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Transfer of electrons through semiconductor heterojunctions is the key process in all electronics. Here we make movies of electron dynamics in InSe/GaAs through time and spectrally-resolved photoemission electron microscopy, bringing insights to this fundamental process.
We demonstrate a new parallel plate waveguide (PPWG) based terahertz spectroscopy approach to characterize the electromagnetic properties of low conductive two-dimensional materials. We find that the TE mode is suitable for such prototype of materials.
Thickness dependence of second harmonic generation in atomically thin InSe is studied. A strong resonance is observed, attributed to interference between distinct surface and bulk nonlinear contributions.
In this work, we demonstrate the use of laser THz emission microscopy (LTEM) in evaluating the binding energy of locally adsorbed O2 molecules on 2D materials. The THz waveform can be correlated with the local O2 adsorbate concentration as a function of temperature, allowing the use of LTEM for temperature programmed desorption measurements.
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