Tunneling spectroscopy of quantum hall states in bilayer graphene p-n junctions

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

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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. 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.

Original languageEnglish (US)
Article number146801
JournalPhysical review letters
Issue number14
StatePublished - Apr 10 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 American Physical Society.


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