B. Chilian , A. A. Khajetoorians , S. Lounis , A. T. Costa , D. L. Mills , J. Wiebe , R. Wiesendanger This is my paper

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keywords magneticadsorbedatomsexcitationfieldg-factoristssurface

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We have performed inelastic scanning tunneling spectroscopy (ISTS) on individual Fe atoms adsorbed on a Ag(111) surface. ISTS reveals a magnetization excitation with a lifetime of about 400 fsec which decreases linearly upon application of a magnetic field. Astoundingly, we find that the g-factor, which characterizes the shift in energy of the excitation in a magnetic field, is g = 3.1 instead of the regular value of 2. This enhancement can be understood when considering the complete electronic structure of both the Ag(111) surface state and the Fe atom, as shown by ab initio calculations of the magnetic susceptibility.

Anomalously large g-factor of single atoms adsorbed on a metal substrate

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