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Feshbach hypothesis of high-Tc superconductivity in cuprates.
Nat Commun
January 2025
Department of Physics and Arnold Sommerfeld Center for Theoretical Physics (ASC), Ludwig-Maximilians-Universität München, München, Germany.
Article Synopsis
- The study explores strong pairing mechanisms in many-body physics, particularly through a Feshbach perspective, focusing on interactions in Fermi-Hubbard models related to doped Mott insulators.
- It theorizes the presence of a low-energy excited state of two holes that facilitates near-resonant interactions, which aligns with observed behaviors in cuprate materials.
- The authors propose experimental methods like cARPES and pair-tunneling measurements to test their theories, suggesting a link between emergent Feshbach resonances and superconductivity in antiferromagnetic Mott insulators.
Visualization of spatial inhomogeneity in the superconducting gap using micro-ARPES.
Sci Technol Adv Mater
August 2024
Research Institute for Synchrotron Radiation Science (HiSOR), Hiroshima University, Higashi-Hiroshima, Japan.
Electronic inhomogeneity arises ubiquitously as a consequence of adjacent and/or competing multiple phases or orders in strongly correlated electron systems. Gap inhomogeneity in high- cuprate superconductors has been widely observed using scanning tunneling microscopy/spectroscopy. However, it has yet to be evaluated by angle-resolved photoemission spectroscopy (ARPES) due to the difficulty in achieving both high energy and spatial resolutions.
View Article and Find Full Text PDFDesigning multicomponent hydrides with potential high T superconductivity.
Proc Natl Acad Sci U S A
November 2024
Department of Physics, University of Illinois Chicago, Chicago, IL 60607.
Article Synopsis
- Scientists are looking for more chemically complex hydrides that can achieve high superconductivity at lower pressures, beyond just hydrogen-rich materials.
- They simplify the task of studying these complex structures by using electronic indicators related to superconductivity, rather than complex calculations.
- The research proposes three classes of hydrides with strong hydrogen connectivity, each designed to potentially enhance superconductivity based on their structural characteristics and electronic properties.
Wafer-Scale MgB Superconducting Devices.
ACS Nano
October 2024
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, United States.
Progress in superconducting device and detector technologies over the past decade has realized practical applications in quantum computers, detectors for far-infrared telescopes, and optical communications. Superconducting thin-film materials, however, have remained largely unchanged, with aluminum still being the material of choice for superconducting qubits and niobium compounds for high-frequency/high kinetic inductance devices. Magnesium diboride (MgB), known for its highest transition temperature ( = 39 K) among metallic superconductors, is a viable material for elevated temperature and higher frequency superconducting devices moving toward THz frequencies.
View Article and Find Full Text PDFVariational Monte Carlo study of stripes as a function of doping in thet-t'Hubbard model.
J Phys Condens Matter
July 2024
Institute for Condensed Matter Physics and Complex Systems, DISAT, Politecnico di Torino, I-10129 Torino, Italy.
We perform variational Monte Carlo simulations of the single-band Hubbard model on the square lattice with both nearest () and next-nearest (') neighbor hoppings. Our work investigates the consequences of increasing hole doping on the instauration of stripes and the behavior of the superconducting order parameter, with a discussion on how the two phenomena affect each other. We consider two different values of the next-nearest neighbor hopping parameter, that are appropriate for describing cuprate superconductors.
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