On the band structure of silver and platinum from angle-resolved photoelectron spectroscopy (ARUPS) measurements

Wern, H.; Courths, R.; Leschik, G.; Hüfner, S.

doi:10.1007/bf01304449

Cited by 73 publications

(22 citation statements)

References 59 publications

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“…1(b). The results can be compared despite the fact that they were obtained for photon energies differing by 1 eV, since the calculation neglects a self-energy correction of about the same magnitude (0.75 eV, see Wern et al 16 ). While we find good qualitative agreement for the total intensities (a convolution of the calculated spectra with the experimental resolution of 250 meV will mainly broaden peak 1), the polarization values in peak 1 and peak 2 are in excellent agreement with the theoretical results.…”

Section: Experimental Verification Of a New Spin-polarization Effect mentioning

confidence: 98%

Experimental verification of a new spin-polarization effect in photoemission: Polarized photoelectrons from Pt(111) with linearly polarized radiation in normal incidence and normal emission

1988

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A theoretical prediction of a new spin effect by Tamura, Piepke, and Feder has been experimentally verified: Photoelectrons can be polarized even if the photoemission is performed with linearly polarized radiation and even if it is studied in the highly symmetrical setup of normal incidence and normal emission. Radiation with energies between 21 and 22.4 eV ejects photoelectrons from Pt(l 11) with a degree of polarization between 10% and 40%. The spin direction coincides with a plane parallel to the surface and changes its sign when the crystal is rotated by 60° about the surface normal.PACS numbers: 79.60.Cn, 71.25.PiThe existence of spin-polarized photoelectrons obtained with circularly polarized radiation from unpolarized targets (free atoms, molecules, adsorbates, and nonferromagnetic solids) has been proved to be a common phenomenon rather than exceptional. 1 The spinpolarization information is an important tool to characterize the symmetry of the states and bands involved, i.e., to perform a symmetry-resolved band mapping of solids or a characterization of quantum numbers, dipole matrix elements, or phase-shift differences of wave functions in the photoionization of free or adsorbed atoms. XylThat linearly or even unpolarized radiation is able to eject polarized electrons in photoemission of ferromagnetic solids, 3 in which the photoelectron polarization is primarily an effect of the initial states, is well known. In photoionization of free unpolarized atoms and molecules 4 or in photoemission of nonferromagnetic solids 5 it has been found in angle-resolved off-normal photoelectron emission as a final-state effect; in these cases it is a consequence of a quantum-mechanical interference between different photoelectron partial waves in atomic photoionization, 6 or due to spin-dependent photoelectron diffraction or phase-matching conditions at the solidvacuum interface in photoemission. 7 In spin-resolved photoemission from noncentrosymmetric crystals spin polarization can arise from difference in spin-up and spin-down conduction-band hydridization with valence p states and from surface-transmission effects. 8 Normal incidence of linearly polarized light along centrosymmetric cubic crystals and normal photoelectron emission was, however, commonly assumed to yield no spin polarization at all. 7 ' 9 Very recently, Tamura, Piepke, and Feder 10 refuted this belief and predicted normal-emission photoelectron spin polarization by linearly polarized light for (111) surfaces of centrosymmetric cubic crystals. Their prediction is based upon a one-step photoemission theory using a relativistic multiple-scattering formalism and they identify the spin-orbit interaction in the half-space initial states as its main cause. In general, symmetry arguments show that for this special geometry electron spin polarization P can be nonzero. Because of the invariance of the total system (semi-infinite crystal with surface, incident light, electron detection direction) under a symmetry operation, photoelectrons can only be polarized p...

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Section: Experimental Verification Of a New Spin-polarization Effect mentioning

confidence: 98%

Experimental verification of a new spin-polarization effect in photoemission: Polarized photoelectrons from Pt(111) with linearly polarized radiation in normal incidence and normal emission

1988

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“…3 Table I. Subsequent columns of Table I list measured values from photoemission for the onset of a nearly-free-electron (NFE) band in the substrate 30,31,32,33 (as further discussed in Section III), our measured values for the work function difference  between the bare metal surface (an oxidized Cu surface in the present case) and the graphene-covered surface, measured values for the work function of the bare metal surface M  from the literature, 34,35,36,37 and the difference    M which corresponds to an experimental value for the work function of graphene on the metal surface.…”

Section: A Cu(001)mentioning

confidence: 99%

Low-energy electron reflectivity of graphene on copper and other substrates

Srivastava¹,

Gao²,

Widom³

et al. 2013

Phys. Rev. B

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The reflectivity of low energy electrons from graphene on copper substrates is studied both experimentally and theoretically. Well-known oscillations in the reflectivity of electrons with energies 0 -8 eV above the vacuum level are observed in the experiment. These oscillations are reproduced in theory, based on a first-principles density functional description of interlayer states forming for various thicknesses of multilayer graphene. It is demonstrated that n layers of graphene produce a regular series of 1  n minima in the reflectance spectra, together with a possible additional minimum associated with an interlayer state forming between the graphene and the substrate. Both (111) and (001) orientations of the copper substrates are studied. Similarities in their reflectivity spectra arise from the interlayer states, whereas differences are found because of the different Cu band structures along those orientations. Results for graphene on other substrates, including Pt(111) and Ir(111), are also discussed.

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“…It is remarkable that the peaks J and C are of comparable intensity. On the basis of intensity calculations for normal photoemission from Ag(lll) (33) and Au(lll) [34), the transition J should not be measurable due to a vanishing surface transmission factor.…”

Section: Spin-resolved Photoemission From Ir(lll)mentioning

confidence: 99%

Spin-resolved photoemission from Ir(111): Transitions into a secondary band and energetic position of the final state bands

Müller

Keßler

Schmiedeskamp

et al. 1987

Solid State Communications

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Spin resolved photoelectron spectroscopy with Ir(lll) was performed in normal incidence of circularly polarized VUV radiation and normal electron emission. Using the spin information the spectra were separated with regard to the symmetry of the initial states. Besides the dominant transitions into the free electron like parts of the unoccupied bands, transitions into a secondary unoccupied band were unambiguously identified. Transitions into this secondary band cannot be evidenced without spin analysis. The data are in excellent agreement with a fully relativistic first-principles band structure calculation of Noffke and Fritsche, except for an overall shift of AE = 0.8 eV ±0.3 eV for the energy of the unoccupied final bands.

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On the band structure of silver and platinum from angle-resolved photoelectron spectroscopy (ARUPS) measurements

Cited by 73 publications

References 59 publications

Experimental verification of a new spin-polarization effect in photoemission: Polarized photoelectrons from Pt(111) with linearly polarized radiation in normal incidence and normal emission

Experimental verification of a new spin-polarization effect in photoemission: Polarized photoelectrons from Pt(111) with linearly polarized radiation in normal incidence and normal emission

Low-energy electron reflectivity of graphene on copper and other substrates

Spin-resolved photoemission from Ir(111): Transitions into a secondary band and energetic position of the final state bands

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