2000/09/29 by J. Eom, Jonghwa Eom, H. Cho +5 · 74 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Condensed matter physics #Degenerate energy levels #Electron #Ferromagnetism #Hysteresis #Magnetic field #Magnetic properties of thin films #Magnetoresistance #Physics #Quantum Hall effect #Quantum and electron transport phenomena #Quantum mechanics #Relaxation (psychology) #Spin (aerodynamics) #cond-mat.dis-nn #cond-mat.mes-hall
paper · pdf · doi:10.1126/science.289.5488.2320
published in Science 289(5488), 2320-2323 (American Association for the Advancement of Science) · 15 pages, 5 figures
openalex publication_date 2000/09/29 · arxiv created 2000/11/06 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Experiments on a nearly spin degenerate two-dimensional electron system reveals unusual hysteretic and relaxational transport in the fractional quantum Hall effect regime. The transition between the spin-polarized (with fill fraction nu = 1/3) and spin-unpolarized (nu = 2/5) states is accompanied by a complicated series of hysteresis loops reminiscent of a classical ferromagnet. In correlation with the hysteresis, magnetoresistance can either grow or decay logarithmically in time with remarkable persistence and does not saturate. In contrast to the established models of relaxation, the relaxation rate exhibits an anomalous divergence as temperature is reduced. These results indicate the presence of novel two-dimensional ferromagnetism with a complicated magnetic domain dynamic.