Structure factor in photoemission from valence band

Daimon, Hiroshi; Imada, S.; Nishimoto, Hiroyuki; Suga, S.

doi:10.1016/0368-2048(95)02478-6

Cited by 74 publications

(52 citation statements)

References 7 publications

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“…Such a term is independent of the experimental conditions, such as direction and polarization of the incident light, and reflects instead intrinsic properties of the electronic structure. In fact, the spectral functioñ Aðk; ωÞ, defined on the 1-Fe BZ, can be more directly compared with the intensity distribution Iðk; ωÞ of an ARPES experiment [7]. The presence of a structure factor in Iðk; ωÞ is inherent in the so-called one-step description of the technique [8][9][10], where it remains, nonetheless, implicit.…”

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confidence: 99%

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Consequences of Broken Translational Symmetry inFeSexTe1−x

Moreschini

Lin

et al. 2014

Phys. Rev. Lett.

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We investigate the consequences of broken translational symmetry in the superconductor FeSe x Te 1−x using angle-resolved photoemission spectroscopy. We find that the intensity does not follow the periodicity dictated by the crystal structure, owing to the form of the perturbing potential and the symmetries of the Fe d orbitals. Their interplay leads to substantial differences in the orbital character and spectral features observed at nominally equivalent locations in the reciprocal space. Such differences cannot be accounted for by the usual dipole matrix element effects and are due instead to the structure factor, which must be explicitly considered whenever more than one atom is present in the unit cell.

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confidence: 99%

“…As a consequence, it is almost always neglected at the stage of the data interpretation. To our knowledge, a thorough assessment of its role has been presented, so far, only for the cases of graphite or graphene [7,11,12], LiF [13] and Bi2212 [14].…”

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confidence: 99%

Consequences of Broken Translational Symmetry inFeSexTe1−x

Moreschini

Lin

et al. 2014

Phys. Rev. Lett.

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“…Here, we have performed simulations of spectral weight distribution including matrix-element effects by using the same method described in 22,23 . The simulation method which we apply here has given a good account of the photoemission results on graphite 22 and TaSe 2 23 .…”

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confidence: 99%

“…The simulation method which we apply here has given a good account of the photoemission results on graphite 22 and TaSe 2 23 . Therefore, this is a good starting point to understand the matrix element effect in the present ARPES results, at least qualitatively.…”

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confidence: 99%

Electronlike Fermi surface and remnant(π,0)feature in overdopedLa1.78

et al. 2001

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We have performed an angle-resolved photoemission study of overdoped La1.78Sr0.22CuO4, and have observed sharp nodal quasiparticle peaks in the second Brillouin zone that are comparable to data from Bi2Sr2CaCu2O 8+δ . The data analysis using energy distribution curves, momentum distribution curves and intensity maps all show evidence of an electron-like Fermi surface, which is well explained by band structure calculations. Evidence for many-body effects are also found in the substantial spectral weight remaining below the Fermi level around (π,0), where the band is predicted to lie above EF .PACS numbers: 74.25.Jb, 71.18.+y, 74.72.Dn, 79.60.Bm Studies of low lying excitations and the Fermi surface in the high temperature superconductors by angle resolved photoemission spectroscopy (ARPES) have mostly been focused on Bi 2 Sr 2 CaCu 2 O 8+δ (BSCCO) 1-6 and YBa 2 Cu 3 O 7−y (YBCO) 7 . In these systems, however, additional features derived from complicated crystal structures, such as the Bi-O superstructures in BSCCO and the Cu-O chains in YBCO, have made the analysis rather complicated. In particular, the Bi-O superstructure complicates the interpretation of spectra around (π,0), resulting in the controversy over the Fermi surface geometry 1-6 . La 2−x Sr x CuO 4 (LSCO), by virtue of the absence of these effects and the availability of high quality single crystal samples over the entire doping range, provides the opportunity to advance our understanding of the high temperature superconductors. In the underdoped regime, earlier studies have uncovered the presence of two electronic components 8-10 , a systematic suppression of the spectral weight near (π/2, π/2) (when compared with that of overdoped samples or BSCCO for data taken under the same conditions), and straight Fermi surface segments near (π,0) of width ∼ π/2 11,12 , which have been interpreted as evidence for electronic inhomogeneities. In the overdoped regime, an electronlike Fermi surface was observed in the high-T c superconductors for the first time 8 , but despite this progress, important problems remain. Since ARPES data from underdoped samples are very broad, worries about the sample quality persist. There are also questions about the effects of the photoemission matrix element 13 , which makes it difficult to extract quantitative information about stripe effects on nodal spectral weight by comparing the experiments and theoretical calculations that predict suppression [14][15][16] . We address these important questions by performing a detailed study of overdoped LSCO (x= 0.22) where the stripe effects are expected to be weak, and have the aid of reliable band structure calculations (unlike the case of BSCCO). We performed ARPES in three Brillouin zones (BZ) and performed numerical simulations to investigate the matrix element effects. In the second BZ, using a favorable polarization, we have identified a sharp spectral feature along the diagonal direction in this sample that is comparable to that of BSCCO. This observation demonstrates that the ...

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“…In Fig. 1 (e), the photoelectron intensity inside the second BZ is stronger than that of the first BZ due to the photoemission structure factor (PSF) [11,12]. PSF is a phenomenon caused by the interference effect of photoelectrons emitted from each atom when a unit cell has two or more atoms.…”

Section: Methodsmentioning

confidence: 99%

Atomic-Orbital Analysis of ZrB<sub>2 </sub>Valence-Band by Two-Dimensional Photoelectron Spectroscopy

Horie

Matsui

Daimon

et al. 2015

e-J. Surf. Sci. Nanotech.

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To investigate the electronic state of Zirconium diboride (ZrB2) (0001) clean surface, we measured twodimensional photoelectron intensity angular distribution (PIAD) patterns with a display-type spherical mirror analyzer (DIANA). As a result, we obtained two-dimensional band dispersion cross section patterns of ZrB2. In these patterns, we observed the transition-matrix-element effect of linearly-polarized light excitation. Comparing the experimental data to the calculation results, we concluded that the band at theK point at a binding energy of 3.4 eV consists of B 2pz, Zr 4dyz, and Zr 4dzx orbitals. This suggests that this band is the bonding state between the B layer and the Zr layer. We confirmed that this hybrid orbital, where the d electrons of Zr are donated to the pz orbital of B, makes the Dirac-cone-like band of ZrB2.

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Structure factor in photoemission from valence band

Cited by 74 publications

References 7 publications

Consequences of Broken Translational Symmetry inFeSexTe1−x

Consequences of Broken Translational Symmetry inFeSexTe1−x

Electronlike Fermi surface and remnant(π,0)feature in overdopedLa1.78

Atomic-Orbital Analysis of ZrB<sub>2 </sub>Valence-Band by Two-Dimensional Photoelectron Spectroscopy

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