The prominent 5d-orbital contribution to the conduction electrons in gold

Sekiyama, A.; Yamaguchi, Junichi; Higashiya, A.; Obara, M.; Sugiyama, Hiroshi; Kimura, Masato; Suga, S.; Imada, S.; Некрасов, И. А.; Yabashi, Makina; Tamasaku, Kenji; Ishikawa, Tetsuya

doi:10.1088/1367-2630/12/4/043045

Cited by 69 publications

(36 citation statements)

References 31 publications

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“…(4) as a stationary state in a spherical square well of radius D/2. The depth of the spherical square-well potential is assumed to be equal to the sum of the work function (5.1 eV [30]) and conduction-band width (8 eV [31]) of bulk Au. We represent the final state as the exponentially damped "Volkov" continuum wave function [26] …”

Section: T) (4)mentioning

confidence: 99%

Retrieving plasmonic near-field information: A quantum-mechanical model for streaking photoelectron spectroscopy of gold nanospheres

Saydanzad

Thumm

2016

Phys. Rev. A

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Streaked photoemission from nanostructures is characterized by size-and material-dependent nanometer-scale variations of the induced nanoplasmonic response to the electronic field of the streaking pulse and thus holds promise of allowing photoelectron imaging with both subfemtosecond temporal and nanometer spatial resolution. In order to scrutinize the driven collective electronic dynamics in 10-200-nm-diameter gold nanospheres, we calculated the plasmonic field induced by streaking pulses in the infrared and visible spectral range and developed a quantum-mechanical model for streaked photoemission by extreme ultraviolet pulses. Our simulated photoelectron spectra reveal a significant amplitude enhancement and phase shift of the photoelectron streaking trace relative to calculations that exclude the induced plasmonic field. Both are most pronounced for streaking pulses tuned to the plasmon frequency and retrace the plasmonic electromagnetic field enhancement and phase shift near the nanosphere surface. DOI: 10.1103/PhysRevA.94.051401 Recent advances in nanoscience and nanotechnologies are creating new avenues for designing and making nanometerscale metal structures which respond to irradiation with electromagnetic radiation by creating a tunable induced electric field near the metal surface [1,2]. This induced "plasmonic" field originates in the incident-field-driven coherent collective motion of conduction electrons which, when stimulated near its natural resonance (plasmon) frequency, generate a very large induced polarization in subwavelength-size structures on substrate surfaces [3-9] and isolated nanoparticles [10]. Near metallic nanospheres and for linearly polarized incident radiation [10][11][12][13][14][15][16], the oscillating induced polarization gives rise to oscillating plasmonic fields with dipole-like angular distribution oriented along the polarization direction of the incident radiation [17].Strong plasmonic field enhancement effects are linked to the local dielectric properties of the nanostructure and form the underlying physical phenomenon in established surfaceenhanced Raman spectroscopy (SERS) [18] and various prototype and suggested applications, such as attosecond nanoplasmonic-field microscopy [3] and nanoplasmonically enhanced photocatalysis [19] and light harvesting [20]. The detailed understanding of plasmonic excitations in solids requires imaging techniques that resolve their spatiotemporal evolution [3,16]. While ultrafast laser technology is available in many laboratories worldwide, allowing the resolution of various aspects of the electronic dynamics during the infrared (IR)-pulse-streaked extreme ultraviolet (XUV) photoionization of gaseous atoms with a precision of about 10 as [21], a promising emerging line of attosecond science targets the electronic dynamics in solids, biomolecules, and nanostructures [2,22]. These highly time-resolved investigations on solid targets address effects that are absent in isolated atoms in the gas phase, such as the propagation of photoexcite...

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Section: T) (4)mentioning

confidence: 99%

Retrieving plasmonic near-field information: A quantum-mechanical model for streaking photoelectron spectroscopy of gold nanospheres

Saydanzad

Thumm

2016

Phys. Rev. A

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“…Hard X-ray photoemission spectroscopy (HAXPES) is a powerful tool for investigation of the chemical states and electronic structure of various materials [17,18] for example multilayers [19,20,21,22], strongly correlated oxides [23], or magnetic materials especially in combination with variable photon polarisation [24,25,26,27]. X-ray magnetic circular dichroism (XMCD) in X-ray absorption spectroscopy (XAS) is an efficient method for studying the element-specific electronic structure of buried layers [28] using hard (K edges of 3d materials) [29] as well as soft X-rays (L edges of 3d materials) [30] for excitation.…”

