Optical injection of spin and pseudospin polarization and current in van der Waals layered structures

36

2014-10-01

900258

Optical injection of spin and pseudospin polarization and current in van der Waals layered structures

2D crystals, spin, transition metal dichalcogenid, valley, Van der Waals heterostructure

Physics

Physical Sciences (P)

17305914

General Research Fund (GRF)

2014

Completed

1 Investigate optical transition selection rules, interlayer hopping matrix element, optical transition matrix elements of interlayer transition in van der Waals layered structures of transition metal dichalcogenides; investigate the optical selection rule of the various excitonic transitions to the ground state and excited states of intralayer excitons; investigate various types of interlayer and intralayer excitons and trions and explore their roles in optical manipulations in the layered structures. 2 Explore schemes for optical generation of spin and pseudospin polarizations in van der Waals layered structures; explore schemes for realizing spin dependent interlayer hopping of carriers using optical controls and the control of spin currents across the layered structures; investigate the generation of spin and pseudospin polarization through the control of interlayer excitons. 3 Investigate schemes for direct generation of spin and pseudospin currents in transition metal dichalcogenides monolayers and their van der Waals layered structures; investigate two-photon transition matrix elements and two-photon absorption processes; investigate the injection of ballistic spin and valley currents using the quantum interference by one-photon and two-photon processes in transition metal dichalcogenides monolayer and their van der Waals layered structures.