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Imaging interlayer exciton superfluidity in a 2D semiconductor heterostructure.
Sci Adv
January 2025
Department of Physics, University of Arizona, Tucson, AZ 85721, USA.
Article Synopsis
- Excitons, which are pairs of electrons and holes held together by Coulomb forces, can form a superfluid at low temperatures due to their bosonic properties.
- The research involves directly imaging this exciton superfluid in a specific material setup (MoSe-WSe heterostructure), demonstrating a significant level of order across the sample.
- The study also details how variations in exciton density and temperature help construct a phase diagram, revealing that the superfluid state can persist up to 15 K, aligning well with theoretical expectations and paving the way for advancements in quantum devices and superfluid research.
Transient Exciton-Charge Interconversion in Single-Crystal Hybrid Perovskites.
J Phys Chem Lett
November 2024
Institute of Information Photonics Technology, School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, P. R. China.
Ultrafast oscillatory transient absorption (TA) dynamics are observed in single crystals of hybrid organic-inorganic perovskite (CHNH)PbX with X = I, Br, Cl. High-density photoinduced charges, low binding energy of the excitons, efficient generation and high mobility of charges, and long diffusion length of both excitons and charges led to transient interconversion between excitons and charges with high efficiency, which is responsible for the oscillatory TA dynamics at re-excitation by the probe pulses. The pump pulses initiated a quasi-equilibrium scheme of coexisting excitons and charges with high densities, the probe pulse triggered a perturbation through interconversion between these two kinds of excited "particles," which was overlapped on the intrinsic exciton relaxation dynamics, producing an oscillatory modulation with time delay.
View Article and Find Full Text PDFAmmonia-sensitive halide CsCuI film for gas sensor and stimuli-responsive anti-counterfeiting.
Talanta
January 2025
Engineering Research Center for Nanophotonics and Advanced Instrument of Ministry of Education, Key Laboratory of Polar Materials and Devices (Ministry of Education), School of Physics and Electronic Science, East China Normal University, Shanghai, 201100, China. Electronic address:
Eco-friendly lead-free halide perovskites have emerged as promising materials for multiple applications due to their unique optoelectronic properties. In this work, we investigate the ammonia (NH)-sensitive CsCuI film for its potential in NH sensor and stimuli-responsive fluorescence anti-counterfeiting. CsCuI-based NH sensor demonstrates a high response to NH (△R/R = 1.
View Article and Find Full Text PDFBlue Perovskite Lasing Derived from Bound Excitons through Defect Engineering.
ACS Nano
August 2024
School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310027, P. R. China.
All-inorganic perovskite films have emerged as promising candidates for laser gain materials owing to their outstanding optoelectronic properties and straightforward solution processing. However, the performance of blue perovskite lasing still lags far behind due to the inevitable high density of defects. Herein, we demonstrate that defects can be utilized instead of passivated/removed to form bound excitons to achieve excellent blue stimulated emission in perovskite films.
View Article and Find Full Text PDFAn advanced 3D DNA nanoplatform for spatiotemporally confined enhanced dual-mode biosensing MicroRNA in cancer cell.
Biosens Bioelectron
November 2024
Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252000, China. Electronic address:
Article Synopsis
- - A new 3D DNA nanoplatform, resembling "periodic focusing heliostats," has been created to improve the detection of miRNA in cancer cells through enhanced fluorescence (FL) and surface-enhanced Raman spectroscopy (SERS) technology.
- - The platform utilizes gold nanostars (GNS) connected by palindromic DNA sequences, coupled with gold nanoparticles (GNP), to form a robust framework that enhances signal strength and stability in complex biochemical conditions.
- - The detection process is initiated by the hybridization of dsDNA to miRNA-21, resulting in a multifunctional probe that creates high-density "hot spots" for amplified signals, thereby improving the effectiveness of the biosensing technique. *
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