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      Quantum-critical conductivity of the Dirac fluid in graphene

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          Abstract

          Graphene near charge neutrality is expected to behave like a quantum-critical, relativistic plasma—the "Dirac fluid"—in which massless electrons and holes rapidly collide at a rapid rate. We measure the frequency-dependent optical conductivity of clean, micron-scale graphene at electron temperatures between 77 and 300 K using on-chip terahertz spectroscopy. At charge neutrality, we observe the quantum-critical scattering rate characteristic of the Dirac fluid. At higher doping, we uncover 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.

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          Most cited references33

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          Theory of the Nernst effect near quantum phase transitions in condensed matter and in dyonic black holes

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            Photoexcitation cascade and multiple hot-carrier generation in graphene

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              Ultrafast optical switching of infrared plasmon polaritons in high-mobility graphene

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                Author and article information

                Journal
                Science
                Science
                American Association for the Advancement of Science (AAAS)
                0036-8075
                1095-9203
                February 28 2019
                : eaat8687
                Article
                10.1126/science.aat8687
                30819930
                5f050fb6-aa30-46ea-9150-58b767c9eac2
                © 2019
                History

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