Zobrazeno 1 - 10
of 445
pro vyhledávání: '"Urban Daniel"'
We investigate nitrogen-vacancy center (NV) ensembles in diamond under the influence of strongly-correlated electron-spin baths. We thoroughly calculate the decoherence properties of the NV central spin for bath concentrations of 0.1-100 ppm using th
Externí odkaz:
http://arxiv.org/abs/2404.08388
The integrated device of a perovskite solar cell with a Li-ion battery is an innovative solution for decentralized energy storage in smart electronic devices. In this study, we examine the stability of Li ions intercalated in a CsPbI$_3$ perovskite a
Externí odkaz:
http://arxiv.org/abs/2403.18601
We present a theoretical study on the magnetic signals of structural surface defects like cracks or indents combined with rough surfaces or subsurface inclusions of soft ferromagnetic metals like body-centered cubic Fe or amorphous CoFeB. We discuss
Externí odkaz:
http://arxiv.org/abs/2403.08412
Halide perovskites are highly promising light-harvesting materials with strong ionic character, enabling in principle the combination of a solar cell and a Li-ion battery in one integrated photo-battery device. Here, we investigate Li ions inside cry
Externí odkaz:
http://arxiv.org/abs/2403.01557
Autor:
Schätzle, Philip, Ghassemizadeh, Reyhaneh, Urban, Daniel F., Wellens, Thomas, Knittel, Peter, Reiter, Florentin, Jeske, Jan, Hahn, Walter
We investigate the spin-coherence decay of NV$^-$-spins interacting with the strongly-coupled bath of nitrogen defects in diamond layers. For thin diamond layers, we demonstrate that the spin-coherence times exceed those of bulk diamond, thus allowin
Externí odkaz:
http://arxiv.org/abs/2401.16169
Dynamical Mean Field Theory (DMFT) is one of the powerful computatioinal approaches to study electron correlation effects in solid-state materials and molecules. Its practical applicability is, however, limited by the exponential growth of the many-p
Externí odkaz:
http://arxiv.org/abs/2311.10402
Formation energy profiles of oxygen vacancies at grain boundaries in perovskite-type electroceramics
Oxygen vacancy formation energies play a major role in the electric field assisted abnormal grain growth of technologically relevant polycrystalline perovskite phases. The underlying effect on the atomic scale is assumed to be a redistribution of cat
Externí odkaz:
http://arxiv.org/abs/2301.07677
Publikováno v:
Physical Review B 106, 174111 (2022)
We present a density functional theory analysis of the negatively charged nitrogen-vacancy (NV) defect complex located at or close to the core of 30$^\circ$ and 90$^\circ$ partial glide dislocations in diamond. Formation energies, electronic densitie
Externí odkaz:
http://arxiv.org/abs/2206.05040
Autor:
Mahfoud Felix, Urban Daniel, Teller Desiree C, Ukena Christian, Fries Peter, Schneider Günther, Gebker Rolf, Schneeweis Christopher, Stawowy Philipp, Schlaich Markus P, Esler Murray D, Fleck Eckart, Böhm Michael, Kelle Sebastian
Publikováno v:
Journal of Cardiovascular Magnetic Resonance, Vol 15, Iss Suppl 1, p E108 (2013)
Externí odkaz:
https://doaj.org/article/e037eec0d2c34c51a962a7dc4e4c8c4e
We investigate grain boundaries (GBs) in the cubic inverse Heusler phase Fe$_2$CoGa by means of first principles calculations based on density functional theory. Besides the energetic stability, the analysis focuses on the magnetic properties of a se
Externí odkaz:
http://arxiv.org/abs/2110.15896