Gate-tunable Veselago interference in a bipolar graphene microcavity

Zhang, Xi; Ren, Wei; Bell, Elliot; Zhu, Ziyan; Tsai, Kan-Ting; Luo, Yujie; Watanabe, Kenji; Taniguchi, Takashi; Kaxiras, Efthimios; Luskin, Mitchell; Wang, Ke

doi:10.1038/s41467-022-34347-w

Gate-tunable Veselago interference in a bipolar graphene microcavity

Journal Article · Sun Nov 06 23:00:00 EST 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-34347-w· OSTI ID:2006566

^[1]; Ren, Wei ^[2]; ^[2]; ^[3]; ^[2]; ^[2]; ^[4]; ^[4]; Kaxiras, Efthimios ^[5]; ^[2]; ^[2]

University of Minnesota, Minneapolis, MN (United States); SLAC
University of Minnesota, Minneapolis, MN (United States)
Harvard University, Cambridge, MA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)
Harvard University, Cambridge, MA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231

OSTI ID:: 2006566

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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