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Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress.
Rep Prog Phys
December 2023
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China.
Article Synopsis
- - The superconductor-insulator/metal transition (SMT) is a key topic in quantum phase transition research, particularly in two-dimensional (2D) superconductors, highlighting recent advancements in fabrication and measurement techniques.
- - The review emphasizes the discovery of quantum Griffiths singularity (QGS) in ultrathin crystalline Ga films and other 2D superconductors, showcasing its critical role in understanding the effects of quenched disorder on these quantum phase transitions.
- - Additionally, the emergence of anomalous metallic states in high-temperature superconducting films suggests a new classification of metals in low-temperature regimes, with strong evidence supporting the existence of a bosonic nature in the observed quantum metal states.
Critical exponents of dynamical conductivity in 2D percolative superconductor-insulator transitions: three universality classes.
J Phys Condens Matter
November 2016
Department of Physics and Astrophysics, University of North Dakota, Grand Forks, ND 58202, USA.
Article Synopsis
- The study simulates three types of random LC networks on square lattices and calculates their dynamical conductivity using advanced methods to minimize errors.
- The critical exponent "a" is extracted for three different models, showing values of a = 0.314(4) for the site-to-ground model and a = 0 for the bond model, indicating varying behaviors in conductivity.
- The findings suggest that 2D superconductor-insulator transitions have specific characteristics that need to be considered when interpreting experiments with constant conductivity, pointing towards quantum effects rather than classical explanations.
Self-duality and a Hall-insulator phase near the superconductor-to-insulator transition in indium-oxide films.
Proc Natl Acad Sci U S A
January 2016
Department of Physics, Stanford University, Stanford, CA 94305; Department of Applied Physics, Stanford University, Stanford, CA 94305
We combine measurements of the longitudinal (ρxx) and Hall (ρxy) resistivities of disordered 2D amorphous indium-oxide films to study the magnetic-field tuned superconductor-to-insulator transition (H-SIT) in the T --> 0 limit. At the critical field, Hc, the full resistivity tensor is T independent with ρxx(Hc) = h/4e(2) and ρxy(Hc) = 0 within experimental uncertainty in all films (i.e.
View Article and Find Full Text PDFSharp superconductor-insulator transition in short wires.
Phys Rev Lett
May 2007
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 76100, Israel.
Recent experiments on short MoGe nanowires show a sharp superconducting-insulating transition at the universal resistance R(Q)=h/(4e(2)), contrary to the expectation of a smooth temperature dependence of the resistance for such Josephson-like systems. We present a self-consistent renormalization-group treatment of interacting quantum phase slips in short superconducting wires, which reproduces this sharp universal transition. Our method should also apply to other systems in the sine-Gordon universality class, in the previously inaccessible intermediate-coupling regime.
View Article and Find Full Text PDFQuantum metallicity on the high-field side of the superconductor-insulator transition.
Phys Rev Lett
March 2007
Institute of Semiconductor Physics, 630090, Novosibirsk, Russia.
We investigate ultrathin superconducting TiN films, which are very close to the localization threshold. Perpendicular magnetic field drives the films from the superconducting to an insulating state, with very high resistance. Further increase of the magnetic field leads to an exponential decay of the resistance towards a finite value.
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