• 文献标题:   Tuning quantum nonlocal effects in graphene plasmonics
  • 文献类型:   Article
  • 作  者:   LUNDEBERG MB, GAO YD, ASGARI R, TAN C, VAN DUPPEN B, AUTORE M, ALONSOGONZALEZ P, WOESSNER A, WATANABE K, TANIGUCHI T, HILLENBRAND R, HONE J, POLINI M, KOPPENS FHL
  • 作者关键词:  
  • 出版物名称:   SCIENCE
  • ISSN:   0036-8075 EI 1095-9203
  • 通讯作者地址:   Barcelona Inst Sci Technol
  • 被引频次:   62
  • DOI:   10.1126/science.aan2735
  • 出版年:   2017

▎ 摘  要

The response of electron systems to electrodynamic fields that change rapidly in space is endowed by unique features, including an exquisite spatial nonlocality. This can reveal much about the materials' electronic structure that is invisible in standard probes that use gradually varying fields. Here, we use graphene plasmons, propagating at extremely slow velocities close to the electron Fermi velocity, to probe the nonlocal response of the graphene electron liquid. The near-field imaging experiments reveal a parameter-free match with the full quantum description of the massless Dirac electron gas, which involves three types of nonlocal quantum effects: single-particle velocity matching, interaction-enhanced Fermi velocity, and interaction-reduced compressibility. Our experimental approach can determine the full spatiotemporal response of an electron system.