Seminarium om kondenserade materiens fysik - Søren Ulstrup

Søren Ulstrup: Measuring Many-Body Effects in Operating Devices with nanoARPES

Abstract

The charge carrier-dependent spectral function underpins the electronic and optical properties of materials. Here, I will demonstrate the powerful concept of unifying spectroscopic and transport measurements of the energy- and momentum-dependent spectral function using angle-resolved photoemission spectroscopy with nanoscale spatial resolution (nanoARPES). I will show that this technique allows for a noninvasive local measurement of composition, structure, many-body effects and carrier mobility of devices composed of two-dimensional heterostructures in the presence of high current densities and tunable charge carrier concentrations ^[1,2,3]. Future opportunities for the experiments will be discussed. 

[1] R. Muzzio et al. Phys. Rev. B 101, 201409(R) (2020) 

[2] D. Curcio et al. Phys. Rev. Lett 125, 236403 (2020)

[3] Nguyen et al. Nature 572, 220 (2019)

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Seminarium om kondenserade materiens fysik