Detection of quantum phase transition characteristics of two-dimensional materials
- 2018-05-28
Professor Young Hee Lee (Energy Science dept., SKKU) recently measured the metal-insulator transition (MIT) phenomenon in molybdenum disulfide (MoS2), a layered structure, as a transistor, and explained it as a phenomenon of quantum phase transition and that the phase transition characteristics change depending on the thickness.
It has long been believed that quantum phase transition from an insulator to a conductor is theoretically impossible in systems with less than two dimensions. However, a lot of research has been conducted since the discovery of the conductor-nonconductor phase transition experimentally in a two-dimensional system in silicones in 1994. It is generally accepted that the interaction between electrons is a factor of the conductor- . However, the conductor-nonconductor phase transition in two-dimensional systems has remained one of the most difficult problems to solve in physics.
△ prof. Young Hee Lee (Director of IBS)
It is generally agreed that the conductor-nonconductor phase transition in a two-dimensional system is due to the interaction of electrons when the conductor-nonconductor phase transition is regarded as a quantum phase transition. However, a clear understanding of the correlation between impurities and interactions in the two-dimensional marginal dimension was subtle and not easily understood. Especially, when the two effects are similar in importance, the theoretical approach is difficult, and the experiment is close to the problem that can not be solved due to the limitation of the available system.
One of the members of the panel who was responsible for the review of this study said, "The result of the two-dimensional conductor-inductance phase transition in this new material is a new interest and a fascinating problem of Anderson localization in a multi- It is interesting enough to attract attention again. "
The results of the study were published online at 10:00 am on May 24 in the UK online edition of Nature communications (IF 12.124), the world's leading journal.
[Source: Joongang Ilbo] Professor Lee, Young Hee of Sungkyunkwan University discovered the change of quantum phase transition characteristics of 2D materials
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