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Presentation

L’IRSAMC (The Institute of Research on Complex Atomic and Molecular Systems) is a federation of four laboratories (LCAR, LCPQ, LPCNO, LPT), in physics and fundamental chemistry whose research activities are supported both by the Université Paul Sabatier, the CNRS and INSA

Publications of 4 research laboratories

  • Hal-LCAR. - Laboratory Collisions Clusters Reactivity, from 1990 until todays
  • Hal-LCPQ. - Quantum Chemistry and Physics Laboratory, from 2007 until todays
  • Hal-LPCNO. - Physics and Chemistry of Nano Objects Laboratory, from 2006 until todays
  • Hal-LPT.- Theoretical Physics Laboratory, from 2003 until todays

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[hal-02909891] Coulomb electron pairing in a tight-binding model of La-based cuprate superconductors  (01/08/2020)   Moins
We study the properties of two electrons with Coulomb interactions in a tight-binding model of La-based cuprate superconductors. This tight-binding model is characterized by long-range hopping obtained previously by advanced quantum chemistry computations. We show analytically and numerically that the Coulomb repulsion leads to a formation of compact pairs propagating through the whole system. The mechanism of pair formation is related to the emergence of an effective narrow energy band for Coulomb electron pairs with conserved total pair energy and momentum. The dependence of the pair formation probability on an effective filling factor is obtained with a maximum around a filling factor of 20 (or 80) percent. The comparison with the case of the nearest neighbor tight-binding model shows that the long-range hopping provides an increase of the phase space volume with high pair formation probability. We conjecture that the Coulomb electron pairs discussed here may play a role in high temperature superconductivity.

[hal-02908460] Cartographie 2D en champ proche par thermo fluorescence de champs magnétiques  (01/08/2020)   Plus
[hal-02908228] Cover Feature: Hydrogen Isotope Exchange Catalyzed by Ru Nanocatalysts: Labelling of Complex Molecules Containing N ‐Heterocycles and Reaction Mechanism Insights (Chem. Eur. J. 22/2020)  (30/07/2020)   Plus
[hal-02907956] Dynamical Correction to the Bethe-Salpeter Equation Beyond the Plasmon-Pole Approximation  (04/08/2020)   Plus
[hal-02904427] The sonorous beat of optical waves in a Michelson interferometer  (28/07/2020)   Plus

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