Exciton transport in a germanium quantum dot ladder
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866910366481514496 |
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| author | 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. |
| author_facet | 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. |
| contents | 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$2 quantum dot array and show that the naturally occurring long-range Coulomb interaction can lead to exciton formation and transport. We tune the quantum dot ladder into two capacitively-coupled channels and exploit Coulomb drag to probe the binding of electrons and holes. Specifically, we shuttle an electron through one leg of the ladder and observe that a hole is dragged along in the second leg under the right conditions. This corresponds to a transition from single-electron transport in one leg to exciton transport along the ladder. Our work paves the way for the study of excitonic states of matter in quantum dot arrays. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_02401 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Exciton transport in a germanium quantum dot ladder Hsiao, T. -K. Fariña, P. Cova Oosterhout, S. D. Jirovec, D. Zhang, X. van Diepen, C. J. Lawrie, W. I. L. Wang, C. -A. Sammak, A. Scappucci, G. Veldhorst, M. Demler, E. Vandersypen, L. M. K. Mesoscale and Nanoscale Physics Quantum systems with engineered Hamiltonians can be used as simulators of many-body physics problems to provide insights beyond the capabilities of classical computers. Semiconductor gate-defined quantum dot arrays have emerged as a versatile platform for quantum simulation of generalized Fermi-Hubbard physics, one of the richest playgrounds in condensed matter physics. In this work, we employ a germanium 4$\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. |
| title | Exciton transport in a germanium quantum dot ladder |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2307.02401 |