846 research outputs found

    Tunneling, dissipation, and superfluid transition in quantum Hall bilayers

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    We study bilayer quantum Hall systems at total Landau level filling factor ν=1\nu=1 in the presence of interlayer tunneling and coupling to a dissipative normal fluid. Describing the dynamics of the interlayer phase by an effective quantum dissipative XY model, we show that there exists a critical dissipation σc\sigma_c set by the conductance of the normal fluid. For σ>σc\sigma > \sigma_c, interlayer tunnel splitting drives the system to a ν=1\nu=1 quantum Hall state. For σ<σc\sigma <\sigma_c, interlayer tunneling is irrelevant at low temperatures, the system exhibits a superfluid transition to a collective quantum Hall state supported by spontaneous interlayer phase coherence. The resulting phase structure and the behavior of the in-plane and tunneling currents are studied in connection to experiments.Comment: 4 RevTex pages, revised version, to appear in Phys. Rev. Let

    Stimulation of Lettuce Seed Germination by Ethylene

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    Biochemical Pathway of Stress-induced Ethylene

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    Abscission: Role of Cellulase

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    Superconductivity-Related Insulating Behavior

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    We present the results of an experimental study of superconducting, disordered, thin-films of amorphous Indium Oxide. These films can be driven from the superconducting phase to a reentrant insulating state by the application of a perpendicular magnetic field (BB). We find that the high-BB insulator exhibits activated transport with a characteristic temperature, TIT_I. TIT_I has a maximum value (TIpT_{I}^p) that is close to the superconducting transition temperature (TcT_c) at BB = 0, suggesting a possible relation between the conduction mechanisms in the superconducting and insulating phases. TIpT_{I}^p and TcT_c display opposite dependences on the disorder strength.Comment: Tex file and 5 figures; Revised version; To appear in Phys. Rev. Lett. (2004

    Effect of Ethylene on Auxin Transport

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    Auxin Stimulation of Ethylene Evolution

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    Inhibition of Flowering in Xanthium pensylvanicum

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    Light-induced Ethylene Production in Sorghum

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    Enhancement of RNA Synthesis, Protein Synthesis, and Abscission by Ethylene

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