Section: Introductionmentioning

confidence: 99%

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Ouardi¹,

Fecher²,

Kubota³

et al. 2015

J. Phys. D: Appl. Phys.

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Abstract.Using circularly polarised radiation and a combination of bulk-sensitive hard X-ray photoelectron spectroscopy and X-ray-absorption spectroscopy (XAS) we studied the electronic and magnetic structure of epitaxial Mn 1.8 Co 1.2 Ga thin films. Spin resolved Bloch spectral functions, density of states as well as charge and magnetisation densities were investigated by a first-principles analysis of full potential, fully relativistic Korringa-Kohn-Rostoker calculations of the electronic structure. The valence states were experimentally investigated by using linear dichroism in the angular distribution and comparing the results to spin-resolved densities of states. The linear dichroism in the valence band enabled a symmetry analysis of the contributing states. The spectra were in good agreement with the theoretical partial density of states. The element-specific, spin-resolved, unoccupied densities of states for Co and Mn were analysed by using XAS and X-ray magnetic circular dichroism (XMCD) at the L 3,2 edges. The spectra were influenced by strong correlation effects. XMCD was used to extract the site resolved magnetic moments. The experimental values of m Mn = 0.7 µ B and m Co = 1.05 µ B agree very well with the calculated magnetic moments. Magnetic circular dichroism in angle-resolved photoelectron spectroscopy at the Mn and Co 2p core level exhibited a pronounced magnetic dichroism and confirmed the localised character of the Mn d valence states.

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“…We have performed LD in HAXPES [28,29] at BL19LXU of SPring-8 [30] using a MBS A1-HE hemispherical photoelectron spectrometer. A Si(111) doublecrystal monochromator selected linearly polarized 7.9 keV radiation within the horizontal plane, which was further monochromatized using a Si(620) channel-cut crystal.…”

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confidence: 99%

Evidence for Γ₈ Ground-State Symmetry of Cubic YbB₁₂ Probed by Linear Dichroism in Core-Level Photoemission

et al. 2015

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We have successfully observed linear dichroism in angle-resolved Yb 3+ 3d 5/2 core-level photoemission spectra for YbB12 in cubic symmetry. Its anisotropic 4f charge distribution due to the crystal-field splitting is responsible for the linear dichroism, which has been verified by spectral simulations using ionic calculations with the full multiplet theory for a single-site Yb 3+ ion in cubic symmetry. The observed linear dichroism as well as the polarization-dependent spectra in two different photoelectron directions for YbB12 are quantitatively reproduced by theoretical analysis for the Γ8 ground state, indicating the Γ8 ground-state symmetry for the Yb 3+ ions mixed with the Yb 2+ state.Rare-earth-based strongly correlated electron systems show various interesting phenomena such as competition between magnetism and unconventional superconductivity, charge and/or multipole ordering, and the formation of a narrow (∼meV) gap at low temperatures. Among them, YbB 12 is known as a Kondo semiconductor [1][2][3][4][5], which has been recently recognized as a candidate for topological insulators [6], as intensively discussed for another Kondo semiconductor, SmB 6 [7-9]. The mean valence of YbB 12 has been estimated as ∼2.9+ by bulksensitive 3d core-level hard X-ray photoemission (HAX-PES) spectroscopy [10]. To discuss the mechanisms of the gap opening at low temperatures [5,[11][12][13][14][15][16] Generally, it is difficult to experimentally determine the 4f ground-state symmetry. Inelastic neutron scattering is useful, but other excitations such as phonon excitations often hamper the observation of magnetic 4f −4f excitations. Linear dichroism (LD) in 3d−to−4f soft Xray absorption spectroscopy (XAS) for single crystals is powerful owing to the dipole selection rules, as reported for Ce compounds [19][20][21][22]. However, it is not applicable to compounds in cubic symmetry, in which there is no anisotropic axis relative to the electric field of the incident light. On the other hand, the selection rules work also in the photoemission process while the excited electron energy is much higher than that in the absorption. Furthermore, there is another controllable measurement parameter in photoemission, called the "photoelectron detection direction" relative to the single-crystalline axis, in addition to the polarization direction of the excitation light. Indeed, by using LD in 3d core-level HAXPES spectra, the Yb 3+ 4f ground state has been determined for tetragonal YbCu 2 Si 2 and YbRh 2 Si 2 [23]. LD in the core-level HAXPES for cubic Yb compounds is also expected to be observed, as discussed below.In the case of Yb 3+ ions in tetragonal symmetry, the eightfold degenerate J = 7/2 state splits into four dou-

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The prominent 5d-orbital contribution to the conduction electrons in gold

Cited by 69 publications

References 31 publications

Retrieving plasmonic near-field information: A quantum-mechanical model for streaking photoelectron spectroscopy of gold nanospheres

Retrieving plasmonic near-field information: A quantum-mechanical model for streaking photoelectron spectroscopy of gold nanospheres

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Evidence for Γ₈ Ground-State Symmetry of Cubic YbB₁₂ Probed by Linear Dichroism in Core-Level Photoemission

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The prominent 5d-orbital contribution to the conduction electrons in gold

Cited by 69 publications

References 31 publications

Retrieving plasmonic near-field information: A quantum-mechanical model for streaking photoelectron spectroscopy of gold nanospheres

Retrieving plasmonic near-field information: A quantum-mechanical model for streaking photoelectron spectroscopy of gold nanospheres

Magnetic dichroism study on Mn1.8Co1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Evidence for Γ8 Ground-State Symmetry of Cubic YbB12 Probed by Linear Dichroism in Core-Level Photoemission

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Product

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Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Evidence for Γ₈ Ground-State Symmetry of Cubic YbB₁₂ Probed by Linear Dichroism in Core-Level Photoemission