We demonstrate a quantum Hall edge-channel interferometer in a high-quality graphene pn junction under a high magnetic field. The co-propagating p and n quantum Hall edge channels traveling along the pn interface functions as a built-in Aharonov-Bohm-type interferometer, the interferences in which are sensitive to both the external magnetic field and the carrier concentration. The trajectories of peak and dip in the observed resistance oscillation are well reproduced by our numerical calculation that assumes magnetic flux quantization in the area enclosed by the co-propagating edge channels. Coherent nature of the co-propagating edge channels is confirmed by the checkerboard-like pattern in the dc-bias and magnetic-field dependences of the resistance oscillations.
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4 May 2015
Research Article|
May 04 2015
Edge-channel interferometer at the graphene quantum Hall pn junction
Sei Morikawa;
Sei Morikawa
1Institute of Industrial Science,
University of Tokyo
, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
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Satoru Masubuchi;
Satoru Masubuchi
a)
1Institute of Industrial Science,
University of Tokyo
, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
2Institute for Nano Quantum Information Electronics,
University of Tokyo
, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
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Rai Moriya
;
Rai Moriya
1Institute of Industrial Science,
University of Tokyo
, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
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Kenji Watanabe
;
Kenji Watanabe
3
National Institute for Materials Science
, 1-1 Namiki, Tsukuba 305-0044, Japan
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Takashi Taniguchi;
Takashi Taniguchi
3
National Institute for Materials Science
, 1-1 Namiki, Tsukuba 305-0044, Japan
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Tomoki Machida
Tomoki Machida
b)
1Institute of Industrial Science,
University of Tokyo
, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
2Institute for Nano Quantum Information Electronics,
University of Tokyo
, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan
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a)
E-mail: [email protected]
b)
E-mail: [email protected]
Appl. Phys. Lett. 106, 183101 (2015)
Article history
Received:
March 02 2015
Accepted:
March 26 2015
Citation
Sei Morikawa, Satoru Masubuchi, Rai Moriya, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida; Edge-channel interferometer at the graphene quantum Hall pn junction. Appl. Phys. Lett. 4 May 2015; 106 (18): 183101. https://doi.org/10.1063/1.4919380
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