Computational Materials Science, Journal Year: 2024, Volume and Issue: 244, P. 113228 - 113228
Published: July 12, 2024
Language: Английский
Nano Letters, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 20, 2024
We demonstrate both experimentally and analytically a strong coupling phenomenon between moiré-type plasmons phonons within moiré superlattices. study the dependence of wave vector twist angle numerically simulate fabricate metallic superlattices on suspended thin film SiO2 substrate at different angles. The results suggest that strength initially increases then decreases with increasing When is 16.26°, we achieve plasmon-phonon Rabi splitting approaching 45 meV. further analyze system by utilizing coupled-harmonic-oscillators theory quantum mechanical theory. calculations numerical simulations agree experimental results. proposed has potential to contribute substantially electromagnetic field controlling coupling.
Language: Английский
Citations
1
Nanomaterials, Journal Year: 2022, Volume and Issue: 12(24), P. 4436 - 4436
Published: Dec. 13, 2022
Van der Waals (vdW) heterostructures pave the way to achieve desired material properties for a variety of applications. In this way, new scientific and industrial challenges fundamental questions arise. One them is whether vdW materials preserve their original optical response when assembled in heterostructure. Here, we resolve issue four exemplary monolayer heterostructures: MoS2/Gr, MoS2/hBN, WS2/Gr, WS2/hBN. Through joint Raman, ellipsometry, reflectance spectroscopies, discovered that alter MoS2 WS2 constants. Furthermore, despite similarity monolayers, behavior markedly different. While has large changes, particularly above 3 eV, experiences modest changes We also detected transformation from dark into bright exciton MoS2/Gr summary, our findings provide clear evidence not sum its constituents.
Language: Английский
Citations
4
Journal of Semiconductors, Journal Year: 2023, Volume and Issue: 44(1), P. 011903 - 011903
Published: Jan. 1, 2023
Abstract Moiré materials, composed of two single-layer two-dimensional semiconductors, are important because they good platforms for studying strongly correlated physics. Among them, moiré materials based on transition metal dichalcogenides (TMDs) have been intensively studied. The hetero-bilayer can support interlayer excitons if there is a small twist angle or lattice constant difference between the TMDs in and form type-II band alignment. coupling to cavity modes induce exotic phenomena. Here, we review recent advances cavities, comment current difficulties possible future research directions this field.
Language: Английский
Citations
1
2D Materials, Journal Year: 2024, Volume and Issue: 11(3), P. 035027 - 035027
Published: May 24, 2024
Abstract Excitons in twisted bilayers of transition metal dichalcogenides have strongly modified dispersion relations due to the formation periodic moiré potentials. The strong coupling a light field an optical cavity leads appearance polaritons. In this paper, we derive theoretical model for linear absorption spectrum coupled polariton–phonon system based on time-convolutionless (TCL) approach. Results obtained by numerically solving TCL equation are compared those Markovian limit and from perturbative treatment non-Markovian corrections. A key quantity interpretation findings is generalized phonon spectral density. We discuss impact realistic exciton dispersions varying twist angle temperature. Key features introduced phonons broadenings energy shifts upper lower polariton peak sidebands between them. analyze these with respect role effects find that they depend angle. can distinguish regimes large, small, intermediate angles. latter particularly pronounced dominating transitions into regions which characterized van Hove singularities density states.
Language: Английский
Citations
0
Computational Materials Science, Journal Year: 2024, Volume and Issue: 244, P. 113228 - 113228
Published: July 12, 2024
Language: Английский
Citations
0