Spin-dependent reflection of very-low-energy electrons from W(110)

Samarin, Sergey; Williams, James; Sergeant, Anthony; Artamonov, O.M.; Gollisch, H.; Feder, R.

doi:10.1103/physrevb.76.125402

Cited by 21 publications

(11 citation statements)

References 31 publications

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“…LEED spectra calculated using this V im were found to agree well with experiment in Ref. 18. Further LEED calculations, which we performed in the course of the present work, yielded good agreement with earlier experimental data.…”

Section: Formalism and Modelsupporting

confidence: 87%

“…16,17 The surface-potential barrier is represented by a continuous form with image-potential asymptotic behavior, which is described in detail in Ref. 18. It involves two parameters: the image plane position z 1 and the matching plane position z 2 > z 1 > 0 above the topmost internuclear plane at z = 0.…”

Section: Formalism and Modelmentioning

confidence: 99%

“…For the LEED-type electrons, we used it with the parameters determined by the LEED study in Ref. 18: z 1 = 1.8 Bohr and z 2 = 3.6 Bohr. For the valence electrons, we chose the barrier parameters z 1 = 2.945 Bohr and z 2 = 5.890 Bohr such that the surface resonance at the SBZ center is at 1.25 eV below the Fermi energy, in agreement with experimental data.…”

Section: Formalism and Modelmentioning

confidence: 99%

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Electron pair emission from W(110): Response to a spin-polarized surface state

2013

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Details of a spin-polarized surface state on W(110) with a Dirac-cone-like dispersion are revealed by calculations of the spin-and layer-resolved density of states. After collisions of spin-polarized low-energy electrons, which impinge on the surface, with the surface-state electrons, correlated electron pairs are emitted, which have either parallel or antiparallel spins. Calculations of the corresponding reaction cross sections demonstrate, first, a spin-resolved mapping of the surface-state dispersion with surface-parallel momentum. Second, momentum distributions of the outgoing electron pairs with parallel and antiparallel spins allow a separation of Coulomb correlation and exchange effects.

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Section: Formalism and Modelsupporting

confidence: 87%

Section: Formalism and Modelmentioning

confidence: 99%

Section: Formalism and Modelmentioning

confidence: 99%

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Electron pair emission from W(110): Response to a spin-polarized surface state

2013

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“…Details of the final state wave function are seen to have a major effect on the spin photocurrent even when spin-dependent scattering of the outgoing photoelectron does not lead to a spin polarization, that is when spin-orbit coupling in the final state is neglected. The latter effect -spin rotation in the course of propagation [49] -is known, both experimentally and theoretically, to be appreciable at kinetic energies of a few eV, but at small angles it rapidly vanishes at higher energies [50]. By contrast, the modulated photoelectron spin polarization observed in this work reflects the intrinsic spin properties of the probed state, namely its spatially varying spin density, which is sampled differently depending on the shape of the final-state wave function.…”

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confidence: 45%

Strong Linear Dichroism in Spin-Polarized Photoemission from Spin-Orbit-Coupled Surface States

et al. 2017

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A comprehensive understanding of spin-polarized photoemission is crucial for accessing the electronic structure of spin-orbit coupled materials. Yet, the impact of the final state in the photoemission process on the photoelectron spin has been difficult to assess in these systems. We present experiments for the spin-orbit split states in a Bi-Ag surface alloy showing that the alteration of the final state with energy may cause a complete reversal of the photoelectron spin polarization. We explain the effect on the basis of ab initio one-step photoemission theory and describe how it originates from linear dichroism in the angular distribution of photoelectrons. Our analysis shows that the modulated photoelectron spin polarization reflects the intrinsic spin density of the surface state being sampled differently depending on the final state, and it indicates linear dichroism as a natural probe of spin-orbit coupling at surfaces.The creation and manipulation of spin-polarized electronic states in crystalline solids, low-dimensional systems, and heterostructures through strong spin-orbit interaction is a central topic in contemporary condensed matter physics [1][2][3][4][5]. Among the most vivid examples are the surface states of topological insulators in which the coupling of the spin and momentum degrees of freedom gives rise to helical spin textures in momentum space [6]. Moreover, spin-orbit split band structures, in general, attract attention in a broad range of materials, including Weyl semimetals [7], with unconventional spin-polarized states in the bulk and at the surface, stronglycorrelated topological Kondo insulators [8,9], as well as twodimensional systems, such as metallic oxide interfaces [5] and transition-metal dichalcogenide layers [3]. Thus, given the tremendous interest in spin-orbit coupled materials, it is of critical importance to probe their electronic structure with spin sensitivity and to reliably verify the anticipated spin dependences, see, e.g., Refs. [10-13].The most versatile tool to spectroscopically address the momentum-dependent spin polarization of electronic band structures in condensed matter physics has been spin-and angle-resolved photoemission spectroscopy (spin-ARPES). In recent years it has been successfully applied to a variety of materials [14][15][16]. At the same time, the efficiency of stateof-the-art photoelectron spin detectors has been improved tremendously [11,16,17], making it now possible to measure the photoelectron spin polarization over wide regions of momentum space with varying energy and polarization of the exciting light. Despite these encouraging developments fundamental issues remain debated, namely to which degree, under which conditions, and in which way the measured photoelectron spin polarization actually reflects the intrinsic spin properties of spin-orbit split states [11,[18][19][20][21][22][23][24][25][26].Within the one-step theory of photoemission the spindependent photocurrent is determined by the photoemission matrix element which involves the ...

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“…These unequal asymmetries at 22 eV and at 18 eV kinetic energy may indicate that plasmon excitation in this case occurs predominantly before scattering back. This conclusion stems from the previously studied energy dependence of the asymmetry of elastic scattering of the (00) beam from W(110) 47 where the asymmetry at 18 eV was about twice larger than at 22 eV. One should understand, of course, that the Ag/W interface has different scattering properties compared to the vacuum/W interface in terms of the shape of the potential barrier and multiple scattering conditions.…”

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confidence: 91%

Excitation of plasmons in Ag/Fe/W structure by spin-polarized electrons

Samarin

Artamonov

Baraban

et al. 2015

Applied Physics Letters

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Using Spin-polarized Electron-Energy Loss Spectroscopy (SPEELS), the plasmon excitations were probed in a few atomic layers thick Ag film deposited on an Fe layer or on a single crystal of W(110). The measurements were performed at two specular geometries with either a 25 or 72 angle of incidence. On a clean Fe layer (10 atomic layers thick), Stoner excitation asymmetry was observed, as expected. Deposition of a silver film on top of the Fe layer dramatically changed the asymmetry of the SPEELS spectra. The spin-effect depends on the kinematics of the scattering: angles of incidence and detection. The spin-dependence of the plasmon excitations in the silver film on the W(110) surface and on the ferromagnetic Fe film is suggested to arise from the spinactive Ag/W or Ag/Fe interfaces. V

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Spin-dependent reflection of very-low-energy electrons from W(110)

Cited by 21 publications

References 31 publications

Electron pair emission from W(110): Response to a spin-polarized surface state

Electron pair emission from W(110): Response to a spin-polarized surface state

Strong Linear Dichroism in Spin-Polarized Photoemission from Spin-Orbit-Coupled Surface States

Excitation of plasmons in Ag/Fe/W structure by spin-polarized electrons

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