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- W3170752138 abstract "A laser beam is focused onto the junction of a scanning tunneling microscope (STM) to probe the local photocurrent response of highly ordered $mathrm{Mo}{mathrm{Se}}_{2}$ islands. The islands, grown by physical vapor deposition onto Au(111), are characterized by uniform triangular shapes, Mo-terminated edges, and the typical 1.8 V band gap of monolayer $mathrm{Mo}{mathrm{Se}}_{2}$. The laser-induced signals are detected with nanometer spatial resolution by a lock-in amplifier, both in the form of point spectra and surface maps. To distinguish real photocurrents from current contributions, arising from periodic tip expansions due to the dissipated laser power, blind experiments are performed in which the tip height is modulated without laser irradiation. In addition, the expected current responses are simulated as a function of sample bias for the two scenarios. Comparison between experimental and simulated data indicates that periodic tip expansions dominate the detected current modulations and photoinduced signals are of minor importance. Our work provides various indicators to safely distinguish photo- and thermally induced current components in a laser-driven STM experiment and discusses means to enhance the desired photoresponse with respect to parasitic thermal effects." @default.
- W3170752138 created "2021-06-22" @default.
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- W3170752138 date "2021-06-15" @default.
- W3170752138 modified "2023-09-23" @default.
- W3170752138 title "Laser stimulation of MoSe2/Au(111) in an STM junction: Photoinduced versus thermally induced current response" @default.
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- W3170752138 doi "https://doi.org/10.1103/physrevb.103.245420" @default.
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