References of "Physical Review. B, Condensed Matter and Materials Physics"
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See detailErratum: Third-order effect in magnetic small-angle neutron scattering by a spatially inhomogeneous medium [Phys. Rev. B 91, 054404 (2015)]
Metlov, K.L.; Michels, Andreas UL

in Physical Review. B, Condensed Matter and Materials Physics (2019), 99

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See detailEvidence for the formation of nanoprecipitates with magnetically disordered regions in bulk Ni50Mn45In5 Heusler alloys
Benacchio, G.; Titov, Ivan UL; Malyeyev, Artem UL et al

in Physical Review. B, Condensed Matter and Materials Physics (2019), 99

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See detailUnconventional superconductivity in the extended Hubbard model: Weak-coupling renormalization group
Wolf, Sebastian; Schmidt, Thomas UL; Rachel, Stephan

in Physical Review. B, Condensed Matter and Materials Physics (2018)

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See detailThird-order effect in magnetic small-angle neutron scattering by a spatially inhomogeneous medium
Metlov, K.L.; Michels, Andreas UL

in Physical Review. B, Condensed Matter and Materials Physics (2015), 91

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See detailScreening of electron-phonon coupling in graphene on Ir(111)
Endlich, M.; Molina-Sanchez, Alejandro UL; Wirtz, Ludger UL et al

in Physical Review. B, Condensed Matter and Materials Physics (2013), 88(205403),

The phonon dispersion of graphene on Ir(111) has been determined by means of angle-resolved inelastic electron scattering and density functional calculations. Kohn anomalies of the highest optical-phonon ... [more ▼]

The phonon dispersion of graphene on Ir(111) has been determined by means of angle-resolved inelastic electron scattering and density functional calculations. Kohn anomalies of the highest optical-phonon branches are observed at the ¯ and ¯K point of the surface Brillouin zone. At ¯K the Kohn anomaly is weaker than observed for pristine graphene and graphite. This observation is rationalized in terms of a decrease of the electron-phonon coupling due to screening of graphene electron correlations by the metal substrate. [less ▲]

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See detailAnomalous quantum confinement of the longitudinal optical phonon mode in PbSe quantum dots
Habinshuti, J.; Kilian, O.; Cristini-Robbe, O. et al

in Physical Review. B, Condensed Matter and Materials Physics (2013), 88(11), 115313

We have investigated the diameter dependence of the Raman spectra of lead selenide nanocrystals. The first-order Raman peak at about 136 cm−1 and its second-order overtone at twice this wavenumber move up ... [more ▼]

We have investigated the diameter dependence of the Raman spectra of lead selenide nanocrystals. The first-order Raman peak at about 136 cm−1 and its second-order overtone at twice this wavenumber move up in energy with decreasing nanocrystal diameter. This anomalous behavior is interpreted in terms of quantum confinement of the longitudinal optical (LO) phonon whose frequency displays a minimum at in the dispersion of bulk PbSe. We perform ab initio calculations of the phonons of PbSe slabs with up to 15 layers. The LO mode perpendicular to the slab shifts indeed upwards with decreasing layer thickness, thus validating the interpretation of the anomalous radius dependence of the Raman spectra in terms of quantum confinement. [less ▲]

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See detailEffect of spin-orbit interaction on the optical spectra of single-layer, double-layer, and bulk MoS2
Molina-Sanchez, Alejandro UL; Sangalli, Davide; Hummer, Kerstin et al

in Physical Review. B, Condensed Matter and Materials Physics (2013)

We present converged ab initio calculations of the optical absorption spectra of single-layer, double-layer, and bulk MoS2. Both the quasiparticle-energy calculations (on the level of the GW approximation ... [more ▼]

We present converged ab initio calculations of the optical absorption spectra of single-layer, double-layer, and bulk MoS2. Both the quasiparticle-energy calculations (on the level of the GW approximation ) and the calculation of the absorption spectra (on the level of the Bethe-Salpeter equation) explicitly include spin-orbit coupling, using the full spinorial Kohn-Sham wave functions as input. Without excitonic effects, the absorption spectra would have the form of a step function, corresponding to the joint density of states of a parabolic band dispersion in two dimensions. This profile is deformed by a pronounced bound excitonic peak below the continuum onset. The peak is split by spin-orbit interaction in the case of single-layer and (mostly) by interlayer interaction in the case of double-layer and bulk MoS2. The resulting absorption spectra are thus very similar in the three cases, but the interpretation of the spectra is different. Differences in the spectra can be seen in the shape of the absorption spectra at 3 eV where the spectra of the single and double layers are dominated by a strongly bound exciton. [less ▲]

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See detailTheory of magnetic small-angle neutron scattering of two-phase ferromagnets
Honecker, Dirk UL; Michels, Andreas UL

in Physical Review. B, Condensed Matter and Materials Physics (2013), 87(224426), 1-10

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See detailMagnetic ordering in nanocrystalline gadolinium: A neutron diffraction study
Ryan, D. H.; Michels, Andreas UL; Döbrich, Frank UL et al

in Physical Review. B, Condensed Matter and Materials Physics (2013), 87(064408), 1-6

