Theory of phonon sidebands in the absorption spectra of moiré exciton–polaritons DOI Creative Commons
K Jürgens, Daniel Wigger, T. Kühn

et al.

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

Magneto-Optics of Anisotropic Exciton Polaritons in Two-Dimensional Perovskites DOI Creative Commons

Jonas K. König,

Jamie M. Fitzgerald, Ermin Malić

et al.

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: May 13, 2025

Layered two-dimensional (2D) organic-inorganic perovskite semiconductors support strongly confined excitons that offer significant potential for ultrathin polaritonic devices due to their tunability and huge oscillator strength. The application of a magnetic field has proven be an invaluable tool investigating the exciton fine structure observed in these materials, yet combination in-plane strong coupling regime remained largely unexplored. In this work, we combine microscopic theory with rigorous solution Maxwell's equations model magneto-optics polaritons 2D perovskites. We predict brightened dark state can enter regime. Furthermore, magnetic-field-induced mixing polarization selection rules breaking symmetry lead highly anisotropic polariton branches. This study contributes better understanding perovskites demonstrates cavity control polarization-sensitive polaritons.

Language: Английский

Citations

0
Revealing Dark Exciton Signatures in Polariton Spectra of 2D Materials DOI
Beatriz Ferreira, Hangyong Shan, Roberto Rosati

et al.

ACS Photonics, Journal Year: 2024, Volume and Issue: 11(6), P. 2215 - 2220

Published: May 22, 2024

Dark excitons in transition metal dichalcogenides (TMDs) have been so far neglected the context of polariton physics due to their lack oscillator strength. However, tungsten-based TMDs, dark are known be energetically lowest states and could thus provide important scattering partners for polaritons. In this joint theoretical–experimental work, we investigate impact full exciton energy landscape on absorption reflectance. By changing cavity detuning, vary relative unaffected such a way that open or close specific phonon-driven channels. We demonstrate both theory experiment controlled switching channels manifests characteristic sharp changes optical spectra These spectral features can exploited extract position excitons. Our work suggests new possibilities exploiting polaritons fingerprinting nanomaterials via unique landscape.

Language: Английский

Citations

3
Two dimensional semiconductors: Optical and electronic properties DOI
Roberto Rosati, Ioannis Paradisanos, Ermin Malić

et al.

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Language: Английский

Citations

3
Moiré Exciton Polaron Engineering via twisted hBN DOI Creative Commons
Min Hyun Cho, Biswajit Datta,

Kehui Han

et al.

Nano Letters, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 2, 2024

Twisted hexagonal boron nitride (thBN) exhibits ferroelectricity due to moiré superlattices with AB/BA domains. These domains possess electric dipoles, leading a periodic electrostatic potential that can be imprinted onto other materials placed in its proximity. Here we demonstrate the remote imprinting of patterns from thBN monolayer MoSe2 and investigate changes exciton properties. We confirm on using Kelvin probe force microscopy (KPFM) hyperspectral photoluminescence (PL) mapping. By creating large ferroelectric domain (∼8.7 μm), achieve unprecedented modulation (∼387 ± 52 meV). observe formation exciton-polarons by optical property induced pattern varying size down ∼110 nm. Our findings highlight as platform for controlling properties 2D optoelectronic valleytronic applications.

Language: Английский

Citations

3
Interlayer exciton polaritons in homobilayers of transition metal dichalcogenides DOI

Jonas K König,

Jamie M. Fitzgerald, Joakim Hagel

et al.

2D Materials, Journal Year: 2023, Volume and Issue: 10(2), P. 025019 - 025019

Published: March 7, 2023

Abstract Transition metal dichalcogenides integrated within a high-quality microcavity support well-defined exciton polaritons. While the role of intralayer excitons in 2D polaritonics is well studied, interlayer have been largely ignored due to their weak oscillator strength. Using microscopic and material-realistic Wannier–Hopfield model, we demonstrate that MoS 2 homobilayers Fabry–Perot cavity polaritons exhibit large contribution, while remaining visible linear optical spectra. Interestingly, with suitable tuning length, hybridization between intra- can be ‘unmixed’ interaction photons. We predict formation where > 90 % total excitonic contribution stemming from exciton. Furthermore, explore conditions on tunneling strength energy landscape push this 100%. Despite extremely underlying exciton, effectively fed into once critical coupling condition balanced radiative scattering decay channels met. These findings wide relevance for fields ranging nonlinear optoelectronic devices Bose–Einstein condensation.

Language: Английский

Citations

6
Emergence of Optical Anisotropy in Moiré Superlattice via Heterointerface Engineering DOI
Xing Xie, Biao Wu,

Junnan Ding

et al.

Nano Letters, Journal Year: 2024, Volume and Issue: 24(30), P. 9186 - 9194

Published: July 16, 2024

The interaction between light and moiré superlattices presents a platform for exploring unique light-matter phenomena. Tailoring these optical properties holds immense potential advancing the utilization of in photonics, optoelectronics, valleytronics. However, control polarization state superlattices, particularly presence effects, remains elusive. Here, we unveil emergence anisotropy by constructing twisted WSe

Language: Английский

Citations

2
Cavity-Tuned Exciton Dynamics in Transition Metal Dichalcogenides Monolayers DOI Open Access
Kaijun Shen, Kewei Sun, Maxim F. Gelin

et al.

Materials, Journal Year: 2024, Volume and Issue: 17(16), P. 4127 - 4127

Published: Aug. 20, 2024

A fully quantum, numerically accurate methodology is presented for the simulation of exciton dynamics and time-resolved fluorescence cavity-tuned two-dimensional (2D) materials at finite temperatures. This approach was specifically applied to a monolayer WSe2 system. Our enabled us identify dynamical spectroscopic signatures polaronic polaritonic effects elucidate their characteristic timescales across range exciton–cavity couplings. The employed can be extended various 2D materials, exploring temperature nonlinear signals.

Language: Английский

Citations

2
Signatures of dark excitons in exciton–polariton optics of transition metal dichalcogenides DOI Creative Commons
Beatriz Ferreira, Roberto Rosati, Jamie M. Fitzgerald

et al.

2D Materials, Journal Year: 2022, Volume and Issue: 10(1), P. 015012 - 015012

Published: Nov. 11, 2022

Abstract Integrating 2D materials into high-quality optical microcavities opens the door to fascinating many-particle phenomena including formation of exciton–polaritons. These are hybrid quasi-particles inheriting properties both constituent photons and excitons. In this work, we investigate so-far overlooked impact dark excitons on momentum-resolved absorption spectra hBN-encapsulated WSe 2 MoSe monolayers in strong-coupling regime. particular, thanks efficient phonon-mediated scattering polaritons energetically lower exciton states, polariton branch is much higher than . It shows unique step-like increases profile indicating opening specific channels. We study how different externally accessible quantities, such as temperature or mirror reflectance, change response polaritons. Our contributes an improved microscopic understanding exciton–polaritons their interaction with phonons, potentially suggesting experiments that could determine energy states via absorption.

Language: Английский

Citations

7
Progress and prospects of Moiré superlattices in twisted TMD heterostructures DOI

Syed Jamal Shah,

Junying Chen, Xing Xie

et al.

Nano Research, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 6, 2024

Language: Английский

Citations

1
Strong Coupling between Moiré-Type Plasmons and Phonons in Suspended Monolayer Metallic Twisted Superlattices DOI
Bin You, Yuhan Du,

Shuangxiu Yuan

et al.

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