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Angular
resolved photoemission (ARPES) is a
uniquely
powerful tool for probing electronic quasiparticles. It is virtually
the only spectroscopy with direct momentum resolution, a key advantage
for the study of anisotropic and low-dimensional materials. ARPES data
contain the band structure of a material, and, because the signal is
proportional to the single particle spectral function, give detailed
information on the propagation of electrons in the full many-body
system.
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Scanning
probe microscopies (STM and AFM) are the
most exquisite tools to not only investigating the geometric, but also
the electronic structure of flat surfaces at the atomic scale. When
operated at low temperatures, one can uniquely benefit of electronic
spectroscopy (STS) and vibrational spectroscopy (IETS) at the single
atom/molecule level. Furthermore, atomic manipulations allow for a
tailored design of nano-structures. STM, AFM and their spectroscopy
modes have revolutionized our understanding of the physics and
chemistry at surfaces.
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