Scientific Achievement

Observed hydrodynamic plasmons and energy waves of a Dirac fluid in graphene using a new on-chip THz spectroscopy technique.

Significance and Impact

This study opens new opportunities to explore collective hydrodynamic excitations in low-dimensional materials.

Research Details

  • Used on-chip terahertz (THz) spectroscopy technique to measure the THz absorption spectra of a graphene micro-ribbon as well as the propagation of the energy wave in graphene close to charge neutrality.
  • Observed the anomalous dispersion behavior of the hydrodynamic plasmon
  • Revealed that heat can propagate as an energy wave in graphene with a characteristic speed of  𝑉_𝐹/√2.

Publication Details

W Zhao, S Wang, S Chen, Z Zhang, K Watanabe, T Taniguchi, A Zettl, F Wang Nature 614, 688–693 (2023).