Year: 2024
Type: article
Abstract: Quantum systems with engineered Hamiltonians can be used to study many-body physics problems to provide insights beyond the capabilities of classical computers.Semiconductor gate-defined quantum dot arrays have emerged as a versatile platform for realizing generalized Fermi-Hubbard physics, one of the richest playgrounds in condensed matter physics.In this work, we employ a germanium 4 × 2 quantum dot array and show that the naturally occurring long-range Coulomb interaction can lead to exciton formation and transport.We tune the quantum dot ladder into two capacitively coupled channels and exploit Coulomb drag to probe the binding of electrons and holes.Specifically, we shuttle an electron through one leg of the ladder and observe that a hole is dragged along in the second leg under the right conditions.This corresponds to a transition from single-electron transport in one leg to exciton transport along the ladder.Our work paves the way for the study of excitonic states of matter in quantum dot arrays.
Source: Physical Review X
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,200
Funders: European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Stichting Nederlands Oogheelkundig Onderzoek, Staatssekretariat für Bildung, Forschung und Innovation, Army Research Office, H2020 European Research Council
OpenAlex ID: W4392804663