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Title: Infrared nano-imaging of Dirac magnetoexcitons in graphene

Journal Article · · Nature Nanotechnology
ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [1];  [2];  [2]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4];  [5]; ORCiD logo [4]; ORCiD logo [4];  [6];  [2]; ORCiD logo [2]; ORCiD logo [7]; ORCiD logo [8];  [9] more »; ORCiD logo [5];  [10]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [3] « less
  1. Stony Brook University, NY (United States); Columbia University, New York, NY (United States)
  2. Stony Brook University, NY (United States)
  3. Stony Brook University, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  4. Columbia University, New York, NY (United States)
  5. Université de Genève (Switzerland)
  6. Stony Brook University, NY (United States); University of California, Berkeley, CA (United States)
  7. Yale University, New Haven, CT (United States)
  8. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  9. Stony Brook University, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
  10. University of California at San Diego, La Jolla, CA (United States)

Magnetic fields can have profound effects on the motion of electrons in quantum materials. Two-dimensional electron systems subject to strong magnetic fields are expected to exhibit quantized Hall conductivity, chiral edge currents and distinctive collective modes referred to as magnetoplasmons and magnetoexcitons. Generating these propagating collective modes in charge-neutral samples and imaging them at their native nanometre length scales have thus far been experimentally elusive. Here we visualize propagating magnetoexciton polaritons at their native length scales and report their magnetic-field-tunable dispersion in near-charge-neutral graphene. Imaging these collective modes and their associated nano-electro-optical responses allows us to identify polariton-modulated optical and photo-thermal electric effects at the sample edges, which are the most pronounced near charge neutrality. Our work is enabled by innovations in cryogenic near-field optical microscopy techniques that allow for the nano-imaging of the near-field responses of two-dimensional materials under magnetic fields up to 7 T. In conclusion, this nano-magneto-optics approach allows us to explore and manipulate magnetopolaritons in specimens with low carrier doping via harnessing high magnetic fields.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF); Swiss National Science Foundation (SNSF)
Grant/Contract Number:
SC0012704; SC0019443; DMR-2045425; DMR-1808491; 200020_201096
OSTI ID:
2204612
Report Number(s):
BNL-224960-2023-JAAM
Journal Information:
Nature Nanotechnology, Vol. 18; ISSN 1748-3387
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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  • Keilmann, Fritz; Hillenbrand, Rainer
  • Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, Vol. 362, Issue 1817 https://doi.org/10.1098/rsta.2003.1347
journal April 2004
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