Observation of a Luttinger-liquid plasmon in metallic single-walled carbon nanotubes
- Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- National Inst. for Materials Science (NIMS), Tsukuba (Japan). Advanced Materials Laboratory
- Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
- Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Kavli Energy NanoScience Institute, Berkeley, CA (United States)
Surface plasmons, collective oscillations of conduction electrons, hold great promise for the nanoscale integration of photonics and electronics. However, nanophotonic circuits based on plasmons have been significantly hampered by the difficulty in achieving broadband plasmonic waveguides that simultaneously exhibit strong spatial confinement, a high quality factor and low dispersion. Quantum plasmons, where the quantum mechanical effects of electrons play a dominant role, such as plasmons in very small metal nanoparticles and plasmons affected by tunnelling effects, can lead to novel plasmonic phenomena in nanostructures. Here, we show that a Luttinger liquid of one-dimensional Dirac electrons in carbon nanotubes exhibits quantum plasmons that behave qualitatively differently from classical plasmon excitations. The Luttinger-liquid plasmons propagate at ‘quantized’ velocities that are independent of carrier concentration or excitation wavelength, and simultaneously exhibit extraordinary spatial confinement and high quality factor. Such Luttinger-liquid plasmons could enable novel low-loss plasmonic circuits for the subwavelength manipulation of light.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-05CH11231; SC0003949; DMR-1404865
- OSTI ID:
- 1642663
- Journal Information:
- Nature Photonics, Vol. 9, Issue 8; ISSN 1749-4885
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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