Few-Electron Single and Double Quantum Dots in an InAs Two-Dimensional Electron Gas
| Autor: | Thomas Ihn, Jonne V. Koski, Geoffrey C. Gardner, Anthony Hatke, Candice Thomas, Christopher Mittag, Aymeric Tuaz, Matija Karalic, Klaus Ensslin, Jeroen Danon, Michael J. Manfra |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Condensed Matter - Mesoscale and Nanoscale Physics business.industry General Engineering FOS: Physical sciences Electron Quantum devices Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter::Materials Science chemistry.chemical_compound Semiconductor chemistry Quantum dot ComputerSystemsOrganization_MISCELLANEOUS Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Earth and Planetary Sciences Optoelectronics Indium arsenide Double quantum business General Environmental Science |
| Zdroj: | PRX Quantum |
| ISSN: | 2691-3399 |
| Popis: | Most proof-of-principle experiments for spin qubits have been performed with GaAs-based quantum dots because of the excellent control they offer over tunneling barriers and the orbital and spin degrees of freedom. Here we present the first realization of high-quality single and double quantum dots hosted in an InAs two-dimensional electron gas, demonstrating accurate control down to the few-electron regime, where we observe a clear Kondo effect and singlet-triplet spin blockade. We measure an electronic g factor of 16 and a typical magnitude of the random hyperfine fields on the quantum dots of approximately 0.6mT. We estimate the spin-orbit length in the system to be approximately 5−10μm (which is almost 2 orders of magnitude longer than typically measured in InAs nanostructures), achieved by a very symmetric design of the quantum well. These favorable properties put the InAs two-dimensional electron gas on the map as a compelling host for studying fundamental aspects of spin qubits. Furthermore, having weak spin-orbit coupling in a material with a large Rashba coefficient potentially opens up avenues for engineering structures with spin-orbit coupling that can be controlled locally in space and/or time. |
| Databáze: | OpenAIRE |
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