Quantum Lifetime Spectroscopy and Magnetotunneling in Double Bilayer Graphene Heterostructures

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Date

2021-08-04

Authors

Prasad, Nitin
Burg, William G.
Watanabe, Kenji
Taniguchi, Takashi
Register, Leonard F.
Tutuc, Emanuel

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Abstract

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 quasi-particle 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.

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