Resolving the Mechanism of Acoustic Plasmon Instability in Graphene Doped by Alkali Metals
Authors
Marušić, LeonardoKalinić, Ana
Radović, Ivan

Jakovac, Josip
Mišković, Zoran L.
Despoja, Vito

Article (Published version)
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Graphene doped by alkali atoms (ACx) supports two heavily populated bands (π and σ) crossing the Fermi level, which enables the formation of two intense two-dimensional plasmons: the Dirac plasmon (DP) and the acoustic plasmon (AP). Although the mechanism of the formation of these plasmons in electrostatically biased graphene or at noble metal surfaces is well known, the mechanism of their formation in alkali-doped graphenes is still not completely understood. We shall demonstrate that two isoelectronic systems, KC8 and CsC8, support substantially different plasmonic spectra: the KC8 supports a sharp DP and a well-defined AP, while the CsC8 supports a broad DP and does not support an AP at all. We shall demonstrate that the AP in an ACx is not, as previously believed, just a consequence of the interplay of the π and σ intraband transitions, but a very subtle interplay between these transitions and the background screening, caused by the out-of-plane interband C(π)→A(σ) transitions.
Keywords:
acoustic plasmon / EELS / graphene / graphene intercalation compounds / plasmonSource:
International Journal of Molecular Sciences, 2022, 23, 9, 4770-Funding / projects:
- Croatian Science Foundation [Grant No. IP-2020-02-5556]
- European Regional Development Fund for the ‘QuantiXLie Centre of Excellence’ [Grant No. KK.01.1.1.01.0004]
- Serbia–Croatia bilateral project [Grant No. 337-00-205/2019-09/28]
- Ministry of Education, Science and Technological Development of the Republic of Serbia
- Natural Sciences and Engineering Research Council of Canada [Grant No. 2016-03689]
DOI: 10.3390/ijms23094770
ISSN: 1422-0067
WoS: 00079532460000
Scopus: 2-s2.0-85128753465
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VinčaTY - JOUR AU - Marušić, Leonardo AU - Kalinić, Ana AU - Radović, Ivan AU - Jakovac, Josip AU - Mišković, Zoran L. AU - Despoja, Vito PY - 2022 UR - https://vinar.vin.bg.ac.rs/handle/123456789/10245 AB - Graphene doped by alkali atoms (ACx) supports two heavily populated bands (π and σ) crossing the Fermi level, which enables the formation of two intense two-dimensional plasmons: the Dirac plasmon (DP) and the acoustic plasmon (AP). Although the mechanism of the formation of these plasmons in electrostatically biased graphene or at noble metal surfaces is well known, the mechanism of their formation in alkali-doped graphenes is still not completely understood. We shall demonstrate that two isoelectronic systems, KC8 and CsC8, support substantially different plasmonic spectra: the KC8 supports a sharp DP and a well-defined AP, while the CsC8 supports a broad DP and does not support an AP at all. We shall demonstrate that the AP in an ACx is not, as previously believed, just a consequence of the interplay of the π and σ intraband transitions, but a very subtle interplay between these transitions and the background screening, caused by the out-of-plane interband C(π)→A(σ) transitions. T2 - International Journal of Molecular Sciences T1 - Resolving the Mechanism of Acoustic Plasmon Instability in Graphene Doped by Alkali Metals VL - 23 IS - 9 SP - 4770 DO - 10.3390/ijms23094770 ER -
@article{ author = "Marušić, Leonardo and Kalinić, Ana and Radović, Ivan and Jakovac, Josip and Mišković, Zoran L. and Despoja, Vito", year = "2022", abstract = "Graphene doped by alkali atoms (ACx) supports two heavily populated bands (π and σ) crossing the Fermi level, which enables the formation of two intense two-dimensional plasmons: the Dirac plasmon (DP) and the acoustic plasmon (AP). Although the mechanism of the formation of these plasmons in electrostatically biased graphene or at noble metal surfaces is well known, the mechanism of their formation in alkali-doped graphenes is still not completely understood. We shall demonstrate that two isoelectronic systems, KC8 and CsC8, support substantially different plasmonic spectra: the KC8 supports a sharp DP and a well-defined AP, while the CsC8 supports a broad DP and does not support an AP at all. We shall demonstrate that the AP in an ACx is not, as previously believed, just a consequence of the interplay of the π and σ intraband transitions, but a very subtle interplay between these transitions and the background screening, caused by the out-of-plane interband C(π)→A(σ) transitions.", journal = "International Journal of Molecular Sciences", title = "Resolving the Mechanism of Acoustic Plasmon Instability in Graphene Doped by Alkali Metals", volume = "23", number = "9", pages = "4770", doi = "10.3390/ijms23094770" }
Marušić, L., Kalinić, A., Radović, I., Jakovac, J., Mišković, Z. L.,& Despoja, V.. (2022). Resolving the Mechanism of Acoustic Plasmon Instability in Graphene Doped by Alkali Metals. in International Journal of Molecular Sciences, 23(9), 4770. https://doi.org/10.3390/ijms23094770
Marušić L, Kalinić A, Radović I, Jakovac J, Mišković ZL, Despoja V. Resolving the Mechanism of Acoustic Plasmon Instability in Graphene Doped by Alkali Metals. in International Journal of Molecular Sciences. 2022;23(9):4770. doi:10.3390/ijms23094770 .
Marušić, Leonardo, Kalinić, Ana, Radović, Ivan, Jakovac, Josip, Mišković, Zoran L., Despoja, Vito, "Resolving the Mechanism of Acoustic Plasmon Instability in Graphene Doped by Alkali Metals" in International Journal of Molecular Sciences, 23, no. 9 (2022):4770, https://doi.org/10.3390/ijms23094770 . .