Novel valley related topological physics in monolayer transition metal dichalcogenides and graphene-like 2D crystals formed by group IVA elements
Grant Data
Project Title
Novel valley related topological physics in monolayer transition metal dichalcogenides and graphene-like 2D crystals formed by group IVA elements
Duration
36
Start Date
2012-11-01
Amount
1025000
Conference Title
Novel valley related topological physics in monolayer transition metal dichalcogenides and graphene-like 2D crystals formed by group IVA elements
Presentation Title
Keywords
monolayer transition metal dichalcogenides
Discipline
Physics
Panel
Physical Sciences (P)
HKU Project Code
HKU 706412P
Grant Type
General Research Fund (GRF)
Funding Year
2012
Status
Completed
Objectives
1 Formulate tight-binding models for monolayer MoS2 and WS2; extract parameters for the tight-binding model by fitting the band structures from first principle calculations near the K points; formulate Berry curvatures, orbital magnetic moments, and interband optical transition matrix elements in the bulk bands near the K points. 2 Investigate orbital magnetic moment, valley Hall effects, and valley dependent optical circular dichroism; investigate excitons and the Berry phase effect on its transport; investigate charging effects of excitons; investigate the physics at the edge of the monolayers. 3 Investigate the interplay between spin and valley degrees of freedom; develop schemes for manipulating valley and spin dynamics by external controls in the bulk and on the edges; explore potential applications exploiting valley index as an information carrier.