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Title: Electronic interactions in Dirac fluids visualized by nano-terahertz spacetime interference of electron-photon quasiparticles

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [8];  [1]
  1. Columbia Univ., New York, NY (United States)
  2. Columbia Univ., New York, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
  3. Columbia Univ., New York, NY (United States); Stony Brook Univ., NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
  4. Columbia Univ., New York, NY (United States); Univ. of Maryland, College Park, MD (United States)
  5. Univ. of Washington, Seattle, WA (United States)
  6. Columbia Univ., New York, NY (United States); Flatiron Institute, New York, NY (United States)
  7. Univ. of California, San Diego, CA (United States)
  8. Stony Brook Univ., NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

Ultraclean graphene at charge neutrality hosts a quantum critical Dirac fluid of interacting electrons and holes. Interactions profoundly affect the charge dynamics of graphene, which is encoded in the properties of its electron-photon collective modes: surface plasmon polaritons (SPPs). Here, we show that polaritonic interference patterns are particularly well suited to unveil the interactions in Dirac fluids by tracking polaritonic interference in time at temporal scales commensurate with the electronic scattering. Spacetime SPP interference patterns recorded in terahertz (THz) frequency range provided unobstructed readouts of the group velocity and lifetime of polariton that can be directly mapped onto the electronic spectral weight and the relaxation rate. Our data uncovered prominent departures of the electron dynamics from the predictions of the conventional Fermi-liquid theory. The deviations are particularly strong when the densities of electrons and holes are approximately equal. The proposed spacetime imaging methodology can be broadly applied to probe the electrodynamics of quantum materials.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC0018426; SC0019443
OSTI ID:
2477950
Report Number(s):
BNL--226351-2024-JAAM
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 43 Vol. 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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