Optically Tunable Many‐Body Exciton‐Phonon Quantum Interference
Journal
Advanced Science
ISSN
2198-3844
2198-3844
Date Issued
2024-08-29
Author(s)
Si‐Jie Chang
Po‐Chun Huang
Jia‐Sian Su
Carlos Jose Quiroz Reyes
Ting‐Hsuan Fan
Han‐Sheng Sun
Ai‐Phuong Nguyem
Te‐I Liu
Ho‐Wen Cheng
Ching‐Wei Lin
Abstract
This study introduces a novel paradigm for achieving widely tunable many-body Fano quantum interference in low-dimensional semiconducting nanostructures, beyond the conventional requirement of closely matched energy levels between discrete and continuum states observed in atomic Fano systems. Leveraging Floquet engineering, the remarkable tunability of Fano lineshapes is demonstrated, even when the original discrete and continuum states are separated by over 1 eV. Specifically, by controlling the quantum pathways of discrete phonon Raman scattering using femtosecond laser pulses, the Raman intermediate states across the excitonic Floquet band are tuned. This manipulation yields continuous transitions of Fano lineshapes from antiresonance to dispersive and to symmetric Lorentzian profiles, accompanied by significant variations in Fano parameter q and Raman intensity spanning 2 orders of magnitude. A subtle shift in the excitonic Floquet resonance is further shown, achieved by controlling the intensity of the femtosecond laser, which profoundly modifies quantum interference strength from destructive to constructive interference. The study reveals the crucial roles of Floquet engineering in coherent light-matter interactions and opens up new avenues for coherent control of Fano quantum interference over a broad energy spectrum in low-dimensional semiconducting nanostructures.
Subjects
fano resonance; floquet state; low-dimensional semiconductors; optical manipulation; quantum interference
SDGs
Publisher
Wiley
Type
journal article