Journal
NANOSCALE
Volume 10, Issue 46, Pages 21918-21927Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr05502e
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Funding
- Italian Ministry of Education and Research (MIUR) under project Beyond-Nano [PON a3_00363]
- Thousand Young Talent Plan (China)
- European Research Council Advanced Grant program [338957]
- US Department of Energy [DE-SC0014208]
- FLAG-ERA JTC2017 Project GRANSPORT
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By means of momentum-resolved electron energy loss spectroscopy (EELS) coupled with scanning transmission electron microscopy, we have studied the dispersion relation of interband plasmonic modes in the ultraviolet in black phosphorus. We find that the dispersion of the interband plasmons is anisotropic. Experimental results are reproduced by density functional theory, by taking into account both the anisotropy of the single-particle response function, arising from the anisotropic band structure, and the damping. Moreover, our theoretical model also indicates the presence of low-energy excitations in the near-infrared that are selectively active in the armchair direction, whose existence has been experimentally validated by high-resolution EELS (HREELS) in reflection mode.
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