Tuning independently the Fermi energy and spin splitting in Rashba systems: ternary surface alloys on Ag(111)

By detailed first-principles calculations we show that the Fermi energy and the Rashba splitting in disordered ternary surface alloys Bi(x)Pb(y)Sb(1 - x - y)/Ag(111) can be independently tuned by choosing the concentrations x and y of Bi and Pb, respectively. The findings are explained by three fund...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2010-09, Vol.22 (38), p.385501-385501
Main Authors: Mirhosseini, H, Ernst, A, Ostanin, S, Henk, J
Format: Article
Language:English
Subjects:
Alloys
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Fermi surfaces
Joining
Lead (metal)
Level splitting and interactions
Mathematical analysis
Physics
Spin-orbit coupling, zeeman, stark, and strain splitting, jahn-teller effect
Splitting
Tuning
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Summary:By detailed first-principles calculations we show that the Fermi energy and the Rashba splitting in disordered ternary surface alloys Bi(x)Pb(y)Sb(1 - x - y)/Ag(111) can be independently tuned by choosing the concentrations x and y of Bi and Pb, respectively. The findings are explained by three fundamental mechanisms, namely the relaxation of the adatoms, the strength of the atomic spin-orbit coupling, and band filling. By mapping the Rashba characteristics, i.e. the splitting k(R) and the Rashba energy E(R), and the Fermi energy of the surface states in the complete range of concentrations, we find that these quantities depend monotonically on x and y, with a very few exceptions. Our results suggest that we should investigate experimentally effects which rely on the Rashba spin-orbit coupling depending on spin-orbit splitting and band filling.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/22/38/385501