QuEST Meeting 2026

QuEST Group Meeting 2026

Every Wed, 1300 - 1400 (Theoretical and Computational Physics Lab)

Presenter: Amsyar Rahim

Date: 7 January

Title: Light Matter Interaction

Abstract: In this meeting, we will discuss a tiny part of the massive field of light-matter interaction, focusing on the research during my 3-month visit in Center for Quantum Nanoscience (QNS), South Korea.

Presenter: Zain Ullah

Date: 4 March

Title: Localization-delocalization transition in the Generalized Aubry-Andr´e-Harper Model in a quasiperiodic superlattice potential

Abstract: We investigate localization-delocalization transition in the one-dimensional generalized Aubry-Andr´e-Harper (GAAH) model in a quasiperiodic superlattice potential. The critical interplay between the model’s two modulated energy scales—the hopping amplitude (t) and the on-site potential (Δ)—generates a rich phase diagram featuring extended, localized, and critical phases. We employ both static spectral and dynamics indicators to identify these phases. In static analysis, we compute the energy spectrum as a function of the common phase ϕ of the modulations and employ the inverse participation ratio (IPR) to map localization-delocalization phase diagram as a function of t and Δ. Dynamically, we model the evolution of an initially localized quantum state as a continuous-time quantum walk (CTQW), analyze the resulting probability distribution and time-dependent IPR to corroborate the static results. This work establishes a direct correspondence between static spectral indicators and dynamics, providing a unified framework for characterizing localization in quasiperiodic systems. Our findings offer new perspectives for controlling quantum transport in engineered quantum platforms.