Spin polarized photoelectrons with unpolarized light in normal emission from Pt(110)

Irmer, N.; Frentzen, F.; Schmiedeskamp, B.; Heinzmann, Ulrich

doi:10.1016/0039-6028(94)91549-0

Cited by 18 publications

(14 citation statements)

References 14 publications

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“…This effect is due to spin-orbit coupling between states with 3 and 4 spatial symmetry. It was recently verified by experiment (Irmer et al 1995). Now consider light of arbitrary polarization incident on a magnetic semi-infinite system with magnetization M .…”

Section: The Connection Between Magnetic Dichroism and Nonmagnetic Sp...mentioning

confidence: 79%

Magnetic dichroism and electron spin polarization in photoemission: analytical results

Henk

Scheunemann

Halilov

et al. 1996

J. Phys.: Condens. Matter

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For cubic (001), ( 110) and ( 111) surface systems with in-plane or perpendicular magnetization, valence-band photoemission along the surface normal is studied analytically by evaluating electric dipole transition matrix elements between half-space initial and final states of the appropriate double-group symmetry. Explicit expressions are obtained for the spin-polarization vector of the photoelectrons, and the spin-averaged intensity and its change upon reversal of the magnetization direction, i.e. magnetic dichroism, for circularly and linearly polarized incident light. These results firstly elucidate the origin of spin polarization and dichroism in terms of an interplay between spin-orbit coupling and exchange, and secondly provide a systematic overview of possible effects. In particular, we predict new types of magnetic linear dichroism for s-polarized light in the case of magnetization perpendicular to surfaces with a twofold rotation axis and in the case of in-plane magnetization of fcc (111) or hcp (0001) surfaces.

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Section: The Connection Between Magnetic Dichroism and Nonmagnetic Sp...mentioning

confidence: 79%

Magnetic dichroism and electron spin polarization in photoemission: analytical results

Henk

Scheunemann

Halilov

et al. 1996

J. Phys.: Condens. Matter

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“…SMEs in the solid state are not confined to core levels, and have been predicted [42][43][44][45] and subsequently observed [46][47][48][49][50][51] in various related forms in the valence bands of Pt and Au single crystals. As seen in various Rashba-Bychkov spin-split surface states [52][53][54], TRS in these systems requires that any intrinsic spin polarization of quasiparticles, P qp , must be antisymmetric with respect to k = 0, where k is the quasiparticle in-plane crystal momentum.…”

Section: Resultsmentioning

confidence: 99%

“…This ensures zero net spin imbalance integrated over all k-space and that P qp ( k = 0) = 0. In each of these cases [46][47][48][49][50][51], however, normal emission ( k = 0) photoelectrons from valence bands were found to be significantly spin polarized (∼ 10 -20%) dependent on the photon energy and polarization. These effects were explained in terms of SMEs.…”

Section: Resultsmentioning

confidence: 99%

Widespread spin polarization effects in photoemission from topological insulators

et al. 2011

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High resolution spin-and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the three-dimensional topological insulator Bi2Se3 using a recently developed highefficiency spectrometer. The topological surface state's helical spin structure is observed, in agreement with theoretical prediction. Spin textures of both chiralities, at energies above and below the Dirac point, are observed, and the spin structure is found to persist at room temperature. The measurements reveal additional unexpected spin polarization effects, which also originate from the spin-orbit interaction, but are well differentiated from topological physics by contrasting momentum and photon energy and polarization dependencies. These observations demonstrate significant deviations of photoelectron and quasiparticle spin polarizations. Our findings illustrate the inherent complexity of spin-resolved ARPES and demonstrate key considerations for interpreting experimental results.

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“…Beyond that, it was shown that spin-polarized photoelectrons, excited by unpolarized light, are emitted from unpolarized bulk-derived electronic states even in normal-emission geometry from Pt(110), Pt(100), Pt(111), and Au(111) [6,[11][12][13]. In these experiments, the observed spin features of photoelectrons were found to be strongly influenced by the crystal symmetry.…”

mentioning

confidence: 92%

Tuning the spin signal from a highly symmetric unpolarized electronic state

et al. 2015

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A remarkably large spin signal is observed on nonmagnetic W(110) for a highly symmetric unoccupied state with no intrinsic spin polarization. The magnitude and, more importantly, the sign of this spin signal, measured by spin-and angle-resolved inverse photoemission for normal electron incidence, can be tuned in a user-defined manner by variation of the photon-detection angle and/or by rotating the spin-polarization direction of the incident electrons. Using calculations of the orbitally decomposed spectral densities, this effect is traced back to a mixing of different symmetries within the respective state. This explanation is underlined by the behavior of a second electronic state of pure symmetry, which does not show such a spin signal. In general, the spin signals of electronic states are not only influenced by their intrinsic spin polarization but also by the choice of symmetry-breaking experimental parameters in combination with the particular orbital characters of the states under investigation. The latter permits one to tune the spin signal in magnitude and sign.

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Spin polarized photoelectrons with unpolarized light in normal emission from Pt(110)

Cited by 18 publications

References 14 publications

Magnetic dichroism and electron spin polarization in photoemission: analytical results

Magnetic dichroism and electron spin polarization in photoemission: analytical results

Widespread spin polarization effects in photoemission from topological insulators

Tuning the spin signal from a highly symmetric unpolarized electronic state

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