Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 99: Electron and spin dynamics II
O 99.4: Vortrag
Freitag, 18. März 2011, 12:00–12:15, WIL B321
Electron dynamics in the Rashba spin-orbit split Bi/Cu(111) quantum-well system — •Andreas Ruffing1, Sebastian Jakobs1, Indranil Sarkar1, Mirko Cinchetti1, Stefan Mathias1,2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2JILA, University of Colorado and NIST, Colorado 80309 0440, USA
Metallic quantum wells (QW) have been studied extensively in the recent past motivated by their potential to tune condensed matter properties via control of the quantum mechanical boundary conditions in these low-dimensional systems. Additional to the tuneability of QW systems, they show interesting features in the electronic structure, such as avoided crossings, band gaps, spin-orbit splitting and modifications due to interaction with the substrate. All these features influence the decay dynamics of excited carriers. We investigated the quantum-well system of one monolayer Bi/Cu(111), which shows a giant spin-orbit splitting of its unoccupied quantum-well bands [1]. We use time- and angle resolved two-photon photoemission to explore the femtosecond electron dynamics in this peculiar two-dimensional band structure. The band structure dependence of the hot-electron lifetimes is discussed by means of femtosecond lifetime maps τ(E, k||) with specific attention to a spin hot-spot at the Γ-Point of the Bi/Cu(111) quantum-well structure.
S.Mathias et al., Phys. Rev. Lett. 104, 066802 (2010)