We discuss spin excitations in a degenerate 2D electron gas in a perpendicular quantizing magnetic field: spin-wave and 'Goldstone' excitons in quantum Hall ferromagnetic (filling factor ν =1) and spin-cyclotron excitons in quantum Hall insulator (ν =2). The latter excited states exhibit record-setting long lifetimes, up to 1 ms, owing to which a transition to a basically new collective state, magnetofermionic condensate, is observable at temperatures T

Keywords: magnetoexcitons, quantum Hall isolator, quantum Hall ferromagnetic, collective excitations, magnetofermionic condensate PACS: 71.35.Lk, 73.21.Fg, 78.67.De (all) DOI: 10.3367/UFNe.2018.10.038463 URL: https://ufn.ru/en/articles/2019/9/b/ 000504893200002 2-s2.0-85080883626 2019PhyU...62..865K Citation: Kulik L V, Gorbunov A V, Dickmann S M, Timofeev V B "Spin excitations in two-dimensional electron gas, their relaxation, photoexcitation and detection methods, and the role of Coulomb correlations" Phys. Usp. 62 865–891 (2019) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Received: 15th, June 2018, revised: 11th, October 2018, accepted: 31st, October 2018 Оригинал: Кулик Л В, Горбунов А В, Дикман С М, Тимофеев В Б «Спиновые возбуждения в двумерном электронном газе, их релаксация, методы фотовозбуждения и детектирования, роль кулоновских корреляций» УФН 189 925–954 (2019); DOI: 10.3367/UFNr.2018.10.038463