Dr. Voloshina erforscht die elektronischen und magnetischen Eigenschaften von zweidimensionalen Materialien und deren Grenzflächen mittels computergestützter Methoden und oberflächenanalytischer Techniken. Ihr aktueller Fokus liegt auf Schichtmaterialien wie Graphen, Übergangsmetall-Phosphor-Trichalcogenide (MPX₃) und verwandte van-der-Waals-Systeme, deren Eigenschaften durch Substrateinfluss, Defekte oder Interkalaion gezielt manipuliert werden können. Diese Erkenntnisse ermöglichen die Entwicklung von Spintronic-Bauelementen, Sensoren und katalytisch aktiven Materialien für Wasserspaltung und Energieanwendungen. Die Arbeiten verbinden experimentelle Oberflächencharakterisierung (Spektroskopie, Rastersondenmikroskopie) mit theoretischen Vorhersagen und adressieren damit Anforderungen in der Halbleiter-, Energie- und Sensortechnik.
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Dr. Elena Voloshina
HU-FIS-Profil ↗Förderer: DFG Eigene Stelle (Sachbeihilfe) Zeitraum: 07/2013 - 08/2017 Projektleitung: Dr. Elena Voloshina
Förderer: DFG Schwerpunktprogramm Zeitraum: 01/2014 - 03/2017 Projektleitung: Dr. Elena Voloshina
Förderer: DFG Sonderforschungsbereich Zeitraum: 04/2014 - 12/2017 Projektleitung: Dr. Elena Voloshina
Physical Chemistry Chemical Physics · DOI
The electronic structure of the zero-gap two-dimensional graphene has a charge neutrality point exactly at the Fermi level that limits the practical application of this material. There are several ways to modify the Fermi-level-region of graphene, e.g. adsorption of graphene on different substrates or different molecules on its surface. In all cases the so-called dispersion or van der Waals interactions can play a crucial role in the mechanism, which describes the modification of electronic structure of graphene. The adsorption of water on graphene is not very accurately reproduced in the standard density functional theory (DFT) calculations and highly-accurate quantum-chemical treatments are required. A possibility to apply wavefunction-based methods to extended systems is the use of local correlation schemes. The adsorption energies obtained in the present work by means of CCSD(T) are much higher in magnitude than the values calculated with standard DFT functional although they agree that physisorption is observed. The obtained results are compared with the values available in the literature for binding of water on the graphene-like substrates.
Applied Physics Letters · DOI
We report an element-specific investigation of electronic and magnetic properties of the graphene/Ni(111) system. Using x-ray magnetic circular dichroism, the occurrence of an induced magnetism of the carbon atoms in the graphene layer is observed. We attribute this magnetic moment to the strong hybridization between C π and Ni 3d valence band states. The net magnetic moment of carbon in the graphene layer is estimated to be in the range of 0.05–0.1 μB per atom.
Physical Chemistry Chemical Physics · DOI
Detailed theoretical understanding of the interaction between pristine and defective α-Fe <sub>2</sub> O <sub>3</sub> (0001) surfaces and an isolated water molecule.