Gate-tunable Veselago interference in a bipolar graphene microcavity

Xi Zhang, Wei Ren, Elliot Bell, Ziyan Zhu, Kan-Ting Tsai, Yujie Luo, Kenji Watanabe, Takashi Taniguchi, Efthimios Kaxiras, Mitchell Luskin and Ke Wang ()
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Xi Zhang: University of Minnesota
Wei Ren: University of Minnesota
Elliot Bell: University of Minnesota
Ziyan Zhu: Harvard University
Kan-Ting Tsai: University of Minnesota
Yujie Luo: University of Minnesota
Kenji Watanabe: Research Center for Functional Materials, National Institute for Materials Science
Takashi Taniguchi: International Center for Materials Nanoarchitectonics, National Institute for Materials Science
Efthimios Kaxiras: Harvard University
Mitchell Luskin: University of Minnesota
Ke Wang: University of Minnesota

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract The relativistic charge carriers in monolayer graphene can be manipulated in manners akin to conventional optics. Klein tunneling and Veselago lensing have been previously demonstrated in ballistic graphene pn-junction devices, but collimation and focusing efficiency remains relatively low, preventing realization of advanced quantum devices and controlled quantum interference. Here, we present a graphene microcavity defined by carefully-engineered local strain and electrostatic fields. Electrons are manipulated to form an interference path inside the cavity at zero magnetic field via consecutive Veselago refractions. The observation of unique Veselago interference peaks via transport measurement and their magnetic field dependence agrees with the theoretical expectation. We further utilize Veselago interference to demonstrate localization of uncollimated electrons and thus improvement in collimation efficiency. Our work sheds new light on relativistic single-particle physics and provide a new device concept toward next-generation quantum devices based on manipulation of ballistic electron trajectory.

Date: 2022
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DOI: 10.1038/s41467-022-34347-w

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