High-efficiency retarding-potential Mott polarization analyzer

Burnett, Gregory C.; Monroe, T. J.; Dunning, F. B.

doi:10.1063/1.1144839

Cited by 119 publications

(59 citation statements)

References 23 publications

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“…The fourth harmonic of a homemade fs laser with central wavelength λ ¼ 800 nm and a pulse duration of about 150 fs is used to create circularly polarized light of 6-eV photon energy. Spin analysis of the photoelectrons is provided by a Rice University Mott-type spin polarimeter [29] coupled to a Scienta R8000 hemispherical analyzer. The energy resolution of the SR-ARPES experiment is about 80 meV, and the angular resolution is 0.8° [23].…”

Section: Methodsmentioning

confidence: 99%

Photoemission ofBi2Se3with Circularly Polarized Light: Probe of Spin Polarization or Means for Spin Manipulation?

et al. 2014

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Topological insulators are characterized by Dirac-cone surface states with electron spins locked perpendicular to their linear momenta. Recent theoretical and experimental work implied that this specific spin texture should enable control of photoelectron spins by circularly polarized light. However, these reports questioned the so far accepted interpretation of spin-resolved photoelectron spectroscopy. We solve this puzzle and show that vacuum ultraviolet photons (50-70 eV) with linear or circular polarization indeed probe the initial-state spin texture of Bi 2 Se 3 while circularly polarized 6-eV low-energy photons flip the electron spins out of plane and reverse their spin polarization, with its sign determined by the light helicity. Our photoemission calculations, taking into account the interplay between the varying probing depth, dipole-selection rules, and spin-dependent scattering effects involving initial and final states, explain these findings and reveal proper conditions for light-induced spin manipulation. Our results pave the way for future applications of topological insulators in optospintronic devices.

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Section: Methodsmentioning

confidence: 99%

Photoemission ofBi2Se3with Circularly Polarized Light: Probe of Spin Polarization or Means for Spin Manipulation?

et al. 2014

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“…For spin analysis, a Rice University Mott-type spin polarimeter has been operated at 26 kV. 46 The angular resolution of the spin-resolved experiment is better than 1 • and the average energy resolution about 80 meV. The Fe(110), Co(0001), and Ni(111) surfaces were prepared by epitaxial growth of 20 monolayer (ML) films on W(110) by evaporation from high purity wires using electron bombardment.…”

Section: Methodsmentioning

confidence: 99%

Effects of spin-dependent quasiparticle renormalization in Fe, Co, and Ni photoemission spectra:An experimental and theoretical study

Sánchez-Barriga

Braun²,

Minář³

et al. 2012

Phys. Rev. B

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We have investigated the spin-dependent quasiparticle lifetimes and the strength of electron correlation effects in the ferromagnetic 3d transition metals Fe, Co, and Ni by means of spin-and angle-resolved photoemission spectroscopy. The experimental data are accompanied by state-of-the-art many-body calculations within the dynamical mean-field theory and the three-body scattering approximation, including fully relativistic calculations of the photoemission process within the one-step model. Our quantitative analysis reveals that inclusion of local many-body Coulomb interactions are of ultimate importance for a realistic description of correlation effects in ferromagnetic 3d transition metals. However, we found that more sophisticated many-body calculations with larger modifications in the case of Fe and Co are still needed to improve the quantitative agreement between experiment and theory. In general, it turned out that not only the dispersion behavior of energetic structures should be affected by nonlocal correlations but also the line widths of most of the photoemission peaks are underestimated by the current theoretical approaches. The increasing values of the on-site Coulomb interaction parameter U and the band narrowing of majority spin states obtained when moving from Fe to Ni indicate that the effect of nonlocal correlations becomes weaker with increasing atomic number, whereas correlation effects tend to be stronger.

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“…The spin polarization of the emitted low-energy secondary electrons is determined with a 25 keV retarding-field Mott detector based on the Rice design. [31,32] A thin gold foil is used as scatter target. Electron gun and spin polarization detector enclose an angle of 70 • .…”

Section: Methodsmentioning

confidence: 99%