Exciton transport in a germanium quantum dot ladder
| Autor: | Hsiao, T. -K., Fariña, P. Cova, Oosterhout, S. D., Jirovec, D., Zhang, X., van Diepen, C. J., Lawrie, W. I. L., Wang, C. -A., Sammak, A., Scappucci, G., Veldhorst, M., Demler, E., Vandersypen, L. M. K. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. X 14, 011048 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevX.14.011048 |
| Popis: | Quantum systems with engineered Hamiltonians can be used as simulators of 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 quantum simulation of generalized Fermi-Hubbard physics, one of the richest playgrounds in condensed matter physics. In this work, we employ a germanium 4$\times$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. Comment: 15 pages and 13 figures |
| Databáze: | arXiv |
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