We demonstrate that it is possible to tune the Rashba energy, introduced by a strong spin-orbit splitting, and the Fermi energy in a two-dimensional electron gas by a controlled change of stoichiometry in an artificial surface alloy. In the BixPb1−x∕Ag(111) surface alloy, the spin-orbit interaction maintains a dramatic influence on the band dispersion for arbitrary Bi concentration x, as is shown by angle-resolved photoelectron spectroscopy. The Rashba energy ER and the Fermi energy EF can be tuned to achieve values larger than one for the ratio ER∕EF, which opens up the possibility for observing phenomena, such as corrections to the Fermi liquid or a superconducting state. Relativistic first-principles calculations explain the experimental findings.
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Titolo: | “Spin-orbit split two-dimensional electron gas with tunable Rashba and Fermi energy” |
Autori: | |
Data di pubblicazione: | 2008 |
Rivista: | |
Handle: | http://hdl.handle.net/20.500.11770/129502 |
Appare nelle tipologie: | 1.1 Articolo in rivista |