Journal
PHYSICAL REVIEW B
Volume 82, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.035116
Keywords
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Funding
- NANOSPINTRONICS Cluster of Excellence
- [SFB668]
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The correlated electronic structure of the submonolayer surface systems Sn/Si(111) and Sn/Ge(111) is investigated by density-functional theory and its combination with explicit many-body methods. Namely, the dynamical mean-field theory and the slave-boson mean-field theory are utilized for the study of the intriguing interplay between structure, bonding, and electronic correlation. In this respect, explicit low-energy one-and four (sp(2)-like)-band models are derived using maximally localized Wannier(-type) functions. In view of the possible low-dimensional magnetism in the Sn submonolayers we compare different types of magnetic orders and indeed find a 120 noncollinear ordering to be stable in the ground state. With single-site methods and cellular-cluster extensions the influence of a finite Hubbard U on the surface states in a planar and a reconstructed structural geometry is furthermore elaborated.
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