Excitations and Bose-Einstein condensation in liquid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>

Sakhel, Asaad R.; Glyde, H. R.

doi:10.1103/physrevb.70.144511

Cited by 12 publications

(12 citation statements)

References 27 publications

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“…At wave vectors beyond the roton, eq. (6) for χ(Q, ω) describes the temperature dependence of S(Q, E) well [47]. The sharp mode is represented by the G(Q, ω)t e r mw i t hw e i g h ti nS(Q, ω) proportional to the condensate fraction, n 0 (T ), which tracks the observed w e i g h ti nt h eP -Rm o d ew e l l .T h es h a r pP -Rm o d ei sn o longer observed [48] above T BEC where n 0 =0.…”

Section: -P4mentioning

confidence: 99%

Phonon-roton modes in liquid ⁴ He coincide with Bose-Einstein condensation

Bossy¹,

Ollivier²,

Schober³

et al. 2012

EPL

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Visit the EPL website to read the latest articles published in cutting-edge fields of research from across the whole of physics. Each compilation is led by its own Co-Editor, who is a leading scientist in that field, and who is responsible for overseeing the review process, selecting referees and making publication decisions for every manuscript. Image: Ornamental multiplication of space-time figures of temperature transformation rules (adapted from T. S. Bíró and P. Ván 2010 EPL 89 30001; artistic impression by Frédérique Swist).

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Section: -P4mentioning

confidence: 99%

Phonon-roton modes in liquid ⁴ He coincide with Bose-Einstein condensation

Bossy¹,

Ollivier²,

Schober³

et al. 2012

EPL

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“…These discrepancies have been reviewed in Refs. [59][60][61][62][63] The experiments 61,62 provided no indication of a welldefined mode (SP excitations) suddenly appearing in S(q, ω) for T < T c due to the first term in Eq. (10).…”

Section: Introductionmentioning

confidence: 99%

Collective and single-particle excitations in two-dimensional dipolar Bose gases

Filinov

Bönitz

2012

Phys. Rev. A

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The Berezinskii-Kosterlitz-Thouless transition in 2D dipolar systems has been studied recently by path integral Monte Carlo (PIMC) simulations [A. Filinov et al., PRL 105, 070401 (2010)]. Here, we complement this analysis and study temperature-coupling strength dependence of the density (particle-hole) and single-particle (SP) excitation spectra both in superfluid and normal phases. The dynamic structure factor, S(q, ω), of the longitudinal excitations is rigorously reconstructed with full information on damping. The SP spectral function, A(q, ω), is worked out from the one-particle Matsubara Green's function. A stochastic optimization method is applied for reconstruction from imaginary times. In the superfluid regime sharp energy resonances are observed both in the density and SP excitations. The involved hybridization of both spectra is discussed. In contrast, in the normal phase, when there is no coupling, the density modes, beyond acoustic phonons, are significantly damped. Our results generalize previous zero temperature analyses based on variational many-body wavefunctions [F. Mazzanti et al., PRL 102, 110405 (2009), D. Hufnagl et al., PRL 107, 065303 (2011, where the underlying physics of the excitation spectrum and the role of the condensate has not been addressed.

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“…However, they change sign and transfer intensity from the two PR band to the sharp, single mode in the roton region. This process appears to contribute since the intensity in the single roton mode increases with increasing p. Third, for PR modes with high energy (close to 2), the total mode intensity of both the sharp component and the component in the two PR band, appears to be proportional to the condensate fraction [26,28]. At higher p, n 0 becomes very small and we expect reduced PR intensity when !…”

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Excitations of Metastable SuperfluidH4eat Pressures Up to 40 Bars

et al. 2004

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Neutron scattering measurements of the fundamental excitations of liquid 4He confined in 44 A pore diameter gelsil glass at pressures up to 40 bars in the wave vector range 0.41.6 A(-1), especially the rotons, are observed up to complete solidification of all the liquid at a pressure of approximately 40 bars where the roton vanishes. At and above a pressure of 35.1 bars, Bragg peaks are observed, indicating coexistence of liquid and solid in the pores at pressures 35 less than or approximately equal P less than or approximately equal 40 bars.

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Excitations and Bose-Einstein condensation in liquidHe4

Cited by 12 publications

References 27 publications

Phonon-roton modes in liquid ⁴ He coincide with Bose-Einstein condensation

Phonon-roton modes in liquid ⁴ He coincide with Bose-Einstein condensation

Collective and single-particle excitations in two-dimensional dipolar Bose gases

Excitations of Metastable SuperfluidH4eat Pressures Up to 40 Bars

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Excitations and Bose-Einstein condensation in liquidHe4

Cited by 12 publications

References 27 publications

Phonon-roton modes in liquid 4 He coincide with Bose-Einstein condensation

Phonon-roton modes in liquid 4 He coincide with Bose-Einstein condensation

Collective and single-particle excitations in two-dimensional dipolar Bose gases

Excitations of Metastable SuperfluidH4eat Pressures Up to 40 Bars

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Product

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Phonon-roton modes in liquid ⁴ He coincide with Bose-Einstein condensation

Phonon-roton modes in liquid ⁴ He coincide with Bose-Einstein condensation