Professor Joungreal Ahn, of Physics department created a 4D Experimental Space for the first time.
- 자연과학대학
- Hit2458
- 2018-08-20
Professor Joungreal Ahn, of Physics department created a 4D Experimental Space for the first time.
This is the first time that Korean
researchers have developed a way to enable experimental research in a
four-dimensional space.
The Korea Research Foundation announced
on July 28 that Sungkyunkwan University physics department researchers
succeeded in realizing four-dimensional space by giving four independent
dimensional axes to graphene which is a two-dimensional substance. The results
of the study were published on Wednesday (August 28) in Science.
This is a translation of the khan news.
(Source: http://news.khan.co.kr/kh_news/khan_art_view.html?artid=201806290300015&code=610100)
(Original dissertation: http://science.sciencemag.org/content/early/2018/06/27/science.aar8412.full)
Abstract
Quantum states of quasiparticles in solids are dictated by symmetry. We
experimentally demonstrate Dirac electrons in a two-dimensional quasicrystal
without translational symmetry. A dodecagonal quasicrystalline order was
realized by epitaxial growth of twisted bilayer graphene rotated exactly 30°.
The graphene quasicrystal was grown up to a millimeter scale on an SiC (0001)
surface while maintaining the single rotation angle over an entire sample and
was successfully isolated from a substrate, demonstrating its structural and
chemical stability under ambient conditions. Multiple Dirac cones replicated
with the 12-fold rotational symmetry were observed in angle-resolved photoemission
spectra, which revealed anomalous strong interlayer coupling with
quasi-periodicity. Our study provides a way to explore physical properties of
relativistic fermions with controllable quasicrystalline orders.