Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.143
Publication date: 23rd September 2021
In this talk I would like to present a perspective on the application of micro- Angle-Resolved PhotoEmission Spectroscopy (µ-ARPES) to study two-dimensional (2D) materials heterostructures. [1]
ARPES allows the direct measurement of the electronic band structure of solid-state materials, generating extremely useful insights into their electronic properties. The possibility to apply it to 2D materials is of paramount importance because these ultrathin layers are considered fundamental for future electronic, photonic and spintronic devices.
Moreover, recent technical developments of ARPES allow to visualize the entire band structure (including empty states) [2] and to obtain spin, real-space, many-body effects and electron-dynamics information. Direct measurements of k-space position, binding energy, effective mass, spin and dynamics of electrons at Valence Band Maximum and Conduction Band Minimum, are making ARPES an unmissable tool of investigation for 2D materials.
In this context, µ-ARPES has been developed for micro-area analysis, allowing the measurements of small samples and detecting variation of their properties in the micro-scale. It is routinely applied for exfoliated 2D materials and can complete other µ-investigations such as µ-Raman, µ-photoluminescence and scanning probe microscopies. µ-ARPES is very useful to understand electronic, spintronic and optoelectronic measurements for 2D heterostructures.
Because lateral dimensions and quality of sample are crucial for µ-ARPES, I would also briefly explain the preparation methods of 2D materials and heterostructures, presenting pros and cons of “bottom-up” [3] and “top-down” methods.
Some of the most interesting results obtained by ARPES for 2D heterostructures will be reported.
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