Quantum Lifetime Spectroscopy and Magnetotunneling in Double Bilayer Graphene Heterostructures

We describe a tunneling spectroscopy technique in a double bilayer graphene heterostructure where momentum-conserving tunneling between different energy bands serves as an energy filter for the tunneling carriers, and allows a measurement of the quasiparticle state broadening at well-defined energie...

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Bibliographic Details
Published in:Physical review letters 2021-09, Vol.127 (11), p.1-117701, Article 117701
Main Authors: Prasad, Nitin, Burg, G. William, Watanabe, Kenji, Taniguchi, Takashi, Register, Leonard F., Tutuc, Emanuel
Format: Article
Language:English
Subjects:
Bilayers
Elementary excitations
Energy bands
Graphene
Heterostructures
Momentum
Spectroscopy
Spectrum analysis
Temperature dependence
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Summary:We describe a tunneling spectroscopy technique in a double bilayer graphene heterostructure where momentum-conserving tunneling between different energy bands serves as an energy filter for the tunneling carriers, and allows a measurement of the quasiparticle state broadening at well-defined energies. The broadening increases linearly with the excited state energy with respect to the Fermi level and is weakly dependent on temperature. In-plane magnetotunneling reveals a high degree of rotational alignment between the graphene bilayers, and an absence of momentum randomizing processes.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.117701