Kabyashree Sonowal

PCS IBS (PhD thesis Defense)

30 May 2023 Tue 4 pm

                                      IBS Center for Theoretical Physics of Complex Systems (PCS), Administrative Office (B349), Theory Wing, 3rd floor

                                      Expo-ro 55, Yuseong-gu, Daejeon, South Korea, 34126 Tel: +82-42-878-8633                     

We study charge carrier transport and resulting physical phenomena by accounting for two properties particular to two-dimensional systems, namely: (i) enhanced mechanical tunability to allow strain-induced transport phenomena using surface acoustic waves (SAW). We theoretically predict the existence of the valley acoustoelectric effect and valley spin acoustic resonance phenomena arising from the strain-lattice coupling. (ii) Increased influence of fluctuating Cooper pairs on transport properties due to lower dimensionality at temperatures slightly above the superconducting transition temperature. Our analysis of optical response phenomena like magnetoplasmon resonance, coherent photogalvanic effect, and second-harmonic generation in the fluctuating regime reveal significant modification of optical response due to strong influence of fluctuating Cooper pairs.

  1. acoustoelectric transport and optical response in fluctuating regime in 2d materials