We present a new method for high precision measurements of polarization rotation in the
frequency range from 0.2 to 2.2 THz using a fiber coupled time-domain THz spectrometer. A …

Thin films of topological insulators (TI) attract large attention because of expected
topological effects from the intersurface hybridization of Dirac points. However, these effects …

Since the notion of topological insulator (TI) was envisioned in late 2000s, topology has
become a new paradigm in condensed matter physics. Realization of topology as a generic …

In ultra-thin film topological insulators existence of substrate breaks the structural inversion
symmetry. The structure inversion asymmetry (SIA) can be modeled as effective potential V …

Magnetically doped topological insulators have been extensively studied over the past
decade as a material platform to exhibit quantum anomalous Hall effect. Most material …

This thesis explores the non-linear THz response of superconductors. Following the
discovery of lasers, optical non-linearity has been exploited to understand the fundamental …