Technical University of Dortmund

About: Technical University of Dortmund is a education organization based out in Dortmund, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Context (language use) & Large Hadron Collider. The organization has 13028 authors who have published 27666 publications receiving 615557 citations. The organization is also known as: Dortmund University & University of Dortmund.

Periodically structured metallic substrates for SERS

Abstract: The detection of organic traces by surface-enhanced Raman scattering (SERS) requires rough metallic substrates with structures in the nanometer range. Regular metallic structures generated by electron-beam lithography are better reproducible than electrochemical roughened surfaces, island films or films over deposited particles. The lithography also allows optimisation of the dimensions of these structures. The SERS enhancement of optimised periodic structures was found to be at least one order of magnitude larger than that of island films.

Activating the molecular spinterface.

Abstract: This Perspective discusses the spin-dependent properties emerging at the interfaces of molecular and inorganic materials, and describes possible future developments for spin-based technologies. The miniaturization trend in the semiconductor industry has led to the understanding that interfacial properties are crucial for device behaviour. Spintronics has not been alien to this trend, and phenomena such as preferential spin tunnelling, the spin-to-charge conversion due to the Rashba–Edelstein effect and the spin–momentum locking at the surface of topological insulators have arisen mainly from emergent interfacial properties, rather than the bulk of the constituent materials. In this Perspective we explore inorganic/molecular interfaces by looking closely at both sides of the interface. We describe recent developments and discuss the interface as an ideal platform for creating new spin effects. Finally, we outline possible technologies that can be generated thanks to the unique active tunability of molecular spinterfaces.

R K and future b → s ℓ ℓ physics beyond the standard model opportunities

Abstract: Flavor changing neutral current (FCNC) | Δ B | = | Δ S | = 1 processes are sensitive to possible new physics at the electroweak scale and beyond, providing detailed information about flavor, chirality and Lorentz structure. Recently the LHCb Collaboration announced a 2.6 σ deviation in the measurement of R K = B ( B ¯ → K ¯ μ μ ) / B ( B ¯ → K ¯ e e ) from the standard model’s prediction of lepton universality. We identify dimension-six operators that could explain this deviation and study constraints from other measurements. Vector and axial-vector four-fermion operators with flavor structure s ¯ b l ¯ l can provide a good description of the data. Tensor operators cannot describe the data. Pseudoscalar and scalar operators only fit the data with some fine-tuning; they can be further probed with the B ¯ → K ¯ e e angular distribution. The data appear to point towards C 9 NP μ = - C 10 NP μ 0 , an SU ( 2 ) L invariant direction in parameter space supported by R K , the B ¯ → K ¯ * μ μ forward-backward asymmetry and the B ¯ s → μ μ branching ratio, which is currently allowed to be smaller than the standard model prediction. We present two leptoquark models which can explain the FCNC data and give predictions for the LHC and rare decays.

Luminosity determination in pp collisions at √s = 8 TeV using the ATLAS detector at the LHC

Abstract: The luminosity determination for the ATLAS detector at the LHC during pp collisions at s√= 8 TeV in 2012 is presented. The evaluation of the luminosity scale is performed using several luminometers ...