Tunneling Spectroscopy of Quantum Hall States in Bilayer Graphene p–n Junctions

Wang, Ke; Harzheim, Achim; Taniguchi, Takashi; Watanabei, Kenji; Lee, Ji Ung; Kim, Philip

doi:10.1103/physrevlett.122.146801

Title: Tunneling Spectroscopy of Quantum Hall States in Bilayer Graphene p–n Junctions

Journal Article · Wed Apr 10 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.146801· OSTI ID:1611749

Wang, Ke ^[1]; Harzheim, Achim ^[2]; Taniguchi, Takashi ^[3]; Watanabei, Kenji ^[3]; Lee, Ji Ung ^[4]; Kim, Philip ^[2]

Harvard Univ., Cambridge, MA (United States); Univ. of Minnesota, Minneapolis, MN (United States)
Harvard Univ., Cambridge, MA (United States)
National Inst. for Materials Science, Ibaraki (Japan)
SUNY Polytechnic Institute, Albany, NY (United States)

We report tunneling transport in spatially controlled networks of quantum Hall (QH) edge states in bilayer graphene. By manipulating the separation, location, and spatial span of QH edge states via gate-defined electrostatics, we observe resonant tunneling between copropagating QH states across incompressible strips. Employing spectroscopic tunneling measurements and an analytical model, we characterize the energy gap, width, density of states, and compressibility of the QH edge states with high precision and sensitivity within the same device. Furthermore, the capability to engineer the QH edge network also provides an opportunity to build future quantum electronic devices with electrostatic manipulation of QH edge states, supported by rich underlying physics.

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Research Organization:: Harvard Univ., Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0012260

OSTI ID:: 1611749

Alternate ID(s):: OSTI ID: 1506169

Journal Information:: Physical Review Letters, Vol. 122, Issue 14; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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