Substantially Enhancing Quantum Coherence of Electrons in Graphene via Electron-Plasmon Coupling

Guanghui Cheng, Wei Qin, Meng Hsien Lin, Laiming Wei, Xiaodong Fan, Huayang Zhang, Shangjr Gwo, Changgan Zeng, J. G. Hou, Zhenyu Zhang

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


The interplays between different quasiparticles in solids lay the foundation for a wide spectrum of intriguing quantum effects, yet how the collective plasmon excitations affect the quantum transport of electrons remains largely unexplored. Here we provide the first demonstration that when the electron-plasmon coupling is introduced, the quantum coherence of electrons in graphene is substantially enhanced with the quantum coherence length almost tripled. We further develop a microscopic model to interpret the striking observations, emphasizing the vital role of the graphene plasmons in suppressing electron-electron dephasing. The novel and transformative concept of plasmon-enhanced quantum coherence sheds new insight into interquasiparticle interactions, and further extends a new dimension to exploit nontrivial quantum phenomena and devices in solid systems.

Original languageEnglish
Article number156803
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 2017 Oct 13


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