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Continuous-wave perovskite polariton lasers.
Sci Adv
January 2025
State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, International Research Center for Advanced Photonics, Zhejiang University, Hangzhou 310027, China.
Solution-processed semiconductor lasers are next-generation light sources for large-scale, bio-compatible and integrated photonics. However, overcoming their performance-cost trade-off to rival III-V laser functionalities is a long-standing challenge. Here, we demonstrate room-temperature continuous-wave perovskite polariton lasers exhibiting remarkably low thresholds of ~0.
View Article and Find Full Text PDFLandau Rainbow Induced by Artificial Gauge Fields.
Phys Rev Lett
December 2024
New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China.
The ability to generate Landau levels using a pseudomagnetic field (PMF), also called an artificial gauge field, opens up new pathways for exploring fundamental physics and developing novel applications based on topological protection. In this Letter, we simultaneously realize a PMF and a pseudoelectric field (PEF) on a photonic crystal platform and observe a rainbow effect of the Landau zeroth modes. While a PMF induces a series of discretized Landau levels of photons in a similar way as the quantum Hall effect for electrons, a PEF breaks the degeneracy of the flat band of Landau levels over a broad range.
View Article and Find Full Text PDFSpectroscopic and Quantum Chemical Evidence of Amine-CO and Alcohol-CO Interactions: Confirming an Intriguing Affinity of CO to Monoethanolamine (MEA).
Molecules
November 2024
Department of Chemistry, Technical University of Denmark, Kemitorvet 206, 2800 Kongens Lyngby, Denmark.
A recent broadband rotational spectroscopic investigation of the cross-association mechanisms of CO with monoethanolamine (MEA) in molecular beams [F. Xie et al., , , , e202218539] revealed an intriguing affinity of CO to the hydroxy group.
View Article and Find Full Text PDFElectric-Field-Induced Switchable Two-Dimensional Altermagnets.
Nano Lett
January 2025
National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
Altermagnetism, as a recently discovered unconventional antiferromagnetism, allows the lifting of spin degeneracy without net magnetization. The spin splitting of the intrinsic altermagnets is protected by the spin space group symmetry and is therefore difficult to control externally. Here, we propose an extrinsic altermagnet as a complement to the intrinsic altermagnet, whose spin splitting is induced by and can be significantly modulated by the electric field.
View Article and Find Full Text PDFφ Josephson Junction Induced by Altermagnetism.
Phys Rev Lett
November 2024
Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
We study the Josephson effect in a superconductor-altermagnet-superconductor junction. We find anomalous phenomena, including 0-π transition and multinodal current-phase relations. Similar to a d-wave superconductor, a d-wave altermagnet can support a φ junction where free-energy minima locate neither φ=0 nor ±π with double degeneracy.
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