Surface science at the PEARL beamline of the Swiss Light Source

Muntwiler, Matthias; Zhang, Jun; Stania, Roland; Matsui, Fumihiko; Oberta, P.; Flechsig, d Uwe; Patthey, L.; Quitmann, C.; Glatzel, Thilo; Widmer, Roland; Meyer, Ernst; Jung, Thomas A.; Aebi, Philipp; Fasel, Román; Greber, Thomas

doi:10.1107/s1600577516018646

Cited by 73 publications

(86 citation statements)

References 60 publications

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“…This contradiction indicates strong influence of the kinetic factors and/or surface defects on the h-BN growth on the Ni(111) surface. A newly purchased Ni crystal may have insufficient surface quality for the preferential growth of the fcc-top structure; in this case, a mixture of two configurations can be formed, resulting in a sixfold symmetry of the PED image [45]. In the case of Co(0001) substrate with the ABAB stacking sequence, the presence of AB and BA crystal terminations leads to the two opposite orientations of h-BN.…”

Section: Resultsmentioning

confidence: 99%

“…PED data were acquired at room temperature at the PEARL (X03DA) beamline [45] of the Swiss Light Source synchrotron facility using linear polarization of photons. The normal to the sample surface, the x-ray beam, the polarization vector of photons, and the axis of the analyzer lens were oriented in the horizontal plane, while the entrance slit of the Scienta EW4000 electron analyzer was oriented vertically.…”

Section: Methodsmentioning

confidence: 99%

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Site- and spin-dependent coupling at the highly ordered h -BN/Co(0001) interface

et al. 2018

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Using photoelectron diffraction and spectroscopy, we explore the structural and electronic properties of the hexagonal boron nitride (h-BN) monolayer epitaxially grown on the Co(0001) surface. Perfect matching of the lattice parameters allows formation of a well-defined interface where the B atoms occupy the hollow sites while the N atoms are located above the Co atoms. The corrugation of the h-BN monolayer and its distance from the substrate were determined by means of R-factor analysis. The obtained results are in perfect agreement with the density functional theory (DFT) predictions. The electronic structure of the interface is characterized by a significant mixing of the h-BN and Co states. Such hybridized states appear in the h-BN band gap. This allows to obtain atomically resolved scanning tunneling microscopy (STM) images from the formally insulating 2D material being in contact with ferromagnetic metal. The STM images reveal mainly the nitrogen sublattice due to a dominating contribution of nitrogen orbitals to the electronic states at the Fermi level. We believe that the high quality, well-defined structure and interesting electronic properties make the h-BN/Co(0001) interface suitable for spintronic applications.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Site- and spin-dependent coupling at the highly ordered h -BN/Co(0001) interface

et al. 2018

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“…DFT WC-GGA 2.17 0.55 [38] DFT LDA 2.65 [32] DFT optB86b vdW-DF 2.38 [32] DFT GGA-PBE 2.20 [32] DFT PBE-rVV10 2.2 2.28 [33] DFT revPBE-D3 2.2 1.06 [33] DFT vdW-DF 3.3 0.90 [33] STM 0.5 [20] STM C 60 decoration 2.0 [20] STM 0.7 [25] STM 0.5 [32] STM 0.9 [33] nc-AFM 0.9 [40] XPD 2.20 0.80 this NI-XSW [43] and PhD [46] give almost perfect agreement. For tuning the scattering conditions, the use of synchrotron light is necessary.…”

Section: Methodsmentioning

confidence: 99%

“…For tuning the scattering conditions, the use of synchrotron light is necessary. All experiments presented in this work were carried out at the Photo-Emission and Atomic Resolution Laboratory (PEARL) beam line of the Swiss Light Source (SLS) [46].…”

Section: Methodsmentioning

confidence: 99%

The true corrugation of a h-BN nanomesh layer

2020

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Hexagonal boron nitride (h-BN) nanomesh, a two-dimensional insulating monolayer, grown on the (111) surface of rhodium exhibits an intriguing hexagonal corrugation pattern with a lattice constant of 3.2 nm. Despite numerous experimental and theoretical studies no quantitative agreement has been found on some details of the adsorption geometry such as the corrugation amplitude.The issue highlights the differences in chemical and electronic environment in the strongly bound pore regions and the weakly bound wire regions of the corrugated structure. For reliable results it is important to probe the structure with a method that is intrinsically sensitive to the position of the atomic cores rather than the electron density of states. In this work, we determine the corrugation of h-BN nanomesh from angle-and energy-resolved photoelectron diffraction measurements with chemical state resolution. By combining the results from angle and energy scans and comparing them to multiple-scattering simulations true adsorbate-substrate distance can be measured with high precision, avoiding pitfalls of apparent topography observed in scanning probe techniques.Our experimental results give accurate values for the peak to peak corrugation amplitude (0.80Å), the bonding distance to the substrate (2.20Å) and the buckling of the boron and nitrogen atoms in the strongly bound pore regions (0.07Å). The results are important for the development of theoretical methods involving the quantitative description of van der Waals systems like it requires the understanding of the physics of two-dimensional sp 2 layers.

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“…34 The sample preparation was checked prior to PES experiments using STM. After this, the sample was transferred to the PES chamber under UHV.…”

Section: Methodsmentioning

confidence: 99%

Thermally induced anchoring of a zinc-carboxyphenylporphyrin on rutile TiO2 (110)

Jöhr

Hinaut

Pawlak

et al. 2017

The Journal of Chemical Physics

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Functionalization of surfaces has become of high interest for a wealth of applications such as sensors, hybrid photovoltaics, catalysis, and molecular electronics. Thereby molecule-surface interactions are of crucial importance for the understanding of interface properties. An especially relevant point is the anchoring of molecules to surfaces. In this work, we analyze this process for a zinc-porphyrin equipped with carboxylic acid anchoring groups on rutile TiO2 (110) using scanning probe microscopy. After evaporation, the porphyrins are not covalently bound to the surface. Upon annealing, the carboxylic acid anchors undergo deprotonation and bind to surface titanium atoms. The formation of covalent bonds is evident from the changed stability of the molecule on the surface as well as the adsorption configuration. Annealed porphyrins are rotated by 45° and adopt another adsorption site. The influence of binding on electronic coupling with the surface is investigated using photoelectron spectroscopy. The observed shifts of Zn 2p and N 1s levels to higher binding energies indicate charging of the porphyrin core, which is accompanied by a deformation of the macrocycle due to a strong interaction with the surface.

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Surface science at the PEARL beamline of the Swiss Light Source

Abstract: The Photo-Emission and Atomic Resolution Laboratory is a new soft X-ray beamline at the Swiss Light Source for the study of surface structure using photoelectron diffraction and scanning tunneling microscopy.

Cited by 73 publications

References 60 publications

Site- and spin-dependent coupling at the highly ordered h -BN/Co(0001) interface

Site- and spin-dependent coupling at the highly ordered h -BN/Co(0001) interface

The true corrugation of a h-BN nanomesh layer

Thermally induced anchoring of a zinc-carboxyphenylporphyrin on rutile TiO2 (110)

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