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Orbitally Controlled Quantum Hall States in Decoupled Two‐Bilayer Graphene Sheets

Title
Orbitally Controlled Quantum Hall States in Decoupled Two‐Bilayer Graphene Sheets
Author(s)
Kim, SoyunKim, DohunWatanabe, KenjiTaniguchi, TakashiSmet, Jurgen H.Kim, Youngwook
Issued Date
2023-08
Citation
Advanced Science, v.10, no.23
Type
Article
Author Keywords
Bose-Einstein condensationfractional quantum Hall effectquantum Hall effecttwisted double bilayer graphene
Keywords
UNCONVENTIONAL SUPERCONDUCTIVITYBILAYERCONDENSATIONINTEGER
ISSN
2198-3844
Abstract
The authors report on integer and fractional quantum Hall states in a stack of two twisted Bernal bilayer graphene sheets. By exploiting the momentum mismatch in reciprocal space, the single-particle tunneling between both bilayers is suppressed. Since the bilayers are spatially separated by only 0.34 nm, the stack benefits from strong interlayer Coulombic interactions. These interactions can cause the formation of a Bose–Einstein condensate. Indeed, such a condensate is observed for half-filling in each bilayer sheet. However, only when the partially filled levels have orbital index 1. It is absent for partially filled levels with orbital index 0. This discrepancy is tentatively attributed to the role of skyrmion/anti-skyrmion pair excitations and the dependence of the energy of these excitations on the orbital index. The application of asymmetric top and bottom gate voltages enables to influence the orbital nature of the electronic states of the graphene bilayers at the chemical potential and to navigate in orbital mixed space. The latter hosts an even denominator fractional quantum Hall state at total filling of −3/2. These observations suggest a unique edge reconstruction involving both electrons and chiral p-wave composite fermions. © 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.
URI
http://hdl.handle.net/20.500.11750/45976
DOI
10.1002/advs.202300574
Publisher
Wiley
Related Researcher
  • 김영욱 Kim, Youngwook 화학물리학과
  • Research Interests Quantum Transport; Mesoscopic Physics
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Appears in Collections:
Department of Physics and Chemistry Topological Quantum Device Lab 1. Journal Articles

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