Existence of 'Spin Cloud' Confirmed After 50 Years

[Asia Economy Reporter Junho Hwang] Domestic researchers have confirmed the existence of spin clouds. The presence of spin clouds, which mask the magnetism of impurities within metals and semiconductors, has been proven after 50 years, paving the way for the development of new quantum information devices. KAIST introduced this on the 12th regarding the research paper by Sim Jeongmin, a doctoral student in the Department of Physics.

The research team, in collaboration with researchers from Japan's RIKEN and Hong Kong City University, captured the existence of spin clouds measuring micrometers (10^-6 meters) in size. The team created quantum devices capable of generating impurity spins in semiconductors and applying electric fields around the impurities. They also measured the spin clouds by observing electrical signals at a low temperature of 100 mK (millikelvin). According to the team, the size and spatial distribution of the spin clouds matched theoretical predictions.

Professor Sim Heungseon stated, "Proving the existence of spin clouds has been a long-standing goal in academia. With the discovery of spin clouds in this study, we expect follow-up research on spin clouds to be activated. Not only can spin clouds be electrically controlled to help understand unresolved magnetic problems, but based on the quantum entanglement properties of spin clouds, next-generation quantum information devices can also be developed."

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