| Description: | [DPS Seminar] Dr Bidisha Roy (Walter Schottky Insititute, Technical University of Munich) -- Some interesting optical manifestations in quantum confined excitonic systems |
| Date: | Wednesday, Oct 03, 2018 |
| Time: | 3 p.m. - 4 p.m. |
| Venue: | G02, Lecture Hall Complex |
| Details: | Optical and magneto-optical studies of excitons in a cylindrically stacked system of semiconductor quantum dots with type-II band alignment will be discussed in the first part, particularly addressing the intriguing observation of excitonic Aharonov- Bohm (AB) effect in these systems which gets revealed through magneto-photoluminescence (PL) emission. The AB signature indicated presence of built-in electric field in the system and a detailed spectral analysis of this otherwise purely quantum mechanical effect could lead to the determination of lateral excitonic size with up to sub-nanometer precision. In this light, I will also discuss the decoherence mechanisms in such quantum confined systems. In a second part, we will look at a plasmonic- semiconductor hybrid system of interest that enabled the tuning and manipulation of optical emission from an overlaid monolayer of two-dimensional transition metal di-Chalcogenide (2D TMDC) semiconductor material. Here I will discuss how the geometry-dependent plasmonic resonance of a nanoplasmonic array could induce a significant degree of linear polarization to the optical emission from an otherwise unpolarized atomically thin excitonic emitter at room temperature. The key factors governing such functional light-matter interactions in low dimensional semiconductor excitonic systems relevant to novel fundamental and applied interests will be the general intent of this talk. |
| Calendar: | Seminar Calendar (entered by ipsita.banerjee) |