Department of Reactive Transport
In the Reactive Transport Department we study the heterogeneity of material surface reactivity, including sorption and dissolution reactions and material degradation. We use experimental and numerical methods to quantify and predict surface reaction rates using rate maps. Transport in complex porous materials is another important aspect of our work. We develop conservative and reactive radionuclide tracers using our cyclotron laboratory and apply positron emission tomography (PET). We use and develop numerical methods for transport analysis at the pore scale and above. Our research is motivated and driven by applications in nuclear safety research and we provide critical links to earth, environmental and materials sciences.
Latest publication
Implementing electronic signatures of graphene and hexagonal boron nitride in twisted bilayer molybdenum disulfide
Arnold, F. M.; Ghasemifard, A.; Kuc, A. B.; Heine, T.
Abstract
Angeli and MacDonald reported a superlattice-imposed Dirac band in twisted bilayer molybdenum disulphide (tBL MoS2) for small twist angles towards the R_h^M (parallel) stacking. Using a hierarchical set of theoretical methods, we show that the superlattices differ for twist angles with respect to metastable R_h^M (0°) and lowest-energy H_h^h (60°) configurations. When approaching R_h^M stacking, identical domains with opposite spatial orientation emerge. They form a honeycomb superlattice, yielding Dirac bands and a lateral spin texture distribution with opposite-spin-occupied K and K’ valleys. Small twist angles towards the H_h^h configuration (60°) generate H_h^h and H_h^X stacking domains of different relative energies and, hence, different spatial extensions. This imposes a symmetry break in the moiré cell, which opens a gap between the two top-valence bands, which become flat already for relatively small moiré cells. The superlattices impose electronic superstructures resembling graphene and hexagonal boron nitride into trivial semiconductor MoS2.
Related publications
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Data publication: Implementing electronic signatures of graphene and hexagonal …
ROBIS: 37274 HZDR-primary research data are used by this (Id 37273) publication
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Materials Today 73(2024), 96-104
DOI: 10.1016/j.mattod.2024.01.012
Cited 1 times in Scopus -
Invited lecture (Conferences)
MRS Fall Meeting, 01.-06.12.2024, Boston, USA
Permalink: https://www.hzdr.de/publications/Publ-37273
Team
Head/ Administration | |||||
Name | Bld./Office | +49 351 260 | Position/Tasks | ||
---|---|---|---|---|---|
Prof. Dr. Cornelius Fischer | L9.3/212 | 4660 | c.fischer![]() | Head of Department | |
Katrin Gerstner | L9.3/217 | 4601 | k.gerstner![]() | Secretary's office / Administration Reactive Transport / Experimental Neurooncological Radiopharmacy | |
Nadja Pedrosa Gil | L9.3/221 | 4690 | n.pedrosa-gil![]() | Business administration Reactive Transport Business administration Experimental Neurooncological Radiopharmacy | |
Employees | |||||
Name | Bld./Office | +49 351 260 | Position/Tasks | ||
Alexandra Becker | L9.3/211 | 4692 | a.becker![]() | PhD Student | |
Ismail Eren | L9.3/211 | 4692 | i.eren![]() | PhD Student | |
Elvira Gouatieu Dongmo | L9.3/211 | 4692 | e.gouatieu-dongmo![]() | PhD Student | |
Sieglinde Holzknecht | L9.3/222 | 4664 | s.holzknecht![]() | PhD Student | |
Dr. Johannes Kulenkampff | L9.3/202 | 4663 | j.kulenkampff![]() | Research Scientist | |
Dr. Marcel Lindemann | L9.3/318 | 4671 | m.lindemann![]() | Research Scientist | |
Dr. habil. Holger Lippold | L9.3/401 | 4672 | h.lippold![]() | Research Scientist | |
Jing Liu | L9.3/211 | 4692 | j.liu![]() | PhD Student | |
Dagmar Lösel | L9.3/402 | 4673 | d.loesel![]() | Laboratory technician | |
Dr. Alexander Mansel | a.mansel![]() | Research Scientist | |||
Jann Schöngart | L9.3/222 | 4658 | j.schoengart![]() | PhD Student | |
Claudia Schößler | L9.3/402 | 4674 | c.schoessler![]() | Chemical laboratory technician | |
Wenyu Zhou | L9.3/222 | 4664 | w.zhou![]() | Doktorand | |
Other employees | |||||
Name | Bld./Office | +49 351 260 | Position/Tasks | ||
Dr. Karsten Franke | L9.3/318 | 4629 | k.franke![]() | Research Associate |