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Raluca-Maria Stan: Single-layer NbS2 on Au (111): crystal structure and electronic characterization

posted 12 Aug 2019, 07:03 by info admin   [ updated 12 Aug 2019, 07:08 ]
Raluca-Maria Stan, Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark 

Theoretical studies on single-layer (SL) NbS2 have shown that the inclusion of different many-body effects has a significant impact on the electronic structure of this system [1]. This might be a unique case for experimentally tuning the different many-body interactions--by the choice of substrate or doping--in order to reach a desired ground state. 
We present a SL NbS2 that has been epitaxially synthesized on Au (111) substrate [2]. Complementary techniques like scanning tunneling microscopy, low-energy electron diffraction indicate excellent crystalline quality and the NbS2 lattice is aligned with respect to the Au (111) substrate. Furthermore, the SL NbS2 has a hexagonal structure with a measured lattice constant of (3.29±0.03) Å which is in agreement with the lattice constant of the bulk parent [3]. 
The electronic structure of SL NbS2 investigated by means of angle-resolved photoemission spectroscopy reveals two electron pockets crossing the Fermi level. The metallic character has been shown and the general shape of the band structure is consistent with the 1H configuration. The observed band broadening can be due to hybridization with the substrate or strong many-body effects in the system.  

[1] E. G. C. P. van Loon, M. Rösner, et al., npj Quantum Materials 3, 32 (2018)
[2] R. M. Stan, S. K. Mahatha et al., Phys. Rev. Mat. 3, 044003 (2019)
[3] K. F. Mak, C. Lee, et al., Phys. Rev. Lett. 105, 136805 (2010)

Raluca-Maria Stan received her B.Sc. and M.Sc. in Physics at Alexandru Ioan Cuza University of Iasi, in Romania and moved to Denmark in 2016 where she continued with her career in physics. 
She is currently in her last year of her PhD program at Aarhus University. She is supervised by Assoc. Prof. Jill Miwa and Prof. Philip Hofmann. She is interested in 2D materials, particularly single-layer (SL) transition metal dichalcogenides (TMDCs) because of their exotic physics and correlated effects such as charge and spin ordering, Mott insulating states and superconductivity which may behave differently compared to their bulk counterparts. Her PhD project involves the growth of SL TMDCs on Au (111) in order to investigate the structural configuration and the electronic properties of these systems.