The π∗-band renormalization of Li-doped quasifreestanding graphene has been investigated by means of isotope (C13) substitution and angle-resolved photoemission spectroscopy. The well documented sudden slope change (known as "kink") located at 169 meV from the Fermi level in the graphene made of C12 atoms shifts to 162 meV once the carbon monolayer is composed by C13 isotope. Such an energy shift is in excellent agreement with the expected softening of the phonon energy distribution due to the isotope substitution and provides, therefore, an indisputable experimental proof of the electron-phonon coupling origin of this well known many-body feature in the electronic structure of graphene.

Electron-phonon coupling origin of the graphene π∗ -band kink via isotope effect

Bisti F.
Writing – Original Draft Preparation
;
Profeta G.
Conceptualization
;
Ottaviano L.
Conceptualization
2021

Abstract

The π∗-band renormalization of Li-doped quasifreestanding graphene has been investigated by means of isotope (C13) substitution and angle-resolved photoemission spectroscopy. The well documented sudden slope change (known as "kink") located at 169 meV from the Fermi level in the graphene made of C12 atoms shifts to 162 meV once the carbon monolayer is composed by C13 isotope. Such an energy shift is in excellent agreement with the expected softening of the phonon energy distribution due to the isotope substitution and provides, therefore, an indisputable experimental proof of the electron-phonon coupling origin of this well known many-body feature in the electronic structure of graphene.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11697/159135
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