Stark effect in MoSe2 monolayer heterostructure

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Resumo

The effect of a vertical electric field on photoluminescence of a MoSe2 monolayer encapsulated with hexagonal boron nitride is investigated. In the spectra, there is a quadratic shift of the photoluminescence lines of excitons and trions from the applied potential difference, as well as a change in their intensity. It is found that the magnitude of the Stark shift significantly exceeds the theoretically predicted one. It is found that the energy distance between the trion and exciton lines in the spectra varies with the magnitude of the external field, which is due to the dependence of the density of free charge carriers in the monolayer on the field. This effect made it possible to determine the density of free charge carriers in the monolayer, which varies with the field and lies in the range from 0.3–3.4⋅1012 cm–2.

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Sobre autores

A. Chernenko

Osipyan Institute of Solid-State Physics of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: chernen@issp.ac.ru
Rússia, Chernogolovka

A. Brichkin

Osipyan Institute of Solid-State Physics of the Russian Academy of Sciences

Email: chernen@issp.ac.ru
Rússia, Chernogolovka

G. Golyshkov

Osipyan Institute of Solid-State Physics of the Russian Academy of Sciences

Email: chernen@issp.ac.ru
Rússia, Chernogolovka

Bibliografia

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2. Fig. 1. Schematic of the structure with contacts for application of vertical electric field (a). Photograph of the sample with contours of its constituent layers highlighted by colour lines (layer thicknesses: graphite 3 nm, bottom layer hBN100 nm, monolayer MoSe2 0.3 nm, top hBN10 nm, multilayer graphene 1 nm) before sputtering of contacts (b)

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3. Fig. 2. FL spectra at two different points of the sample with a single exciton (X) line (a), with two lines, exciton (X) and trion (T) (b) at different values of Vg, at T = 13 K and power density W = 15.6 kW/cm2

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4. Fig. 3. Series of FL spectra recorded in the temperature range 13-136 K, at constant laser excitation density W = 15.6 kW/cm2 at Vg = 0 V

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5. Fig. 4. Stark shifts of the exciton FL lines in the absence of the trion (a) and in the presence of the trion (b) at temperature T = 13 K and constant pumping. Solid lines indicate fitting curves corresponding to the expression ΔE = (-1/2) αF2 + E0, where E0 is a constant. Black and red colours indicate the results obtained for different directions of electric field variation

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6. Fig. 5. Dependence of the energy interval ET-X (V) between the trion T and exciton X lines on the potential difference on the capacitor liners Vg obtained at T = 13 K and constant laser pumping density

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