Direct detection of spin waves in gaseous 3He↑

Tastevin, Geneviève; Nacher, Pierre-Jean; Leduc, Michèle; Laloë, Franck

doi:10.1051/jphyslet:01985004606024900

Cited by 30 publications

(4 citation statements)

References 13 publications

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“…Similar predictions had been made independently by Bashkin [5] from a more macroscopic point of view, based on the notion of "molecular field" (or mean field) -see also the work of Lévy and Ruckenstein [6]. Transverse spin waves in gases were subsequently observed in H↓ [7] as well as in helium [8,9].…”

supporting

confidence: 72%

Internal State Conversion in Ultracold Gases

2002

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We consider an ultracold gas of (noncondensed) bosons or fermions with two internal states, and we study the effect of a gradient of the transition frequency between these states. When a pi/2 rf pulse is applied to the sample, exchange effects during collisions transfer the atoms into internal states which depend on the direction of their velocity. This results, after a short time, in a spatial separation between the two states. A kinetic equation is solved analytically and numerically; the results agree well with the recent observations of Lewandowski et al.

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confidence: 72%

Internal State Conversion in Ultracold Gases

2002

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“…Accuracy of the asymptotic approximations for 3 He. The figure shows the 'exact' calculation, the asymptotic formulaequation (10), and the first-order formulaequation (11) μ in 3 He. The inset shows the relative error from the 'exact' value.…”

Section: Discussionmentioning

confidence: 99%

“…The temperature and density behavior of one of the peaks has also suggested that one may treat these spin waves as quasiparticles (magnons) which undergo Bose-Einstein Condensation [6]. Spin transport effects related with ISRE have also been observed in liquid 3 He- 4 He mixtures [12], 3 He gas [10,11], and in the cold gas of 87 Rb [8,9,13].…”

Section: Introductionmentioning

confidence: 99%

Spin waves in quantum gases—the quality factor of the identical spin rotation effect

Lehtonen¹,

Vainio²,

Ahokas³

et al. 2018

Phys. Scr.

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Our recent experimental work on electron spin waves in atomic hydrogen gas has prompted a revisit of the theory of the Identical Spin Rotation Effect (ISRE). A key characteristic determining the properties of the spin waves is the quality factor of ISRE. Unfortunately, calculating this quality factor takes some toil. In this paper we summarize some results of the ISRE theory in dilute gases. We also derive asymptotic formulae for the quality factor and examine their accuracy for hydrogen and 3 He. arXiv:1804.10431v1 [cond-mat.quant-gas]

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“…Such high polarizations could not be achieved by MEOP directly performed at low temperature due to the highly reduced rate of ME collisions (see Sec. III.B.2), but room temperature OP with polarized gas transfer enabled a series of low-temperature studies of 3 He as a quantum fluid: characterization of spin waves (Nacher et al , 1984; Tastevin et al , 1985) and heat conduction changes (Larat et al , 1990; Leduc et al , 1987) in 3 He gas and of phase coexistence for liquid 3 He (Candela et al , 1994; Tastevin, 1992b; Villard et al , 2000). A similar technique was used with refillable cells to repeatedly prepare larger samples of polarized liquid in which magnetic interactions play a key role in non-linear NMR dynamics (Baudin et al , 2008; Hayden et al , 2007).…”

Section: He Relaxationmentioning

confidence: 99%

Optically polarizedHe3

et al. 2017

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This article reviews the physics and technology of producing large quantities of highly spin-polarized 3He nuclei using spin-exchange (SEOP) and metastability-exchange (MEOP) optical pumping. Both technical developments and deeper understanding of the physical processes involved have led to substantial improvements in the capabilities of both methods. For SEOP, the use of spectrally narrowed lasers and K-Rb mixtures has substantially increased the achievable polarization and polarizing rate. For MEOP nearly lossless compression allows for rapid production of polarized 3He and operation in high magnetic fields has likewise significantly increased the pressure at which this method can be performed, and revealed new phenomena. Both methods have benefitted from development of storage methods that allow for spin-relaxation times of hundreds of hours, and specialized precision methods for polarimetry. SEOP and MEOP are now widely applied for spin-polarized targets, neutron spin filters, magnetic resonance imaging, and precision measurements.

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Direct detection of spin waves in gaseous 3He↑

Abstract: Résumé. 2014 Lett. 46 (1985) L-249 -L-254 15 MARS 1985,

Cited by 30 publications

References 13 publications

Internal State Conversion in Ultracold Gases

Internal State Conversion in Ultracold Gases

Spin waves in quantum gases—the quality factor of the identical spin rotation effect

Optically polarizedHe3

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