1106.2853 (A. C. Seridonio et al.)

Non-Zeeman splitting for a spin-resolved STM with a Kondo adatom in a
spin-polarized two-dimensional electron gas    [PDF]

A. C. Seridonio, F. S. Orahcio, F. M. Souza, M. S. Figueira

We theoretically investigate the spin-resolved local density of states
(SR-LDOS) of a spin-polarized two-dimensional electron gas in the presence of a
Kondo adatom and a STM probe. Using Green function formalism and the atomic
approach in the limit of infinite Coulomb correlation, it is found an
analytical SR-LDOS expression in the low temperature regime of the system. This
formal result is given in terms of phase shifts originated by the adatom
scattering and Fano interference. The SR-LDOS is investigated as a function of
the probe position and different Fano factors. Our findings provide an
alternative way to spin-split the Kondo resonance without the use of huge
magnetic fields, typically necessary in adatom systems characterized by large
Kondo temperatures. We observe a non-Zeeman spin-splitting of the Kondo
resonance in the total LDOS, with one spin-component pinned around the host
Fermi level. Interestingly, this result is in accordance to recent experimental
data reported in Phys. Rev. B 82, 020406(R) (2010).

View original: http://arxiv.org/abs/1106.2853