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(Color online) Temperature-dependent photoemission spectra of Pb films for (a) 23 ML and (b) 24 ML collected within a temperature range of . The vertical dashed lines are guides to the eye, for the variation of the QWS binding energy.
(Color online) Binding energy of the QWS for various Pb films plotted as a function of temperature. The dots and lines indicate the experimental data and linear fits, respectively.
(Color online) Thermal expansion coefficients of Pb films along the confined direction calculated with the proposed model.
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