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Phys Rev Lett. 2017 Oct 13;119(15):156803. doi: 10.1103/PhysRevLett.119.156803. Epub 2017 Oct 13.

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

Cheng G1,2, Qin W1, Lin MH3, Wei L1,2, Fan X1,2, Zhang H1,2, Gwo S3,4, Zeng C1,2, Hou JG1, Zhang Z1.

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International Center for Quantum Design of Functional Materials (ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan.
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan.


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.

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