Electron pair emission from a W(001) surface: photon versus electron excitation

Muñoz-Navia, M.; Winkler, C.; Patel, R. S.; Birke, M.; Schumann, F. O.; Kirschner, J.

doi:10.1088/0953-8984/21/35/355003

Cited by 5 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is beyond the current experimental time resolution of ª 1 ns. This issue has been addressed recently by comparing coincidence experiments, where the excitation was via photons or electrons, which will be discussed in detail elsewhere [21]. As far as the data shown in Fig.…”

Section: Figurementioning

confidence: 99%

Sensing the electron–electron correlation in solids via double photoemission

Schumann

Winkler

Kirschner

2009

Physica Status Solidi (b)

View full text Add to dashboard Cite

We discuss the electron pair emission from surfaces upon the absorption of a single photon, also called double photoemission (DPE). This experiment is particular sensitive to the electron–electron interaction, because for independent electrons the DPE intensity is zero. We outline the experimental development of this technique over the past decade. Going beyond the mere detection of pairs we advanced the instrumentation. Now we are able to measure the kinetic energies and emission angles of a wide angular acceptance. We will show how the available energy is distributed among the electrons and how the angular distributions look like. The latter enabled us to make contact to an important concept of modern solid state theory, namely the exchange–correlation hole. We demonstrate that the exchange–correlation hole manifests itself in a depletion zone of the coincidence intensity around the fixed emission direction of one electron. The experiments were performed at the synchrotron facilities BESSY I and BESSY II. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

Section: Figurementioning

confidence: 99%

Sensing the electron–electron correlation in solids via double photoemission

Schumann

Winkler

Kirschner

2009

Physica Status Solidi (b)

View full text Add to dashboard Cite

show abstract

“…11, these characteristics persist in the quasiparticle LDOS calculated with the realistic larger V σ im according to Eq. (10).…”

Section: B Valence Electron Densities Of States and (E2e) Spectra Fmentioning

confidence: 99%

“…Since the underlying valence electron states are the same in the two cases, these differences must be due m (E,k x ) of the topmost three monoatomic layers parallel to the surface, which were calculated with the spin-and energy-dependent quasiparticle imaginary self-energy part V σ im (E) as in Eq. (10). In each panel, the diagonal axis represents the valence electron energy E with respect to the Fermi energy.…”

Section: B Valence Electron Densities Of States and (E2e) Spectra Fmentioning

confidence: 99%

“…17 and 18, and associated text), and the spin-dependent imaginary self-energy parts given by Eqs. (10) and (11), with the latter corresponding to a spin-dependent mean free path for the primary and the outgoing electrons. Lower half [(e)-(h)], for spin-down (minority) valence electrons: (e),(f) Weighted LDOS sums N −− and N +− .…”

Section: B Valence Electron Densities Of States and (E2e) Spectra Fmentioning

confidence: 99%

“…For (e,2e), cf. the review article, 4 more recent papers, [5][6][7][8][9][10][11] and further references therein. For (γ,2e), cf.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spin-dependent two-electron emission from ferromagnetic Fe(001)

et al. 2011

View full text Add to dashboard Cite

We present a joint experimental and theoretical study of correlated electron pair emission from a ferromagnetic Fe(001) surface induced by spin-polarized low-energy electrons. Spin-dependent angular and energy distributions of the emitted pairs have been measured and calculated. They are analyzed with the aid of the spin-, momentum-, symmetry-, and layer-resolved valence electron density of states, which we obtained by an ab initio densityfunctional theory calculation. The observed spectra are found to arise almost completely from only three surfaceparallel atomic layers. Momentum distributions for parallel spins of the emitted electrons exhibit an exchangecorrelation hole, which is larger than the correlation hole in the antiparallel spin case. By comparing experimental antiparallel-spin pair spectra with their theoretical counterparts we determine an effective screening strength of the Coulomb interaction in the surface region.

show abstract

Coulomb-correlated electron number states in a transmission electron microscope beam

et al. 2023

View full text Add to dashboard Cite

While correlated electrons are at the heart of many phenomena in condensed matter, as well as atomic and molecular physics, Coulomb interactions in free-electron beams are generally considered detrimental. Here, we demonstrate the generation of Coulomb-correlated pair, triple and quadruple states of free electrons by femtosecond photoemission from a nanoscale field emitter inside a transmission electron microscope. Event-based electron spectroscopy allows the spatial and spectral characterization of the electron ensemble emitted by each laser pulse. We identify distinctive energy and momentum correlations arising from acceleration-enhanced interparticle energy exchange, revealing strong few-body Coulomb interactions at an energy scale of 2 eV. State-sorted beam caustics show a discrete increase in virtual source size and longitudinal source shift for few-electron states, associated with transverse momentum correlations. We observe field-controllable electron antibunching, attributed primarily to transverse Coulomb deflection. The pronounced spatial and spectral characteristics of these electron number states allow filtering schemes that control the statistical distribution of the pulse charge. In this way, the fraction of specific few-electron states can be actively suppressed or enhanced, facilitating the preparation of highly non-Poissonian electron beams for microscopy and lithography, including future heralding schemes and correlated multi-electron probing.

show abstract

Electron pair emission from a W(001) surface: photon versus electron excitation

Cited by 5 publications

References 24 publications

Sensing the electron–electron correlation in solids via double photoemission

Sensing the electron–electron correlation in solids via double photoemission

Spin-dependent two-electron emission from ferromagnetic Fe(001)

Coulomb-correlated electron number states in a transmission electron microscope beam

Contact Info

Product

Resources

About