Anisotropic ultraviolet-plasmon dispersion in black phosphorus

G. Nicotra; E. Van Veen; I. Deretzis; L. Wang; J. Hu; Z. Mao; V. Fabio; C. Spinella; G. Chiarello; A. Rudenko; S. Yuan; A. Politano

doi:10.1039/c8nr05502e

Anisotropic ultraviolet-plasmon dispersion in black phosphorus

G. Nicotra, E. Van Veen, I. Deretzis, L. Wang, J. Hu, Z. Mao, V. Fabio, C. Spinella, G. Chiarello, A. Rudenko, S. Yuan, A. Politano

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Abstract

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. \ 2018 The Royal Society of Chemistry.

Original language	English
Pages (from-to)	21918-21927
Number of pages	10
Journal	Nanoscale
Volume	10
Issue number	46
DOIs	https://doi.org/10.1039/c8nr05502e
State	Published - 2018

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title = "Anisotropic ultraviolet-plasmon dispersion in black phosphorus",

abstract = "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. \ 2018 The Royal Society of Chemistry.",

author = "G. Nicotra and {Van Veen}, E. and I. Deretzis and L. Wang and J. Hu and Z. Mao and V. Fabio and C. Spinella and G. Chiarello and A. Rudenko and S. Yuan and A. Politano",

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T1 - Anisotropic ultraviolet-plasmon dispersion in black phosphorus

AU - Nicotra, G.

AU - Van Veen, E.

AU - Deretzis, I.

AU - Wang, L.

AU - Hu, J.

AU - Mao, Z.

AU - Fabio, V.

AU - Spinella, C.

AU - Chiarello, G.

AU - Rudenko, A.

AU - Yuan, S.

AU - Politano, A.

N1 - cited By 0

PY - 2018

Y1 - 2018

N2 - 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. \ 2018 The Royal Society of Chemistry.

AB - 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. \ 2018 The Royal Society of Chemistry.

U2 - 10.1039/c8nr05502e

DO - 10.1039/c8nr05502e

M3 - Article

C2 - 30457626

SN - 2040-3364

VL - 10

SP - 21918

EP - 21927

JO - Nanoscale

JF - Nanoscale

IS - 46

ER -

Anisotropic ultraviolet-plasmon dispersion in black phosphorus

Abstract

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