Identically Sized Co Quantum Dots on Monolayer WS2 Featuring Ohmic Contact

Manipulations of Electronic and Spin States in Co-Quantum Dot/WS2 Heterostructure on a Metal-Dielectric Composite Substrate by Controlling Interfacial Carriers

“…Additionally, the Co-QDs exhibit bright dots with a height of 0.33 nm at occupied states (Figure c) while showing dark dots with a depth of 0.17 nm at unoccupied states (Figure d). These special morphological features dependent on the bias polarity were also discovered in Fe and other alkali metal atoms on a MoS 2 substrate. − According to the previous report, the Co-QD possesses four Co atoms with one on the top and three on the bottom, forming a pyramid magic structure (Figure a).…”

“…These special morphological features dependent on the bias polarity were also discovered in Fe and other alkali metal atoms on a MoS 2 substrate. 25−27 According to the previous report, 27 the Co-QD possesses four Co atoms with one on the top and three on the bottom, forming a pyramid magic structure (Figure 1a).…”

“…The atomic model of Co-QD/WS 2 heterostructure is constructed (Figure a), and the corresponding interfacial potential is calculated (Figure b). As shown, only a small increase happens at the interface (marked by a red circle), indicating the formation of a quasi-Ohmic contact between Co-QDs and WS 2 , which is attributed to the reduced work function of Co-QDs owing to the size effect . Therefore, the interfacial barrier at the WS 2 and c-Ag interface is mainly concerned.…”

“…As shown, only a small increase happens at the interface (marked by a red circle), indicating the formation of a quasi-Ohmic contact between Co-QDs and WS 2 , which is attributed to the reduced work function of Co-QDs owing to the size effect. 27 Therefore, the interfacial barrier at the WS 2 and c-Ag interface is mainly concerned. Being assisted by the thin dielectronic layer in the composite substrate, the interfacial potential is further elevated and hinders carrier transport at the interface.…”

Controllable enormous valley splitting in Janus WSSe on CrN monolayer

“…All the configurations are relaxed to optimize the vdW interaction between WSSe and CrN, the optimized interlayer distance (d), charge transfer from CrN (Q) and magnetic moment of WSSe (M w ) are provided in table 1. To evaluate the stability of the heterostructures, the binding energies are calculated through the equation: [34], where E WSSe/CrN , E CrN and E WSSe denote the energies of WSSe/CrN heterostructures, freestanding monolayer CrN and WSSe, respectively. All calculated binding energies are negative (seeing table 1), indicating good stability of the stacking structures.…”