Browsing by Subject "Binary mixtures"

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    Experimental investigation of critical Casimir forces in binary liquid mixtures by blinking optical tweezers
    (OSA, 2017) Magazzu, Alessandro; Schmidt, F.; Callegari, Agnese; Gambassi, A.; Dietrich, S.; Volpe, Giovanni
    We investigate, for the first time and by blinking optical tweezers, the effects of critical Casimir forces (CCFs) on the free dynamics of a pair of spherical colloidal particles, immersed in binary liquid mixtures upon approaching their critical points.
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    High-voltage optical emission in binary gaseous mixtures of N2
    (Elsevier, 1995) Zengin, V.; Gökmen, A.; Dinçer, S.; Süzer, Ş.
    Optical emission in 1:1 binary gaseous mixtures under high voltage displays a varying character depending on pressure, applied voltage polarity, and chemical nature of the mixture. Under negative polarity, in pure N2 and 50% mixture of Ar, O2 and CO2, emission stemming from N2 + is enhanced relative to emission from neutral N2. In mixtures of N2 with gases containing halogens (CCl4, CHCl3, CH2Cl2, CF3H, CF2Cl2 and SF6) a reversal is observed, i.e. the N2 + emission is suppressed. An enhancement factor is defined as the ratio of the emission under negative polarity to positive polarity to quatify this polarity dependence. This enhancement factor varies between 0.01 and 50 depending on the second component in the mixture © 1995 Elsevier Science B.V.
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    Spinor boson droplets stabilized by spin fluctuations
    (American Physical Society, 2022-04-13) Yoğurt, T. A.; Keleş, A.; Oktel, Mehmet Özgür
    Self-trapped droplets stabilized by quantum fluctuations have been experimentally realized in dipolar gases and binary boson mixtures. In this paper, we propose spinor Bose gases as another candidate for droplet formation. For spin-1 gas, we find that spin fluctuations give a dilute but self-trapped state for two different order parameters where the mean-field picture predicts collapse. A polar droplet phase can be stabilized by spin fluctuations for both antiferromagnetic and ferromagnetic spin-dependent coupling. An antiferromagnetic droplet phase can be stabilized similarly with a negative quadratic Zeeman shift. Furthermore, the beyond mean-field energy of the system depends on the quadratic Zeeman coupling, which provides a mechanism to tune the droplet formation and its density. We discuss the parameters necessary for the experimental realization of such spinor droplets.