Momentum resolution in inverse photoemission

Zumbülte, A.; Schmidt, Anke B.; Donath, M.

doi:10.1063/1.4906508

Cited by 18 publications

(5 citation statements)

References 55 publications

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“…5(d) shows the surface resonance (SR) and the bulk states labeled as B1 and B2. The spectra are in qualitative agreement with earlier studies [58][59][60] though with lower signal/noise ratio. The E(k) dispersion extracted from Fig.…”

Section: B Spin Polarization Resolutionsupporting

confidence: 91%

“…The spin asymmetry there from the down-to-up intensity ratio at k ↓ F /k ↑ F is ∼ 1.6. Since Zumbülte et al 59 demonstrated that the intensity ratio between k ↑ F and k ↓ F is proportional to the electron beam divergence, in our case we have an angular divergence of ∆θ = ±3.0 • . The angular divergence can be also estimated by considering the spot diameter at the decelerator lens (410 µm) and at the sample, having ∆θ = ±2.3 • .…”

Section: Wavevector Resolutionmentioning

confidence: 52%

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Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle

Campos

Duret

Cabaret

et al. 2022

Review of Scientific Instruments

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A new spin- and angle-resolved inverse photoemission setup with a low-energy electron source is presented. The spin-polarized electron source, with a compact design, can decouple the spin polarization vector from the electron beam propagation vector, allowing one to explore any spin orientation at any wavevector in angle-resolved inverse photoemission. The beam polarization can be tuned to any preferred direction with a shielded electron optical system, preserving the parallel beam condition. We demonstrate the performances of the setup by measurements on Cu(001) and Au(111). We estimate the energy resolution of the overall system at room temperature to be ∼170 meV from k B T eff of a Cu(001) Fermi level, allowing a direct comparison to photoemission. The spin-resolved operation of the setup has been demonstrated by measuring the Rashba splitting of the Au(111) Shockley surface state. The effective polarization of the electron beam is P = 30% ± 3%, and the wavevector resolution is Δ k F ≲ 0.06 Å−1. Measurements on the Au(111) surface state demonstrate how the electron beam polarization direction can be tuned in the three spatial dimensions. The maximum of the spin asymmetry is reached when the electron beam polarization is aligned with the in-plane spin polarization of the Au(111) surface state.

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Section: B Spin Polarization Resolutionsupporting

confidence: 91%

Section: Wavevector Resolutionmentioning

confidence: 52%

Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle

Campos

Duret

Cabaret

et al. 2022

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…The detector has a Sherman function of S = 0.24 [30]. For spin-resolved IPE, we use a spin-polarized electron source, which provides an electron beam of 3 mm diameter with a spin polarization of P = 0.29 [33] and a beam divergence of about ±2 • [34]. For non-normal electron incidence on the sample, our setup is sensitive to the out-of-plane spin component [33].…”

Section: Fig 1 (A)mentioning

confidence: 99%

Spin Structure of K Valleys in Single-Layer WS2 on Au(111)

et al. 2018

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The spin structure of the valence and conduction bands at the K and K' valleys of single-layer WS2 on Au(111) is determined by spin-and angle-resolved photoemission and inverse photoemission. The bands confining the direct band gap of 1.98 eV are out-of-plane spin polarized with spin-dependent energy splittings of 417 meV in the valence band and 16 meV in the conduction band. The sequence of the spin-split bands is the same in the valence and in the conduction bands and opposite at the K and the K' high-symmetry points. The first observation explains "dark" excitons discussed in optical experiments, the latter points to coupled spin and valley physics in electron transport. The experimentally observed band dispersions are discussed along with band structure calculations for a freestanding single layer and for a single layer on Au(111).

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“…counter at E = 9.8 eV [44]. The overall IPE energy resolution was 350 meV and the angular resolution ±2 • [45].…”

Section: Discussionmentioning

confidence: 99%

Visualizing the multifractal wavefunctions of a disordered two-dimensional electron gas

Jäck,

Zinser,

onig

et al. 2020

Preprint

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The wavefunctions of a disordered two-dimensional electron gas at the quantum-critical Anderson transition are predicted to exhibit multifractal scaling in their real space amplitude. We experimentally investigate the appearance of these characteristics in the spatially resolved local density of states of the 2D mixed surface alloy BixPb (1−x) /Ag(111), by combining high-resolution scanning tunneling microscopy with spin-and angleresolved inverse-photoemission experiments. Our detailed knowledge of the surface alloy's electronic band structure, the exact lattice structure and the atomically resolved local density of states enables us to construct a realistic Anderson tight binding model of the mixed surface alloy, and to directly compare the measured local density of states characteristics with those from our model calculations. The statistical analyses of these two-dimensional local density of states maps reveal their log-normal distributions and multifractal scaling characteristics of the underlying wavefunctions with a finite anomalous scaling exponent. Finally, our experimental results confirm theoretical predictions of an exact scaling symmetry for Anderson quantum phase transitions in the Wigner-Dyson classes.

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Momentum resolution in inverse photoemission

Cited by 18 publications

References 55 publications

Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle

Spin- and angle-resolved inverse photoemission setup with spin orientation independent from electron incidence angle

Spin Structure of K Valleys in Single-Layer WS2 on Au(111)

Visualizing the multifractal wavefunctions of a disordered two-dimensional electron gas

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