Massive and massless plasmons in germanene nanosheets
Abstract Atomically thin crystals may exhibit peculiar dispersive electronic states equivalent to free charged particles of ultralight to ultraheavy masses. A rare coexistence of linear and parabolic dispersions yields correlated charge density modes exploitable for nanometric light confinement. Her...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-11-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-23058-3 |
| _version_ | 1811233746061361152 |
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| author | Michele Pisarra Cristian Vacacela Gomez Antonello Sindona |
| author_facet | Michele Pisarra Cristian Vacacela Gomez Antonello Sindona |
| author_sort | Michele Pisarra |
| collection | DOAJ |
| description | Abstract Atomically thin crystals may exhibit peculiar dispersive electronic states equivalent to free charged particles of ultralight to ultraheavy masses. A rare coexistence of linear and parabolic dispersions yields correlated charge density modes exploitable for nanometric light confinement. Here, we use a time-dependent density-functional approach, under several levels of increasing accuracy, from the random-phase approximation to the Bethe-Salpeter equation formalism, to assess the role of different synthesized germanene samples as platforms for these plasmon excitations. In particular, we establish that both freestanding and some supported germenene monolayers can sustain infrared massless modes, resolved into an out-of-phase (optical) and an in-phase (acoustic) component. We further indicate precise experimental geometries that naturally host infrared massive modes, involving two different families of parabolic charge carriers. We thus show that the interplay of the massless and massive plasmons can be finetuned by applied extrinsic conditions or geometry deformations, which constitutes the core mechanism of germanene-based optoelectronic and plasmonic applications. |
| first_indexed | 2024-04-12T11:24:21Z |
| format | Article |
| id | doaj.art-9ab31b3f52544218bba7f763ec0361d5 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-12T11:24:21Z |
| publishDate | 2022-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-9ab31b3f52544218bba7f763ec0361d52022-12-22T03:35:16ZengNature PortfolioScientific Reports2045-23222022-11-0112111510.1038/s41598-022-23058-3Massive and massless plasmons in germanene nanosheetsMichele Pisarra0Cristian Vacacela Gomez1Antonello Sindona2Gruppo Collegato di Cosenza, Sezione dei Laboratori Nazionali di Frascati (LNF), Istituto Nazionale di Fisica Nucleare (INFN)Facultad de Ciencias, Escuela Superior Politécnica de Chimborazo (ESPOCH)Gruppo Collegato di Cosenza, Sezione dei Laboratori Nazionali di Frascati (LNF), Istituto Nazionale di Fisica Nucleare (INFN)Abstract Atomically thin crystals may exhibit peculiar dispersive electronic states equivalent to free charged particles of ultralight to ultraheavy masses. A rare coexistence of linear and parabolic dispersions yields correlated charge density modes exploitable for nanometric light confinement. Here, we use a time-dependent density-functional approach, under several levels of increasing accuracy, from the random-phase approximation to the Bethe-Salpeter equation formalism, to assess the role of different synthesized germanene samples as platforms for these plasmon excitations. In particular, we establish that both freestanding and some supported germenene monolayers can sustain infrared massless modes, resolved into an out-of-phase (optical) and an in-phase (acoustic) component. We further indicate precise experimental geometries that naturally host infrared massive modes, involving two different families of parabolic charge carriers. We thus show that the interplay of the massless and massive plasmons can be finetuned by applied extrinsic conditions or geometry deformations, which constitutes the core mechanism of germanene-based optoelectronic and plasmonic applications.https://doi.org/10.1038/s41598-022-23058-3 |
| spellingShingle | Michele Pisarra Cristian Vacacela Gomez Antonello Sindona Massive and massless plasmons in germanene nanosheets Scientific Reports |
| title | Massive and massless plasmons in germanene nanosheets |
| title_full | Massive and massless plasmons in germanene nanosheets |
| title_fullStr | Massive and massless plasmons in germanene nanosheets |
| title_full_unstemmed | Massive and massless plasmons in germanene nanosheets |
| title_short | Massive and massless plasmons in germanene nanosheets |
| title_sort | massive and massless plasmons in germanene nanosheets |
| url | https://doi.org/10.1038/s41598-022-23058-3 |
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