PhD Dissertation - Sumit Ghosh

PhD Dissertation - Sumit Ghosh

2/27/2019
PRESENTER:       Sumit Ghosh
INSTITUTE:         Ph.D. Candidate supervised by Prof. Aurelien Manchon
DATE:                Wednesday, February 27, 2019
TIME:                 03:30 PM - 05:00 PM
LOCATION:         Ibn Sina Building (Bldg. 3), Room 5220


"Non-Equilibrium Transport in Topologically Non-Trivial Systems"

ABSTRACT:
One of the most remarkable achievements of modern condensed matter physics is the discovery of topological phases of matter. Materials in a non-trivial topological phase or the topological insulators can be distinguished by their unique electronic and transport properties which are indifferent to different types of perturbations and thus open new routes towards the dissipationless transport. Among different classes of topological insulators, the Z2 topological insulators have drawn special attention. Their non-trivial topology originates from their strong spin-orbit coupling which makes them a promising candidate for spintronics application, especially for magnetic memory devices. 

In this dissertation, we are going to see how their inherent topological features give rise to their unique transport properties and their impact on different physical observables. We are going to elaborate on different mechanisms behind the generation of different components of non-equilibrium spin which can be utilized to manipulate the magnetic order parameter in a magnetic memory device. Our study would provide a better understanding of the interfacial physics of a topological insulator-magnetic material heterostructure and thus would be instrumental in designing next-generation spintronics devices.