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Jürg Osterwalder - One of the best experts on this subject based on the ideXlab platform.

  • Rashba-Type Spin-Orbit Splitting of Quantum Well States in Ultrathin Pb Films
    Physical review letters, 2008
    Co-Authors: J. Hugo Dil, Gustav Bihlmayer, Fabian Meier, Jorge Lobo-checa, Luc Patthey, Jürg Osterwalder
    Abstract:

    A Rashba-type Spin-Orbit Splitting is found for quantum well states formed in ultrathin Pb films on Si(111). The resulting momentum Splitting is comparable to what is found for semiconductor heterostructures. The Splitting shows no coverage dependency and the sign of the spin polarization is reversed compared to Rashba Splitting in the Au(111) surface state. We explain our results by competing effects at the two boundaries of the Pb layer.

Gustav Bihlmayer - One of the best experts on this subject based on the ideXlab platform.

  • Quantum-well-induced giant Spin-Orbit Splitting.
    Physical review letters, 2010
    Co-Authors: Stefan Mathias, A. Ruffing, F. Deicke, M. Wiesenmayer, I. Sakar, Gustav Bihlmayer, Eugene V. Chulkov, Yu. M. Koroteev, Pedro M. Echenique, Michael Bauer
    Abstract:

    We report on the observation of a giant Spin-Orbit Splitting of quantum-well states in the unoccupied electronic structure of a Bi monolayer on Cu(111). Up to now, Rashba-type Splittings of this size have been reported exclusively for surface states in a partial band gap. With these quantum-well states we have experimentally identified a second class of states that show a huge Spin-Orbit Splitting. First-principles electronic structure calculations show that the origin of the Spin-Orbit Splitting is due to the perpendicular potential at the surface and interface of the ultrathin Bi film. This finding allows for the direct possibility to tailor Spin-Orbit Splitting by means of thin-film nanofabrication.

  • Rashba-Type Spin-Orbit Splitting of Quantum Well States in Ultrathin Pb Films
    Physical review letters, 2008
    Co-Authors: J. Hugo Dil, Gustav Bihlmayer, Fabian Meier, Jorge Lobo-checa, Luc Patthey, Jürg Osterwalder
    Abstract:

    A Rashba-type Spin-Orbit Splitting is found for quantum well states formed in ultrathin Pb films on Si(111). The resulting momentum Splitting is comparable to what is found for semiconductor heterostructures. The Splitting shows no coverage dependency and the sign of the spin polarization is reversed compared to Rashba Splitting in the Au(111) surface state. We explain our results by competing effects at the two boundaries of the Pb layer.

Jacques Allègre - One of the best experts on this subject based on the ideXlab platform.

  • Effects of finite Spin-Orbit Splitting on optical properties of spherical semiconductor quantum dots.
    Physical Review B: Condensed Matter and Materials Physics, 1996
    Co-Authors: Tristan Richard, Pierre Lefebvre, Henry Mathieu, Jacques Allègre
    Abstract:

    The multiband envelope-function formalism—of which a convenient, analytical formulation is presented—is used to investigate the energies and wave functions of valence-band levels in spherical nanocrystallites of several III-V and II-VI compound semiconductors with finite Spin-Orbit Splitting energy Δ. Interband absorption spectra are deduced. A significant influence of the split-off band is found even in cases where Δ is large, as for CdTe. In fact, Δ is not a decisive criterion for the strength of couplings; Luttinger parameters play a major role. Numerical results are presented for size-distributed crystallites of various binaries (CdTe, CdSe, CdS, GaAs, InP). These are analyzed in terms of the accuracy of measuring the sizes from absorption spectra by using a fitting procedure, and of performing size-selective excitation of photoluminescence. It is also found that optical transitions between the ground valence- and conduction-band levels may be forbidden, due to incompatible symmetries. Calculations neglecting the influence of the split-off band are unable to account for this property, which strongly affects photoluminescence mechanisms.

J. Hugo Dil - One of the best experts on this subject based on the ideXlab platform.

  • Rashba-Type Spin-Orbit Splitting of Quantum Well States in Ultrathin Pb Films
    Physical review letters, 2008
    Co-Authors: J. Hugo Dil, Gustav Bihlmayer, Fabian Meier, Jorge Lobo-checa, Luc Patthey, Jürg Osterwalder
    Abstract:

    A Rashba-type Spin-Orbit Splitting is found for quantum well states formed in ultrathin Pb films on Si(111). The resulting momentum Splitting is comparable to what is found for semiconductor heterostructures. The Splitting shows no coverage dependency and the sign of the spin polarization is reversed compared to Rashba Splitting in the Au(111) surface state. We explain our results by competing effects at the two boundaries of the Pb layer.

Michael Bauer - One of the best experts on this subject based on the ideXlab platform.

  • Quantum-well-induced giant Spin-Orbit Splitting.
    Physical review letters, 2010
    Co-Authors: Stefan Mathias, A. Ruffing, F. Deicke, M. Wiesenmayer, I. Sakar, Gustav Bihlmayer, Eugene V. Chulkov, Yu. M. Koroteev, Pedro M. Echenique, Michael Bauer
    Abstract:

    We report on the observation of a giant Spin-Orbit Splitting of quantum-well states in the unoccupied electronic structure of a Bi monolayer on Cu(111). Up to now, Rashba-type Splittings of this size have been reported exclusively for surface states in a partial band gap. With these quantum-well states we have experimentally identified a second class of states that show a huge Spin-Orbit Splitting. First-principles electronic structure calculations show that the origin of the Spin-Orbit Splitting is due to the perpendicular potential at the surface and interface of the ultrathin Bi film. This finding allows for the direct possibility to tailor Spin-Orbit Splitting by means of thin-film nanofabrication.