Coulomb oscillations of a quantum antidot formed by an airbridged pillar gate in the integer and fractional quantum Hall regime
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916525367099392 |
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| author | Hata, Tokuro Mitani, Hiroki Uchiyama, Hidetaka Akiho, Takafumi Muraki, Koji Fujisawa, Toshimasa |
| author_facet | Hata, Tokuro Mitani, Hiroki Uchiyama, Hidetaka Akiho, Takafumi Muraki, Koji Fujisawa, Toshimasa |
| contents | Quantum antidots (QAD) are attractive for manipulating quasiparticles in quantum Hall (QH) systems. Here, we form a QAD in the integer and fractional QH regimes at nominal Landau-level filling factor $ν$ = 2, 1, and 2/3 using a submicron pillar gate with an airbridge connection. After confirming the required conditions for a fully depleted QAD, we analyze the observed Coulomb oscillations in terms of the area of the QAD and the effective charge for the oscillation period in an identical gate voltage range. The area at $ν$ = 2/3 is significantly smaller than that at $ν$ = 2 and 1, in qualitative agreement with the previous report. By assuming a constant gate capacitance, the effective charge at $ν$ = 2/3 is about 2/3 of that at $ν$ = 2 and 1. The QAD device can be used to capture and emit charges in the unit of 2e/3. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_11401 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coulomb oscillations of a quantum antidot formed by an airbridged pillar gate in the integer and fractional quantum Hall regime Hata, Tokuro Mitani, Hiroki Uchiyama, Hidetaka Akiho, Takafumi Muraki, Koji Fujisawa, Toshimasa Mesoscale and Nanoscale Physics Quantum antidots (QAD) are attractive for manipulating quasiparticles in quantum Hall (QH) systems. Here, we form a QAD in the integer and fractional QH regimes at nominal Landau-level filling factor $ν$ = 2, 1, and 2/3 using a submicron pillar gate with an airbridge connection. After confirming the required conditions for a fully depleted QAD, we analyze the observed Coulomb oscillations in terms of the area of the QAD and the effective charge for the oscillation period in an identical gate voltage range. The area at $ν$ = 2/3 is significantly smaller than that at $ν$ = 2 and 1, in qualitative agreement with the previous report. By assuming a constant gate capacitance, the effective charge at $ν$ = 2/3 is about 2/3 of that at $ν$ = 2 and 1. The QAD device can be used to capture and emit charges in the unit of 2e/3. |
| title | Coulomb oscillations of a quantum antidot formed by an airbridged pillar gate in the integer and fractional quantum Hall regime |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2412.11401 |