Control of Raman scattering quantum interference pathways in graphene

Graphene is an ideal platform to study the coherence of quantum interference pathways by tuning doping or laser excitation energy. The latter produces a Raman excitation profile that provides direct insight into the lifetimes of intermediate electronic excitations and, therefore, on quantum interfer...

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Bibliographic Details
Published in:arXiv.org 2023-01
Main Authors: Chen, Xue, Reichardt, Sven, Miao-Ling, Lin, Yu-Chen, Leng, Lu, Yan, Wu, Heng, Mei, Rui, Wirtz, Ludger, Zhang, Xin, Ferrari, Andrea C, Ping-Heng, Tan
Format: Article
Language:English
Subjects:
Doping
Excitation
Graphene
Interference
Raman spectra
Topological insulators
Tuning
Online Access:Get full text
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Summary:Graphene is an ideal platform to study the coherence of quantum interference pathways by tuning doping or laser excitation energy. The latter produces a Raman excitation profile that provides direct insight into the lifetimes of intermediate electronic excitations and, therefore, on quantum interference, which has so far remained elusive. Here, we control the Raman scattering pathways by tuning the laser excitation energy in graphene doped up to 1.05eV, above what achievable with electrostatic doping. The Raman excitation profile of the G mode indicates its position and full width at half maximum are linearly dependent on doping. Doping-enhanced electron-electron interactions dominate the lifetime of Raman scattering pathways, and reduce Raman interference. This paves the way for engineering quantum pathways in doped graphene, nanotubes and topological insulators.
ISSN:2331-8422