Quantum-critical conductivity of the Dirac fluid in graphene

Patrick Gallagher, Chan Shan Yang, Tairu Lyu, Fanglin Tian, Rai Kou, Hai Zhang, Kenji Watanabe, Takashi Taniguchi, Feng Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Graphene near charge neutrality is expected to behave like a quantum-critical, relativistic plasma-the "Dirac fluid"-in which massless electrons and holes collide at a rapid rate. We used on-chip terahertz spectroscopy to measure the frequency-dependent optical conductivity of clean, micrometer-scale graphene at electron temperatures between 77 and 300 kelvin. At charge neutrality, we observed the quantum-critical scattering rate characteristic of the Dirac fluid. At higher doping, we detected two distinct current-carrying modes with zero and nonzero total momenta, a manifestation of relativistic hydrodynamics. Our work reveals the quantum criticality and unusual dynamic excitations near charge neutrality in graphene.

Original languageEnglish
Pages (from-to)158-162
Number of pages5
JournalScience
Volume364
Issue number6436
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • General

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