Quantum-critical conductivity of the Dirac fluid in graphene

Science
Patrick GallagherFeng Wang

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.

References

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Mar 14, 2018·Proceedings of the National Academy of Sciences of the United States of America·Zhiyuan SunMichael M Fogler
Mar 2, 2019·Science·Patrick GallagherFeng Wang

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Citations

Nov 26, 2019·Physical Review Letters·Egor I Kiselev, Jörg Schmalian
Apr 30, 2021·Nanoscale·Mathieu MassicotteKlaas-Jan Tielrooij
Apr 13, 2019·Science·Andrew Lucas
Nov 2, 2021·Advanced Science·Mengya LiuGui Yu
Mar 2, 2019·Science·Patrick GallagherFeng Wang
Nov 5, 2021·Nano Letters·Sayanti SamaddarMarkus Morgenstern
Aug 25, 2021·Nature Nanotechnology·Alexander BlockKlaas-Jan Tielrooij
Jan 28, 2022·Science·Alexey I BerdyuginA K Geim

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