Periodic Reporting for period 3 - E-DESIGN (Artificial designer materials)
Reporting period: 2021-09-01 to 2023-02-28
This project is about constructing designer materials where the atomic geometry, interactions, magnetism and other relevant parameters can be precisely controlled. This will be achieved by positioning every atom with the tip of a scanning probe microscope, or by using molecular self-assembly to reach the desired structures. The aim is to realize and engineer several novel quantum materials hosting exotic electronic phases: 2D topological insulators superconductors in hybrid organic-inorganic structures. These classes of materials have not yet been experimentally realized but could enable novel spintronic and quantum computing devices. In addition, we will attempt to realize a tuneable platform for quantum simulation in solid-state artificial lattices, which could open a whole new area in this field.
The artificial designer materials we study are characterized by the engineered electronic response with atomically precise geometries, lattice symmetries and controlled interactions. Such ingredients can result in ultimately controllable materials that have large, robust and quick responses to small stimuli with applications in nanoelectronics, flexible electronics, high-selectivity and high-sensitivity sensors, and optoelectronic components. Longer term, the biggest impact is expected through a profound change in the way we view materials and what can be achieved through designer materials approach.
The artificial designer materials we study are characterized by the engineered electronic response with atomically precise geometries, lattice symmetries and controlled interactions. Such ingredients can result in ultimately controllable materials that have large, robust and quick responses to small stimuli with applications in nanoelectronics, flexible electronics, high-selectivity and high-sensitivity sensors, and optoelectronic components. Longer term, the biggest impact is expected through a profound change in the way we view materials and what can be achieved through designer materials approach.
The project consists of 4 work packages (WPs) and the main emphasis is realizing exotic electronic states in organic-inorganic hybrids, magnet-superconductor structures, and atomic lattices. So far, we have achieved significant advances in the synthesis of metal-organic frameworks (MOFs) on weakly interacting substrates (Nano Lett. 2018, ChemPhysChem 2019, Adv. Funct. Mater. 2021, arXiv:2110.13503). We have also demonstrated the formation of topological states and flat bands in 1D atomic lattices (npj Quant. Mater. 2020, Phys. Rev. Research 2020).
Finally, we have achieved breakthrough results on combining monolayer ferromagnets (VSe2, CrBr3) with superconducting substrates with the aim of realizing topological superconductivity ("Topological superconductivity in a van der Waals heterostructure", Nature 588, 424-428 (2020)). We have continued the work on van der Waals heterostructures and realized an artificial heavy fermion system in 1T/1H-TaS2 vertical heterostructure (accepted for publication in Nature, arXiv:2103.11989).
Finally, we have achieved breakthrough results on combining monolayer ferromagnets (VSe2, CrBr3) with superconducting substrates with the aim of realizing topological superconductivity ("Topological superconductivity in a van der Waals heterostructure", Nature 588, 424-428 (2020)). We have continued the work on van der Waals heterostructures and realized an artificial heavy fermion system in 1T/1H-TaS2 vertical heterostructure (accepted for publication in Nature, arXiv:2103.11989).
The aim of this project is to experimentally realize completely new platforms for artificial quantum materials with engineered electronic properties. The central outcomes of the project are all expected to go significantly beyond the experimental state-of-the-art: demonstrate (1) organic 2D topological insulators in metal-organic frameworks; (2) 2D topological superconductors in hybrid magnet-superconductor structures; and (3) realize a new, tuneable, platform for quantum simulation in solid-state artificial lattices. Reaching these goals would enable electrical devices with completely new operational principles. In addition, from a fundamental point of view, realization of maximally tuneable 2D organic topological insulators and superconductors would be a major breakthrough in condensed-matter physics and materials science.