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Observation of Momentum Space Josephson Effects in Weakly Coupled Bose-Einstein Condensates.
Phys Rev Lett
June 2024
Department of Physics and Astronomy, Washington State University, Pullman, Washington 99164-2814, USA.
Article Synopsis
- The momentum space Josephson effect reveals supercurrent flow between weakly coupled Bose-Einstein condensates (BECs) at distinct momentum states, which was experimentally observed using a BEC with Raman-induced spin-orbit coupling.
- The researchers induced coherent spin-momentum oscillations through a sudden change in Raman detuning, demonstrating both plasma and regular Josephson oscillations under various conditions.
- The findings align with theoretical models and highlight the impact of nonlinear interactions, while enabling measurements of the Josephson plasma frequency that relate to important concepts in particle physics, such as the mass of pseudo-Goldstone modes.
Interfacial Fluid Rheology of Soft Particles.
Phys Rev Lett
December 2023
Department of Biomedical Science, Faculty of Health and Society, Malmö University, SE-205 06 Malmö, Sweden.
In situ interfacial rheology and numerical simulations are used to investigate microgel monolayers in a wide range of packing fractions, ζ_{2D}. The heterogeneous particle compressibility determines two flow regimes characterized by distinct master curves. To mimic the microgel architecture and reproduce experiments, an interaction potential combining a soft shoulder with the Hertzian model is introduced.
View Article and Find Full Text PDFQuantum 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.
Catalyst Regeneration via Chemical Oxidation Enables Long-Term Electrochemical Carbon Dioxide Reduction.
J Am Chem Soc
July 2022
Department of Chemical Engineering, Queen's University, Kingston K7L 3N6, ON, Canada.
Electrochemical CO reduction (ECR) with industrially relevant current densities, high product selectivity, and long-term stability has been a long-sought goal. Unfortunately, copper (Cu) catalysts for producing valuable multicarbon (C) products undergo structural and morphological changes under ECR conditions, especially at high current densities, resulting in a rapid decrease in product selectivity. Herein, we report a catalyst regeneration strategy, one that employs an electrolysis method comprising alternating "on" and "off" operating regimes, to increase the operating stability of a Cu catalyst.
View Article and Find Full Text PDFA long-sought regime of electronic behaviour.
Nat Mater
March 2022
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA.
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