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

4 Scopus citations

Abstract

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
Volume122
Issue number14
DOIs
StatePublished - Apr 10 2019

Bibliographical note

Funding Information:
We thank Boris Shklovskii, Amir Yacoby, Bertrand Halperin, Tony Low, and Roberto Grassi for helpful discussions. The major experimental work at Harvard University is supported by the U.S. Department of Energy (Grant No. DE-SC0012260). K.W. is supported by Army Research Office (ARO) Multidisciplinary University Research Initiative (MURI) (Grant No. W911NF-14-1-0247). P.K. acknowledges partial support from the Gordon and Betty Moore Foundations EPiQS Initiative (Grant No. GBMF4543). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the Ministry of Education, Culture, Sports, Science and Technology, Japan. T.T. acknowledges support from a Grant-in-Aid for Scientific Research (Grant No. 262480621) and a grant on Innovative Areas Nano Informatics (Grant No. 25106006) from the Japan Society for the Promotion of Science. This work was performed, in part, at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Infrastructure Network, which is supported by the NSF under Grant No. ECS-0335765. CNS is part of Harvard University. A part of device fabrication was done in Albany NanoTech Institute supported by the Semiconductor Research Corporations NRI Center for Institute for Nanoelectronics Discovery and Exploration (INDEX).

Funding Information:
We thank Boris Shklovskii, Amir Yacoby, Bertrand Halperin, Tony Low, and Roberto Grassi for helpful discussions. The major experimental work at Harvard University is supported by the U.S. Department of Energy (Grant No. DE-SC0012260). K. W. is supported by Army Research Office (ARO) Multidisciplinary University Research Initiative (MURI) (Grant No. W911NF-14-1-0247). P. K. acknowledges partial support from the Gordon and Betty Moore Foundations EPiQS Initiative (Grant No. GBMF4543). K. W. and T. T. acknowledge support from the Elemental Strategy Initiative conducted by the Ministry of Education, Culture, Sports, Science and Technology, Japan. T. T. acknowledges support from a Grant-in-Aid for Scientific Research (Grant No. 262480621) and a grant on Innovative Areas Nano Informatics (Grant No. 25106006) from the Japan Society for the Promotion of Science. This work was performed, in part, at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Infrastructure Network, which is supported by the NSF under Grant No. ECS-0335765. CNS is part of Harvard University. A part of device fabrication was done in Albany NanoTech Institute supported by the Semiconductor Research Corporations NRI Center for Institute for Nanoelectronics Discovery and Exploration (INDEX).

Publisher Copyright:
© 2019 American Physical Society.

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