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Semiconductor-to-metal transition in the bulk of WSe 2 upon potassium intercalation.
We present electron energy-loss spectroscopic measurements of potassium (K) intercalated tungsten diselenide (WSe2 ). After exposure of pristine WSe2 films to potassium, we observe a charge carrier plasmon excitation at about 0.97 eV, which indicates a semiconductor-to-metal transition. Our data reveal the formation of one particular doped K-WSe2 phase. A Kramers-Kronig analysis allows the determination of the dielectric function and the estimation of the composition of K0.6 WSe2 . Momentum dependent measurements reveal a substantial plasmon dispersion to higher energies.
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