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2020-01-23
14:54
OpenAccess [PUBDB-2020-00522] Journal Article
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Time- and momentum-resolved photoemission studies using time-of-flight momentum microscopy at a free-electron laser
Time-resolved photoemission with ultrafast pump and probe pulses is an emerging technique with wide application potential. Real-time recording of nonequilibrium electronic processes, transient states in chemical reactions, or the interplay of electronic and structural dynamics offers fascinating opportunities for future research. [...]
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ddc:620
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2020-01-14
12:17
[PUBDB-2020-00200] Journal Article
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Reversible coordination-induced spin-state switching in complexes on metal surfaces
Molecular spin switches are attractive candidates for controlling the spin polarization developing at the interface between molecules and magnetic metal surfaces, which is relevant for molecular spintronics devices. However, so far, intrinsic spin switches such as spin-crossover complexes have suffered from fragmentation or loss of functionality following adsorption on metal surfaces, with rare exceptions. [...]
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ddc:600
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2020-01-14
12:13
[PUBDB-2020-00199] Journal Article
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Yu–Shiba–Rusinov States in the Charge-Density Modulated Superconductor $NbSe_{2}$
Nano letters 20(1), 339 - 344 () [10.1021/acs.nanolett.9b03988]  GO
NbSe2 is a remarkable superconductor in which charge-density order coexists with pairing correlations at low temperatures. Here, we study the interplay of magnetic adatoms and their Yu–Shiba–Rusinov (YSR) bound states with the charge density order. [...]
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ddc:660
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2020-01-07
12:58
OpenAccess [PUBDB-2020-00041] Journal Article
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80% Valley Polarization of Free Carriers in Singly Oriented Single-Layer $WS_{2}$ on Au(111)
We employ time- and angle-resolved photoemission spectroscopy to study the spin- and valley-selectivephotoexcitation and dynamics of free carriers at the ‾ K and ‾ K0 points in singly oriented single-layerWS2=Auð111Þ. Our results reveal that in the valence band maximum an ultimate valley polarization of freeholes of 84% can be achieved upon excitation with circularly polarized light at room temperature. [...]
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ddc:530
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2019-10-18
12:19
OpenAccess [PUBDB-2019-03710] Journal Article
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Surface structure and stacking of the commensurate $(√13 × √13)R13.9°$ charge density wave phase of $1T−TaS_{2}(0001)$
By quantitative low-energy electron diffraction (LEED) we investigate the extensively studied commensurate charge density wave (CDW) phase of trigonal tantalum disulphide (1T−TaS2), which develops at low temperatures with a (13×13)R13.9∘ periodicity. A full-dynamical analysis of the energy dependence of diffraction spot intensities reveals the entire crystallographic surface structure, i.e., the detailed atomic positions within the outermost two trilayers consisting of 78 atoms as well as the CDW stacking. [...]
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ddc:530
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2019-09-30
11:05
OpenAccess [PUBDB-2019-03496] Journal Article
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Surface states and Rashba-type spin polarization in antiferromagnetic $MnBi_{2}Te_{4}$ (0001)
The layered van der Waals antiferromagnet $MnBi_{2}Te_{4}$ (0001) has been predicted to combine the band ordering of archetypical topological insulators such as Bi2Te3 with the magnetism of Mn, making this material a viable candidate for the realization of various magnetic topological states. We have systematically investigated the surface electronic structure of $MnBi_{2}Te_{4}$ (0001)single crystals by use of spin- and angle-resolved photoelectron spectroscopy experiments. [...]
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ddc:530
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2019-08-12
16:52
Embargoed OpenAccess [PUBDB-2019-02991] Journal Article
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Influence of Substrate Electronic Properties on the Integrity and Functionality of an Adsorbed Fe(II) Spin-Crossover Compound
The bistability of spin-crossover complexes on surfaces is of great interest for potential applications. Using X-ray absorption spectroscopy, we investigated the properties of [Fe(pypyr(CF$_3$)$_2$)$_2$(phen)] (pypyr = 2-(2′-pyridyl)pyrrolide, phen = 1,10-phenanthroline), a vacuum-evaporable Fe(II) complex, in direct contact to a set of substrates. [...]
Published on 2019-07-01. Available in OpenAccess from 2020-07-01.: Download fulltextPDF; Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
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2019-01-10
10:31
OpenAccess [PUBDB-2019-00262] Journal Article
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Quasi-free-standing single-layer $\mathrm{WS_{2}}$ achieved by intercalation
Large-area and high-quality single-layer transition metal dichalcogenides can be synthesized by epitaxial growth on single-crystal substrates. An important advantage of this approach is that the interaction between the single layer and the substrate can be strong enough to enforce a single crystalline orientation of the layer [...]
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ddc:530
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2018-12-19
14:25
Embargoed OpenAccess [PUBDB-2018-05746] Journal Article

More than electrons
Nature materials 17(8), 658 - 660 () [10.1038/s41563-018-0131-4]  GO
Published on 2018-07-24. Available in OpenAccess from 2019-01-24.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:610
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2018-10-12
15:25
Embargoed OpenAccess [PUBDB-2018-03763] Journal Article
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Light-Induced Spin Crossover in an Fe(II) Low-Spin Complex Enabled by Surface Adsorption
Understanding and controlling the spin-crossover properties of molecular complexes can be of particular interest for potential applications in molecular spintronics. Using near-edge X-ray absorption fine structure spectroscopy, we investigated these properties for a new vacuum-evaporable Fe(II) complex, namely [Fe(pypyr(CF$_3$)$_2$)$_2$(phen)] (pypyr = 2-(2′-pyridyl)pyrrolide, phen = 1,10-phenanthroline). [...]
Published on 2018-03-06. Available in OpenAccess from 2019-03-06.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA); External link: Download fulltextFulltext
ddc:530
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