Fabry-Perot resonances and a crossover to the quantum Hall regime in ballistic graphene quantum point contacts

被引：11

作者：

Ahmad, Nurul Fariha ^{[1
,2
]}

Komatsu, Katsuyoshi ^{[1
]}

Iwasaki, Takuya ^{[3
]}

Watanabe, Kenji ^{[4
]}

Taniguchi, Takashi ^{[4
]}

Mizuta, Hiroshi ^{[5
,6
]}

Wakayama, Yutaka ^{[1
]}

Hashim, Abdul Manaf ^{[2
]}

Morita, Yoshifumi ^{[7
]}

Moriyama, Satoshi ^{[1
]}

Nakaharai, Shu ^{[1
]}

机构：

[1] NIMS, Int Ctr Mat Nanoarchitecton WPI MANA, Tsukuba, Ibaraki 3050044, Japan

[2] Univ Teknol Malaysia, Malaysia Japan Int Inst Technol, Jalan SultanYahya Petra, Kuala Lumpur 54100, Malaysia

[3] NIMS, ICYS, Tsukuba, Ibaraki 3050044, Japan

[4] NIMS, Res Ctr Funct Mat, Tsukuba, Ibaraki 3050044, Japan

[5] Japan Adv Inst Sci & Technol, Sch Mat Sci, Nomi, Ishikawa 9231211, Japan

[6] Hitachi Europe Ltd, Hitachi Cambridge Lab, JJ Thomson Ave, Cambridge, England

[7] Gunma Univ, Fac Engn, Kiryu, Gunma 3768515, Japan

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

关键词：

P-N-JUNCTIONS; CONDUCTANCE; TRANSPORT;

D O I：

10.1038/s41598-019-39909-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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-Perot (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.

引用

页数：7

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