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ESG
ELECTRONIC STRUCTURES GROUP
DEPARTMENT OF PHYSICS AND ASTRONOMY
SEOUL NATIONAL UNIVERSITY


Art in ARPES
From MoS2 MDC maps


From SrTiO3 band structure


From Pt MDC maps


From SRO MDC maps
The Scream of Electrons (3rd Best Image Award in The Art in Science Exhibit 2016, 5th Anniversary of IBS)

By Shoresh Soltani (PhD Candidate)
Center for Correlated Electron Systems

Portraits of electron pockets living in a peculiar quantum world on the surface of strontium titanate. These ghostly beings which resemble The Scream by Edvard Munch, reveal themselves when we shed synchrotron light on a flat, shiny and clean surface of a single crystal in very low temperature and ultrahigh vacuum. They are responsible for electrical conductance on the surface of an insulating strontium titanate crystal which is the basis of oxide electronics. Different colors in each image, speak for different electron densities.
Star in Platinum

By Jongkeun Jung (PhD Candidate)
Center for Correlated Electron Systems

Platinum is not only a precious metal but also a useful material as a catalyst in chemical reactions. For example, it is used in automobiles as a catalytic converter. Its catalytic activity is determined by the surface properties such as the surface electronic structure. Experimental determination of its surface electronic structure is thus an important part of the catalysis research. The electronic structure can be measured using angle resolved photoemission (ARPES) technique in which photoelectric effect is utilized. The experimental data was taken by using synchrotron based ARPES. The Fermi surface data is star-shaped due to the underlying structural symmetry in the crystal structure. Images in the figure show constant energy contour data at different binding energies.
By Wonshik Kyung (PostDoc)
Material World through Kaleidoscope

By Beom Seo Kim (PhD Candidate)
Center for Correlated Electron Systems

Molybdenum di-telluride (MoTe2) has drawn growing attention due to its application possibility. It has six-fold symmetry in the electronic structure due to its crystal structure. The electronic structure of MoTe2 was measured by angle resolved photoemission and images were constructed by folding constant energy contour of the experimental data. Each image represents constant energy contour at a specific binding energy. While the image drastically changes over different binding energies, the six-fold symmetry remains intact. The six-fold symmetry is reminiscent of the colors of a peacock or a view through a kaleidoscope.