Finding <i>T</i><sub>c</sub> in an attractive-<i>U </i>Hubbard-metallic bilayer system.

ORAL

Abstract

An intriguing route to higher temperature superconductivity is via coupling layers of different material properties. From a model standpoint, others have shown coupling layers with a large pairing scale, and weak superfluid stiffness to a metal can recover part of the mean-field transition temperature when coupled to a thin metallic film. But how general is this result? We examine this question by studying a bilayer system comprised of an attractive Hubbard layer and a metallic layer coupled with an interlayer hopping using the dynamical cluster approximation. Focusing on the regime where the interaction magnitude is comparable to the electronic bandwidth, we find that coupling between the layers suppresses Tc and that the transition evolves from a Kosterlitz-Thouless type to a logarithmic BCS (mean-field) type transition. We will discuss the reasons for this suppression and potential future directions.

**This work was supported by the U.S. Department of Energy's SCGSR and SciDAC programs. The SCGSR program is administered by the Oak Ridge Institute for Science and Education for the DOE under contract number DE-SC0014664.

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Presenters

  • Philip Dee

    • University of Tennessee

Authors

  • Philip Dee

    • University of Tennessee

  • Steven S. Johnston

    • Department of Physics and Astronomy, University of Tennessee
    • Department of Physics and Astronomy and Joint Institute of Advanced Materials, The University of Tennessee, Knoxville, Tennessee 37996, USA
    • University of Tennessee
    • University of Tennessee, Knoxville

  • Thomas Maier

    • Oak Ridge National Lab
    • Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA
    • Computational Sciences and Engineering Division, Oak Ridge National Laboratory