Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates

Abstract We study the pseudo-spin density response of a disordered two-dimensional spin-polarized Bose gas to weak alternating magnetic field, assuming that one of the spin states of the doublet is macroscopically occupied and Bose-condensed while the occupation of the other state remains much small...

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Autores principales:	V. M. Kovalev, I. G. Savenko
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1be0526bf5464831b96d360f57a7150c
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spelling	oai:doaj.org-article:1be0526bf5464831b96d360f57a7150c2021-12-02T11:41:09ZParamagnetic resonance in spin-polarized disordered Bose-Einstein condensates10.1038/s41598-017-01125-42045-2322https://doaj.org/article/1be0526bf5464831b96d360f57a7150c2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01125-4https://doaj.org/toc/2045-2322Abstract We study the pseudo-spin density response of a disordered two-dimensional spin-polarized Bose gas to weak alternating magnetic field, assuming that one of the spin states of the doublet is macroscopically occupied and Bose-condensed while the occupation of the other state remains much smaller. We calculate spatial and temporal dispersions of spin susceptibility of the gas taking into account spin-flip processes due to the transverse-longitudinal splitting, considering microcavity exciton polaritons as a testbed. Further, we use the Bogoliubov theory of weakly-interacting gases and show that the time-dependent magnetic field power absorption exhibits double resonance structure corresponding to two particle spin states (contrast to paramagnetic resonance in regular spin-polarized electron gas). We analyze the widths of these resonances caused by scattering on the disorder and show that, in contrast with the ballistic regime, in the presence of impurities, the polariton scattering on them is twofold: scattering on the impurity potential directly and scattering on the spatially fluctuating condensate density caused by the disorder. As a result, the width of the resonance associated with the Bose-condensed spin state can be surprisingly narrow in comparison with the width of the resonance associated with the non-condensed state.V. M. KovalevI. G. SavenkoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q V. M. Kovalev I. G. Savenko Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates
description	Abstract We study the pseudo-spin density response of a disordered two-dimensional spin-polarized Bose gas to weak alternating magnetic field, assuming that one of the spin states of the doublet is macroscopically occupied and Bose-condensed while the occupation of the other state remains much smaller. We calculate spatial and temporal dispersions of spin susceptibility of the gas taking into account spin-flip processes due to the transverse-longitudinal splitting, considering microcavity exciton polaritons as a testbed. Further, we use the Bogoliubov theory of weakly-interacting gases and show that the time-dependent magnetic field power absorption exhibits double resonance structure corresponding to two particle spin states (contrast to paramagnetic resonance in regular spin-polarized electron gas). We analyze the widths of these resonances caused by scattering on the disorder and show that, in contrast with the ballistic regime, in the presence of impurities, the polariton scattering on them is twofold: scattering on the impurity potential directly and scattering on the spatially fluctuating condensate density caused by the disorder. As a result, the width of the resonance associated with the Bose-condensed spin state can be surprisingly narrow in comparison with the width of the resonance associated with the non-condensed state.
format	article
author	V. M. Kovalev I. G. Savenko
author_facet	V. M. Kovalev I. G. Savenko
author_sort	V. M. Kovalev
title	Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates
title_short	Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates
title_full	Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates
title_fullStr	Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates
title_full_unstemmed	Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates
title_sort	paramagnetic resonance in spin-polarized disordered bose-einstein condensates
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1be0526bf5464831b96d360f57a7150c
work_keys_str_mv	AT vmkovalev paramagneticresonanceinspinpolarizeddisorderedboseeinsteincondensates AT igsavenko paramagneticresonanceinspinpolarizeddisorderedboseeinsteincondensates
_version_	1718395447782932480

Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates

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