Results 41 to 50 of about 1,782,899 (173)

Quantum dynamics of the damped harmonic oscillator

New Journal of Physics, 2012
The quantum theory of the damped harmonic oscillator has been a subject of continual investigation since the 1930s. The obstacle to quantization created by the dissipation of energy is usually dealt with by including a discrete set of additional harmonic
T G Philbin
doaj   +1 more source

Generative AI‐Enabled Discovery and Experimental Demonstration of Ultra‐Broadband Epsilon‐Near‐Zero Perfect Absorbers

Advanced Science, EarlyView.
Researchers developed and applied a generative artificial intelligence (AI) model to optimize epsilon‐near‐zero thin film stacks for ultra‐broadband perfect absorption of light. The fabricated AI‐designed absorber, with a total thickness of only 160 nm, experimentally demonstrated an absorption bandwidth exceeding 1000 nm while maintaining greater than
David Dang, Meena Salib, Quynh Dang, Sudip Gurung, Juan Calixto, Xuguo Zhou, Stuart Love, Massee Akbar, Aleksei Anopchenko, Wilton J.M. Kort‐Kamp, Ho Wai Howard Lee   +10 more
wiley   +1 more source

Is there a conflict between causality and diamagnetism?

New Journal of Physics
There is a long-standing apparent conflict between the existence of diamagnetism and causality as expressed through the Kramers–Kronig relations. In essence, using causality arguments, along with a small number of seemingly well-justified assumptions ...
Niclas Westerberg, Stephen M Barnett
doaj   +1 more source

Relativistic force between fast electrons and planar targets

New Journal of Physics, 2014
The full retarded electromagnetic force experienced by swift electrons moving parallel to planar boundaries is revisited, for both metallic and dielectric targets, with special emphasis on the consequences in electron microscopy experiments. The focus is
A Rivacoba, N Zabala
doaj   +1 more source

Mode‐Resolved Phonon Dynamics Under Chemical Pressure in SnTe Thermoelectrics

Advanced Science, EarlyView.
Chemical pressure reshapes low‐energy optical phonons in SnTe, altering their dispersion and scattering with heat‐carrying acoustic modes. Positive and negative pressure states modify phonon frequencies and lifetimes in distinct ways, revealing how mode‐selective lattice perturbations regulate acoustic–optical interactions and suppress lattice thermal ...
Zhihao Li, Jianhong Hu, Panpan Peng, Peng Cao, Hui Zhang, Yujie Zong, Yanhui Wu, Hongchao Wang   +7 more
wiley   +1 more source

Space-resolved chemical information from infrared extinction spectra

Scientific Reports, 2023
A new method is presented for the extraction of the complex index of refraction from the extinction efficiency, $$Q_{ext} {({\tilde{\nu }})}$$ Q ext ( ν ~ ) , of homogeneous and layered dielectric spheres that simultaneously removes scattering effects ...
Yushmantha Ishan Kalpa de Silva Thuiya Hennadige, Proity Nayeeb Akbar, Reinhold Blümel   +2 more
doaj   +1 more source

pyFDRT: An open‐source Python tool for Fourier‐transform analysis of the distribution of relaxation times in electrochemical impedance spectra

Bulletin of the Korean Chemical Society, EarlyView.
pyFDRT is an open‐source tool that converts an impedance spectrum into a quantitative equivalent circuit. Its Fourier‐transform stage requires no discretization basis or regularization parameter, and the non‐negative refinement selects its own parameters, and an information criterion determines the relaxation process count.
Chung‐Yul Yoo, Jaeku Park, Jeongjin Kim   +2 more
wiley   +1 more source

Tuning Stability and Optoelectronic Properties of CsSnI3 Via Rare‐Earth Doping

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Sn‐based halide perovskites are promising optoelectronic materials but are limited by poor stability. Thus, rare‐earth elements (RE) doping in CsSnI3 addresses this limitation, significantly enhancing thermodynamic, mechanical, and chemical stability, while simultaneously tuning electronic characteristics and modulating optical responses in the ...
Haowei Wang, Feiyu Zhou, Zhuo Li, Yanghao Luo, Tongtong Li, Yilun Liu, Shengying Yue   +6 more
wiley   +1 more source

DFT and Machine Learning Analysis of Eco‐Friendly Formamidinium Tin Iodide Perovskite Solar Cells: Optimizing Charge Transport Layers Through SCAPS‐1D Simulations

Energy Science &Engineering, EarlyView.
Machine learning using Random Forest, GB, XGBoost, and LightGBM regression algorithms: SHAP plot for PCE. ABSTRACT Tin‐based solar cells are the eco‐friendly alternative to the toxic lead‐based cells that are currently in use. In this context, Formamidinium Tin Iodide (FASnI3) emerges as a promising candidate due to its superior performance, exhibiting
Rabeya Khan, Md Rasidul Islam, I.K. Gusral Ghosh Apurba, Md. Amimul Ihsan, Rahat Ul Nasib, Mohammad Arefin, Md Rifatul Islam, Abu Zahid, Hasnain A. Ziad, Jehan Y. Al‐Humaidi   +9 more
wiley   +1 more source

Determining the refractive index of human hemoglobin solutions by Kramers-Kronig relations with an improved absorption model. [PDF]

Applied Optics, 2016
The real part of the refractive index of aqueous solutions of human hemoglobin is computed from their absorption spectra in the wavelength range 250-1100 nm using the Kramers-Kronig (KK) relations, and the corresponding uncertainty analysis is provided ...
J. Gienger, H. Gross, J. Neukammer, M. Bär   +3 more
semanticscholar   +1 more source