Lifting of Spin Blockade by Charged Impurities in Si-MOS Double Quantum Dot Devices
Fuente:
arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2018
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| Soggetti: | |
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| _version_ | 1866929242742194176 |
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| author | King, Evelyn Schoenfield, Joshua S. Calderón, M. J. Koiller, Belita Saraiva, André Hu, Xuedong Jiang, HongWen Friesen, Mark Coppersmith, S. N. |
| author_facet | King, Evelyn Schoenfield, Joshua S. Calderón, M. J. Koiller, Belita Saraiva, André Hu, Xuedong Jiang, HongWen Friesen, Mark Coppersmith, S. N. |
| contents | One obstacle that has slowed the development of electrically gated metal-oxide-semiconductor (MOS) singlet-triplet qubits is the frequent lack of observed spin blockade, even in samples with large singlet-triplet energy splittings. We present theoretical and experimental evidence that the cause of this problem in MOS double quantum dots is the stray positive charges in the oxide inducing accidental levels near the device's active region that allow spin blockade lifting. We also present evidence that these effects can be mitigated by device design modifications, such as overlapping gates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1807_11064 |
| institution | arXiv |
| publishDate | 2018 |
| record_format | arxiv |
| spellingShingle | Lifting of Spin Blockade by Charged Impurities in Si-MOS Double Quantum Dot Devices King, Evelyn Schoenfield, Joshua S. Calderón, M. J. Koiller, Belita Saraiva, André Hu, Xuedong Jiang, HongWen Friesen, Mark Coppersmith, S. N. Mesoscale and Nanoscale Physics One obstacle that has slowed the development of electrically gated metal-oxide-semiconductor (MOS) singlet-triplet qubits is the frequent lack of observed spin blockade, even in samples with large singlet-triplet energy splittings. We present theoretical and experimental evidence that the cause of this problem in MOS double quantum dots is the stray positive charges in the oxide inducing accidental levels near the device's active region that allow spin blockade lifting. We also present evidence that these effects can be mitigated by device design modifications, such as overlapping gates. |
| title | Lifting of Spin Blockade by Charged Impurities in Si-MOS Double Quantum Dot Devices |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/1807.11064 |