Academy of Finland  
Funding decision
Organisation Aalto University
Project title Excitations and frustration in topologically restricted quantum systems
Applicant / Contact person Hakonen, Pertti
Decision No. 341913
Decision date 03.06.2021
Funding period 01.09.2021 - 31.08.2025
Funding 497 280
Project description
Low-dimensional systems facilitate various types of topologically stabilized excitations, such as fractionalized particles, carriers on edge states, composite fermions etc. Among different kinds of low-dimensional structures, a carbon nanotube (CNT) presents an excellent example of a substrate on which topological defects in an adsorbed atomic helium layer can be created and stabilized into a quasi-2D solid. The finite amount of point defects, vacancies, are stable down to zero temperature, because these vacancies are due to topologically induced frustration, i.e. due to mismatch between the chiral CNT lattice and the superlattice structure of the adsorbed helium that favors the 1/3 filling of the graphite lattice. In this project we investigate the implications of topologically induced defects in helium-CNT systems. We will investigate the mobility of defects on the chiral CNT substrate and engineer our setting so that the theoretically-anticipated supersolidity will be observed.