Event Date and Time
Duy Quang To, Department of Materials Science & Engineering, University of Delaware
In this talk I am going to present my developments of the tunneling theory with multiband k.p method for a spinorbitronic application with semiconductor and related materials. Spinorbitronic combines the effects of spin and orbit, which via spin-orbit coupling, introduces new transport properties such as spin Hall and anomalous Hall effects. The latter is characterized by a deflection of the trajectory of polarized carriers in the transverse direction of their flow. Other characteristic effects concern i) the spin transfer mechanisms for switching angular momentum transfer magnetization, thus generalizing spin transfer as well as ii) spin-charge conversion mediated by the terms Rashba or Dresselhaus. We show that our theory can be used to describe the spin transport of spin-orbit coupled states in semiconductor heterostructures also can be adapted to many systems like LAO/STO, etc…. We show, for example, how the transverse spin components of the current are relevant to switch a magnetization, the role of evanescent wave in spin to charge interconversion with III-V ferromagnetic semiconductor. We successfully compare our state-of-the-art multiband k.p results on the optical anisotropy of absorption between the directions (110 and (1-10) of the electric field when the symmetry of the heterostructure is reduced to C2v symmetry. In addition, we give an theoretical evidence for spin to charge in LAO/STO system which is a key role to obtain the THz emission using laser pumping and finally we end up with a contribution of non-magnetic material in the amplitude of THz signal from theoretical point of view.