2D Topological Point and Line Emitters with Crystal-Clear Characteristics (TOPLINE)
Abstract
Despite the previous demonstrations of quantum emitters and some control of their properties, the relation between the structure, epitaxial growth and quantum emission characteristics of point and line defects in 2D transition metal dichalcogenides with broken symmetries (translational, time-reversal, space inversion and topological band structure) has not been elucidated. In this project, we aim to use molecular beam epitaxy of transition metal dichalcogenides and density functional theory to understand how the growth kinetics affects defect formation, defect type, and kinetic ordering of point and line defects on different substrates. This project has 5 objectives- (1) understanding how different point defect types, their densities, linewidths, emission lifetimes, and energy levels can be controlled using molecular beam epitaxy, (2) elucidating how line defects can be deterministically formed and their properties can be controlled on vicinal surfaces formed on substrates before growth, (3) developing multimode Ramsey-Rabi interferometry for identifying the chirality, valley index and wavelengths of photoemitted states, (4) designing and optimizing topological silicon photonic micro-ring resonators both experimentally and in computational electromagnetic finite-difference time-domain models for chiral-valley index mode-selective readout in separate micro-ring resonators, (5) establishing multimode excitation protocols for these defects such that information can be encoded in different valley indices, spins, and wavelengths. A new polarized quantum emitter excitation and readout protocol will be developed for understanding how the defect type affects the emission wavelength, linewidth, two-level system transition rates, relaxation times, lifetimes, photon correlations and statistics. By understanding the defect growth kinetics and their properties and by using the new excitation and readout protocol, qubit states might be encoded into higher orbital angular momenta, spin, and valley indices for quantum information processing.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 05, 2025
- Source ID
- FA86552417033
Entities
People
- Mehmet Onbasli
Organizations
- Air Force Office of Scientific Research
- United States Air Force