Exciton-polariton in WS2 microcavity in the presence of the optical Stark effect

Mahnoor Shahzadi; Weili Zhang; M. T. Khan

doi:10.3788/COL201917.020014

Journals >Chinese Optics Letters >Volume 17 >Issue 2 >Page 020014 > Article

Chinese Optics Letters
Vol. 17, Issue 2, 020014 (2019)

Exciton-polariton in WS₂ microcavity in the presence of the optical Stark effect

Mahnoor Shahzadi¹, Weili Zhang^1,*, and M. T. Khan²

Author Affiliations

¹School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China

²Electrical Engineering Department, University of Lahore, Islamabad Campus 54000, Pakistan

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DOI: 10.3788/COL201917.020014 Cite this Article Set citation alerts

Mahnoor Shahzadi, Weili Zhang, M. T. Khan, "Exciton-polariton in WS₂ microcavity in the presence of the optical Stark effect," Chin. Opt. Lett. 17, 020014 (2019) Copy Citation Text

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$Exciton energy and dispersion of polaritons for different values of an OS pulse. a, Energy shift of excitons as a function of E2Δ. b, Dispersion of polaritons. c, Shift of the polariton dispersion. d, Changes of the excitonic and photonic fraction. In b–d, Δ=0.2 meV, and E0 is 75, 100, 125, 150 MV, respectively (from down to up or from inside to outside).$

Fig. 1. Exciton energy and dispersion of polaritons for different values of an OS pulse. a, Energy shift of excitons as a function of E2Δ. b, Dispersion of polaritons. c, Shift of the polariton dispersion. d, Changes of the excitonic and photonic fraction. In b–d, Δ=0.2 meV, and E0 is 75, 100, 125, 150 MV, respectively (from down to up or from inside to outside).

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Fig. 2. Difference between UP and LP branches at various values of k, i.e., at k=0,1,2 (a, b, and c, respectively).

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Fig. 3. Dynamic analysis of the Stark effect on the energy shift of the polaritonic field. a, Waveform in the time domain. b, Fast Fourier transform of the waveform. In the calculation, k=0, t0=500, and a=0.5 ps.

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Fig. 4. Polarization degree versus E2Δ (simulation Ein=0.5 is considered).

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Symbol	Parameter	Value
$g_{1, 2}$	Nonlinear parameter	0
$γ_{c}$	Decay rate of the photon	0
$γ_{x}$	Decay rate of the exciton	0
$ω_{c}^{0}$	Cavity mode energy	2 eV
$Ω_{R}$	Rabi frequency	70 meV
$Δ$	Energy detuning	0.2 meV
$m_{c}$	Mass of photon	$10^{- 5} m_{x}$
$m_{x}$	Mass of exciton	$5.11 \times 10^{5} eV \cdot c^{2} \cdot S^{2} / m^{2}$
$E_{g}$	Quasi-particle bandgap	2.3 eV

Table 1. Specific Symbols and Values

Mahnoor Shahzadi, Weili Zhang, M. T. Khan, "Exciton-polariton in WS₂ microcavity in the presence of the optical Stark effect," Chin. Opt. Lett. 17, 020014 (2019)

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