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See detailDielectric screening of the Kohn anomaly of graphene on hexagonal boron nitride
Forster, F.; Molina-Sanchez, Alejandro UL; Engels, S. et al

in Physical Review. B, Condensed Matter and Materials Physics (2013), 88

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See detailAnalysis of magnetic neutron-scattering data of two-phase ferromagnets
Honecker, Dirk UL; Dewhurst, Charles; Suzuki, Kiyonori et al

in Physical Review. B, Condensed Matter and Materials Physics (2013), 88

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See detailMicromagnetic modeling and small-angle neutron scattering characterization of magnetic nanocomposites
Erokhin, Sergey; Berkov, Dmitry; Gorn, Nataliya et al

in Physical Review. B, Condensed Matter and Materials Physics (2012), 85(024410), 1-12

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See detailNeutron scattering study of the magnetic microstructure of nanocrystalline gadolinium
Döbrich, Frank UL; Kohlbrecher, Joachim; Sharp, Melissa et al

in Physical Review. B, Condensed Matter and Materials Physics (2012), 85(094411), 1-17

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See detailMagnetic neutron scattering on nanocomposites: Decrypting cross-section images using micromagnetic simulations
Erokhin, Sergey; Berkov, Dmitry; Gorn, Nataliya et al

in Physical Review. B, Condensed Matter and Materials Physics (2012), 85(134418), 1-5

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See detailObservation of cross-shaped anisotropy in spin-resolved small-angle neutron scattering
Michels, Andreas UL; Honecker, Dirk UL; Döbrich, Frank UL et al

in Physical Review. B, Condensed Matter and Materials Physics (2012), 85(184417), 1-5

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See detailAnisotropic excitonic effects in the energy loss function of hexagonal boron nitride
Galambosi, S.; Wirtz, Ludger UL; Soininen, J. A. et al

in Physical Review. B, Condensed Matter and Materials Physics (2011), 83(8), 081413

The anisotropy of the valence energy-loss function of hexagonal boron nitride (hBN) is shown to be largely enhanced by the highly inhomogeneous character of the excitonic states. The energy loss with ... [more ▼]

The anisotropy of the valence energy-loss function of hexagonal boron nitride (hBN) is shown to be largely enhanced by the highly inhomogeneous character of the excitonic states. The energy loss with momentum transfer parallel to the BN layers is dominated by strongly bound, quasi-two-dimensional excitons. In contrast, excitations with momentum transfer perpendicular to the layers are influenced by weakly bound three-dimensional excitons. This striking phenomenon is revealed by a combined study using high-precision nonresonant inelastic x-ray scattering measurements supported by ab initio calculations. The results are relevant in general to layered insulating systems. [less ▲]

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See detailVariations in the work function of doped single- and few-layer graphene assessed by Kelvin probe force microscopy and density functional theory
Ziegler, D.; Gava, P.; Guettinger, J. et al

in Physical Review. B, Condensed Matter and Materials Physics (2011), 83(23),

We present Kelvin probe force microscopy measurements of single-and few-layer graphene resting on SiO2 substrates. We compare the layer thickness dependency of the measured surface potential with ab ... [more ▼]

We present Kelvin probe force microscopy measurements of single-and few-layer graphene resting on SiO2 substrates. We compare the layer thickness dependency of the measured surface potential with ab initio density functional theory calculations of the work function for substrate-doped graphene. The ab initio calculations show that the work function of single-and bilayer graphene is mainly given by a variation of the Fermi energy with respect to the Dirac point energy as a function of doping, and that electrostatic interlayer screening only becomes relevant for thicker multilayer graphene. From the Raman G-line shift and the comparison of the Kelvin probe data with the ab initio calculations, we independently find an interlayer screening length in the order of four to five layers. Furthermore, we describe in-plane variations of the work function, which can be attributed to partial screening of charge impurities in the substrate, and result in a nonuniform charge density in single-layer graphene. [less ▲]

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See detailCoupling of excitons and defect states in boron-nitride nanostructures
Attaccalite, C.; Bockstedte, M.; Marini, A. et al

in Physical Review. B, Condensed Matter and Materials Physics (2011), 83(14), 144115

The signature of defects in the optical spectra of hexagonal boron nitride (BN) is investigated using many-body perturbation theory. A single BN-sheet serves as a model for different layered BN ... [more ▼]

The signature of defects in the optical spectra of hexagonal boron nitride (BN) is investigated using many-body perturbation theory. A single BN-sheet serves as a model for different layered BN nanostructures and crystals. In the sheet we embed prototypical defects such as a substitutional impurity, isolated boron and nitrogen vacancies, and the divacancy. Transitions between the deep defect levels and extended states produce characteristic excitation bands that should be responsible for the emission band around 4 eV, observed in luminescence experiments. In addition, defect bound excitons occur that are consistently treated in our ab initio approach along with the "free" exciton. For defects in strong concentration, the coexistence of both bound and free excitons adds substructure to the main exciton peak and provides an explanation for the corresponding feature in cathodo- and photoluminescence spectra. [less ▲]

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See detailPhonons in single-layer and few-layer MoS2 and WS2
Molina-Sanchez, Alejandro UL; Wirtz, Ludger UL

in Physical Review. B, Condensed Matter and Materials Physics (2011), 84

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See detailInfluence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal
Michels, Andreas UL; Bick, Jens-Peter UL; Birringer, R. et al

in Physical Review. B, Condensed Matter and Materials Physics (2011), 83

Detailed reference viewed: 84 (16 UL)