Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts
We report on the observation of quantum transport and interference in a graphene device that is attached with a pair of split gates to form an electrostatically-defined quantum point contact (QPC). In the low magnetic field regime, the resistance exhibited Fabry–Pérot (FP) resonances due to np’n(pn’...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Publishing Group
2019
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| Online Access: | http://eprints.utm.my/87797/1/NurulFarihaAhmad2019_FabryPerotResonancesandaCrossovertotheQuantumHall.pdf |
| _version_ | 1796864513332477952 |
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| author | Ahmad, Nurul Fariha Komatsu, Katsuyoshi Iwasaki, Takuya Watanabe, Kenji Taniguchi, Takashi Mizuta, Hiroshi Wakayama, Yutaka Hashim, Abdul Manaf Morita, Yoshifumi Moriyama, Satoshi Nakaharai, Shu |
| author_facet | Ahmad, Nurul Fariha Komatsu, Katsuyoshi Iwasaki, Takuya Watanabe, Kenji Taniguchi, Takashi Mizuta, Hiroshi Wakayama, Yutaka Hashim, Abdul Manaf Morita, Yoshifumi Moriyama, Satoshi Nakaharai, Shu |
| author_sort | Ahmad, Nurul Fariha |
| collection | ePrints |
| description | We report on the observation of quantum transport and interference in a graphene device that is attached with a pair of split gates to form an electrostatically-defined quantum point contact (QPC). In the low magnetic field regime, the resistance exhibited Fabry–Pérot (FP) resonances due to np’n(pn’p) cavities formed by the top gate. In the quantum Hall (QH) regime with a high magnetic field, the edge states governed the phenomena, presenting a unique condition where the edge channels of electrons and holes along a p–n junction acted as a solid-state analogue of a monochromatic light beam. We observed a crossover from the FP to QH regimes in ballistic graphene QPC under a magnetic field with varying temperatures. In particular, the collapse of the QH effect was elucidated as the magnetic field was decreased. Our high-mobility graphene device enabled observation of such quantum coherence effects up to several tens of kelvins. The presented device could serve as one of the key elements in future electronic quantum optic devices. |
| first_indexed | 2024-03-05T20:43:00Z |
| format | Article |
| id | utm.eprints-87797 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T20:43:00Z |
| publishDate | 2019 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | utm.eprints-877972020-11-30T13:20:51Z http://eprints.utm.my/87797/ Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts Ahmad, Nurul Fariha Komatsu, Katsuyoshi Iwasaki, Takuya Watanabe, Kenji Taniguchi, Takashi Mizuta, Hiroshi Wakayama, Yutaka Hashim, Abdul Manaf Morita, Yoshifumi Moriyama, Satoshi Nakaharai, Shu Q Science (General) T Technology (General) We report on the observation of quantum transport and interference in a graphene device that is attached with a pair of split gates to form an electrostatically-defined quantum point contact (QPC). In the low magnetic field regime, the resistance exhibited Fabry–Pérot (FP) resonances due to np’n(pn’p) cavities formed by the top gate. In the quantum Hall (QH) regime with a high magnetic field, the edge states governed the phenomena, presenting a unique condition where the edge channels of electrons and holes along a p–n junction acted as a solid-state analogue of a monochromatic light beam. We observed a crossover from the FP to QH regimes in ballistic graphene QPC under a magnetic field with varying temperatures. In particular, the collapse of the QH effect was elucidated as the magnetic field was decreased. Our high-mobility graphene device enabled observation of such quantum coherence effects up to several tens of kelvins. The presented device could serve as one of the key elements in future electronic quantum optic devices. Nature Publishing Group 2019-12-01 Article PeerReviewed application/pdf en http://eprints.utm.my/87797/1/NurulFarihaAhmad2019_FabryPerotResonancesandaCrossovertotheQuantumHall.pdf Ahmad, Nurul Fariha and Komatsu, Katsuyoshi and Iwasaki, Takuya and Watanabe, Kenji and Taniguchi, Takashi and Mizuta, Hiroshi and Wakayama, Yutaka and Hashim, Abdul Manaf and Morita, Yoshifumi and Moriyama, Satoshi and Nakaharai, Shu (2019) Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts. Scientific Reports, 9 (3031). ISSN 2045-2322 http://dx.doi.org/10.1038/s41598-019-39909-5 DOI:10.1038/s41598-019-39909-5 |
| spellingShingle | Q Science (General) T Technology (General) Ahmad, Nurul Fariha Komatsu, Katsuyoshi Iwasaki, Takuya Watanabe, Kenji Taniguchi, Takashi Mizuta, Hiroshi Wakayama, Yutaka Hashim, Abdul Manaf Morita, Yoshifumi Moriyama, Satoshi Nakaharai, Shu Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts |
| title | Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts |
| title_full | Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts |
| title_fullStr | Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts |
| title_full_unstemmed | Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts |
| title_short | Fabry–Pérot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts |
| title_sort | fabry perot resonances and a crossover to the quantum hall regime in ballistic graphene quantum point contacts |
| topic | Q Science (General) T Technology (General) |
| url | http://eprints.utm.my/87797/1/NurulFarihaAhmad2019_FabryPerotResonancesandaCrossovertotheQuantumHall.pdf |
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