Seminarium Fizyki Politechniki Wrocławskiej
PWr, bud. A1, sala 322
Monolayer Janus materials: novel systems hosting charge density waves
Prof. Karol Szałowski
Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Łódź
Janus monolayers of transition metal dichalcogenides (TMDs) exhibit remarkable physical properties owing to the intrinsic symmetry breaking. On the other hand, certain TMDs (such as TaS2) are known to develop charge density wave (CDW) ordering, influencing their physics profoundly. Combining these two features can be expected to trigger the emergence of highly interesting effects.
In this talk, a computational, density functional theory-based perspective on monolayer Janus 1T-TaSSe TMD will be given. Both normal-state and CDW-state properties will be characterized (with extensive comparison to TaS2 and TaSe2 properties). In particular, the emergence of a weakly dispersive band in the vicinity of the Fermi level, exhibiting pronounced spin–orbit coupling will be addressed. The sensitivity of the system to the external electric field will be discussed. Selected results obtained for a heterostructure composed of monolayer TaSSe and monolayer graphene will further enrich the presented computational predictions.
The results suggest that Janus TMDs may constitute a novel promising platform for studies of CDW-related phenomena in systems with an additional source of symmetry breaking.
