Observation of tunable charged exciton polaritons in hybrid monolayer WS 2 plasmonic nanoantenna system
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1 Supporting Information for Observation of tunable charged exciton polaritons in hybrid monolayer WS 2 plasmonic nanoantenna system Jorge Cuadra 1,*, Denis G. Baranov 1, Martin Wersäll 1, Ruggero Verre 1, Tomasz J. Antosiewicz 1,2 and Timur Shegai 1,* 1 Department of Physics, Chalmers University of Technology, , Göteborg, Sweden. 2 Centre of New Technologies, University of Warsaw, Banacha 2c, Warsaw, Poland. * jorge.cuadra@chalmers.se; timurs@chamers.se Content: - 1. Bare nanoprism spectra vs temperature - 2. Dark field scattering anti-crossing data - 3. Reflectivity and photoluminescence of monolayer WS 2 vs temperature and vs adhesion layer - 4. Coupled system without adhesion layer - 5. Semiconductor PL vs temperature fit by O Donnel model - 6. Visualisation of Rabi oscillations - 7. Supplementary References
2 1. Bare nanoprism data: Figure S1 displays the DF spectra as a function of temperature for an individual bare Ag nanoprism. The decrease of the temperature from 300 K-77 K causes a red-shift of the plasmonic resonance and narrowing of the plasmon linewidth 1. Figure S1. Temperature dependency of the uncoupled Ag nanoprism. (a) DF spectra as a function of temperature for a silver prism on Si/SiO 2 substrate. The plasmonic resonance shifts its position towards low energies as the temperature is decreased. Inset corresponds to the SEM image showing the nanoprism; scale bar 100 nm. (b) Temperature dependence of the for several different Ag nanoprisms. (c) Temperature dependence between 300 and 6 K for selected temperatures (6 K, 77 K, 200 K and 300 K) for several additional nanoprisms. For all nanoprisms nearly 30% narrowing is observed upon cooling.
3 2. DF anti-crossing data: Figure S2. DF scattering data for several nanoparticles of different plasmon-exciton detuning. (a) Left: color coded DF scattering data at T = 300 K as a function of particle number. Particles are organized according to plasmon-exciton detuning. Right: DF scattering spectra for the same particles. Spectra are displaced vertically for clarity. (b) Left: color coded DF scattering data at T = 6 K as a function of particle number. Particles are organized according to plasmon-exciton detuning. Right: DF scattering spectra for the same particles. Spectra are displaced vertically for clarity. In both cases a clear anti-crossing is observed.
4 3. Reflectivity and photoluminescence of monolayer WS 2 vs temperature and vs polymer adhesion layer: Figure S3. Reflectivity measurements. (a) PL spectra for T = K when the polymer adhesion layer was used. At low temperature both exciton and trion resonances are well resolved. As the temperature is raised the trion is less visible. (b) Same as in (a) but without the polymer adhesion layer. The trion resonance is not observed for any temperature, whereas the exciton is observed for all temperatures as in a). (c) Reflectivity spectra for T = K when the polymer adhesion layer is used. A- and B-excitons are seen for all temperatures. For the A-exciton at low temperature both exciton and trion resonances are resolved, as the temperature is raised the trion is less visible. (d) Same as in (c) but without the polymer adhesion layer. The trion resonance is not observed in reflectivity measurements for any temperature, whereas the exciton is observed for all temperatures as in c).
5 Role of the polymer adhesion layer: The polymer adhesion layer not only ensures a proper density of nanoprisms but also changes the excitonic specimens (Fig. S3). For samples with adhesion layer the PL at low temperature is dominated by the trion whereas in samples without adhesion layer the exciton prevails in the PL spectra. This is caused by a chemical doping of p-type carriers (positively charged poly-lysine molecules) and stabilization of a positively charged trion state in the system 2.
6 4. Coupled system without polymer adhesion layer Figure S4: Samples without polymer adhesion layer. (a) Dark field spectra as a function of the temperature shows the interaction with the neutral exciton state
7 5. Semiconductor model: Both trion and exciton resonances blue-shift upon cooling, which is in agreement with the standard semiconductor behaviour and is confirmed here on the bare monolayer WS 2 (see Fig. S3 and S5). Indeed, temperature dependence of the semiconductor bandgap is conveniently described by the O Donell model for the temperature dependency of the semiconductor energy gap 3, Eq. (2) where 0 is the bandgap at 0 K, is the electron-phonon coupling strength, and is the average phonon energy. This model fits our data very well (see Fig. S5). The obtained values are consistent with earlier studies 4. Furthermore, we observe that the dissociation energy,, is nearly constant in the studied temperature range and is about 40 mev (see Fig. S3 and S5). The O Donnel model gives the following values of 0 =2.07 ev (2.02 ev), =1.78 (2.0) and =25 mev (33 mev) for X (T) correspondingly. The different values of for X and T might come from the fact that our temperature range covers only the decaying part of T (for T below 77 K the peak position reaches a quasi-steady state and both resonances barely move). The extracted parameters agree with previously reported values 5. It is worth noticing that the, although different for exciton and trion, is similar to the energy of the longitudinal acoustic phonon 6. The value is rather homogeneous among TMD monolayer and increases as the number of layers is decreased 7 this implies a strong electron-phonon coupling caused by confinement owned by the monolayer. Figure S5: Uncoupled exciton and trion vs temperature. Uncoupled exciton and trion resonances extracted from the PL data in Fig. S3a. O Donnel fits are shown by solid lines. The O Donnel model gives the following values of 0 =2.07 ev (2.02 ev), =1.78 (2.0) and =25 mev (33 mev) for X (T) correspondingly.
8 6. Rabi Oscillations: Figure S6: Visualisation of Rabi oscillations using FDTD. Field amplitudes as a function of time. Note ultrafast energy transfer between metal and WS 2 corresponding to several Rabi cycles. To monitor the temporal evolution of the excited we track the amplitude of the electric field of the plasmon of the Ag nanoprism and the auxiliary electric field in the WS 2, which is a measure of the amount of energy stored in the 2D material in the form of excitons.
9 7. Supplementary References: 1. Liu, M.; Pelton, M.; Guyot-Sionnest, P. Phys. Rev. B 2009, 79, (3), Mouri, S.; Miyauchi, Y.; Matsuda, K. Nano Lett. 2013, 13, (12), O Donnell, K. P.; Chen, X. Appl. Phys. Lett. 1991, 58, (25), Ross, J. S.; Wu, S.; Yu, H.; Ghimire, N. J.; Jones, A. M.; Aivazian, G.; Yan, J.; Mandrus, D. G.; Xiao, D.; Yao, W.; Xu, X. Nat. Commun. 2013, 4, Hanbicki, A. T.; Currie, M.; Kioseoglou, G.; Friedman, A. L.; Jonker, B. T. Solid State Commun. 2015, 203, Jin, Z.; Li, X.; Mullen, J. T.; Kim, K. W. Phys. Rev. B 2014, 90, (4), Arora, A.; Koperski, M.; Nogajewski, K.; Marcus, J.; Faugeras, C.; Potemski, M. Nanoscale 2015, 7, (23),
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