1,034 research outputs found

    Response functions of an artificial Anderson atom in the atomic limit

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    We consider the spin and pseudospin (charge) response functions of the exactly soluble Anderson atom model. We demonstrate, in particular, that a deviation from the magnetic Curie-law behaviour, appropriate for a free spin one-half, increases with increasing asymmetry and temperature. In general, oscillator strength is transferred from the spin degrees of freedom to the pseudospin modes. We also consider the negative-U Anderson atom and demonstrate that the pseudospin modes are the relevant low-energy excitations in this case. Especially, the roles of the spin and charge excitations are interchanged upon reversal of the intrasite Coulomb repulsion, U.Comment: 23 pages, 12 figures. Accepted for publication in J. Low Temp. Phy

    Internal Magnus effects in superfluid 3A

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    Orbital angular momentum of the coherently aligned Cooper pairs in superfluid 3A is encountered by an object immersed in the condensate. We evaluate the associated quasiparticle-scattering asymmetry experienced by a negative ion; this leads to a measureable, purely quantum-mechanical reactive force deflecting the ion’s trajectory. Possible hydrodynamic Magnus effects are also discussed.Peer reviewe

    Half-Quantum Vortices in Thin Film of Superfluid 3^3He

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    Stability of a half-quantum vortex (HQV) in superfluid 3^3He has been discussed recently by Kawakami, Tsutsumi and Machida in Phys. Rev. B {\bf 79}, 092506 (2009). We further extend this work here and consider the A2_2 phase of superfluid 3^3He confined in thin slab geometry and analyze the HQV realized in this setting. Solutions of HQV and singly quantized singular vortex are evaluated numerically by solving the Ginzburg-Landau (GL) equation and respective first critical angular velocities are obtained by employing these solutions. We show that the HQV in the A2_2 phase is stable near the boundary between the A2_2 and A1_1 phases. It is found that temperature and magnetic field must be fixed first in the stable region and subsequently the angular velocity of the system should be increased from zero to a sufficiently large value to create a HQV with sufficiently large probability. A HQV does not form if the system starts with a fixed angular velocity and subsequently the temperature is lowered down to the A2_2 phase. It is estimated that the external magnetic field with strength on the order of 1 T is required to have a sufficiently large domain in the temperature-magnetic field phase diagram to have a stable HQV.Comment: 5 pages, 5 figure

    Playing the old tunes: a fiskean analysis of Baz Luhrmann's 2013 cinematic adaptation of the Great Gatsby

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    Scott Fitzgerald's The Great Gatsby has been adapted many times by different directors. However, the two prominent adaptations standing out throughout history are Jay Clayton's 1974 adaptation as the most sincere rendering of the book, and the recently adapted movie by the Broadway director, Baz Luhrmann. The latter adaptation is important in that it has been accomplished in the age of technology, in 3D format, and at the time of the new readings, i.e. cultural or new historical readings, of the novel. This paper is an endeavor to analyze the movie through John Fiske’s theory on media studies. Also, an effort has been made to see whether in this new adaptation, the idea of the new studies of the novel have been shown by the director, or else the movie is a mere representation of struggle for money discussed by the traditional Marxist scholars, metaphorically playing the old tunes

    Attribution of diabetes to the development of severe liver disease in the general population

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    Background and Aims: Diabetes is associated with advanced liver disease and predicts mortality regardless of the primary aetiology of the liver disease. Even a family history of diabetes has been linked to advanced liver fibrosis in non-alcoholic fatty liver disease (NAFLD). However, the fraction of liver-related outcomes in the general population that are attributable to diabetes remains unclear. Methods: The population attributable fraction (PAF) of diabetes for liver disease as a time-dependent exposure was estimated in the Finnish FINRISK study (n = 28 787) and the British Whitehall II study (n = 7855). We also assessed the predictive ability of a family history of diabetes for liver-related outcomes. Incident diabetes data were from drug purchase/reimbursement and healthcare registries (FINRISK) or follow-up examinations (Whitehall II). Incident severe liver outcomes were identified through linkage with national healthcare registries. Results: Diabetes was associated with a two-fold risk of liver-related outcomes in both the FINRISK (HR, 1.92; p <.001) and Whitehall II (HR, 2.37; p <.001) cohorts, and this remained significant after adjusting for multiple confounders. PAF analyses demonstrated that diabetes explained 12–14% of the risk for severe liver-related outcomes after 10 and 20 years of follow-up. Also, maternal diabetes increased the risk of liver-related outcomes in the FINRISK (HR, 1.43; p =.044) and Whitehall II (HR, 2.04; p =.051) cohorts. Conclusion: Approximately 12%–14% of severe liver-related outcomes are attributable to diabetes at the population level. The association between maternal diabetes and liver disease might suggest a mitochondrial genetic mechanism