Results 151 to 160 of about 469,777 (370)
Ultrafast dynamic evolution of multilevel systems in medium-strength laser fields
New Journal of Physics, 2019 The ultrafast dynamic evolution of an atomic system under medium-strength laser fields is studied by performing transient absorption measurement. An analytical model developed from perturbation theory with a modified transition dipole moment is presented
Zhenhao Wang +7 more
doaj +1 more source
Intersubband Optical Nonlinearity of GeSn Quantum Dots under Vertical Electric Field
Micromachines, 2019 The impact of vertical electrical field on the electron related linear and 3rd order nonlinear optical properties are evaluated numerically for pyramidal GeSn quantum dots with different sizes.
Mourad Baira +3 more
doaj +1 more source
Neutrinos interacting with Polarizable Media [PDF]
arXiv, 1994 We study Cherenkov and transition radiation of neutral spin 1/2 particles which carry magnetic moments or electric dipole moments. In particular, we estimate the radiation caused by the solar neutrino flux in dielectric media.
arxiv
Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications
Advanced Functional Materials, EarlyView.Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai +8 more
wiley +1 more source
Rare CP-violated η and η′ meson decays and neutron EDM.
EPJ Web of Conferences, 2018 The data for the upper limit on the electric dipole moment of the neutron (nEDM) can be explained by using different mechanisms beyond the Standard Model (SM). The nEDM can be generated by a CP-violating transition of η and η′ mesons into pion pairs.
Zhevlakov Alexey S. +3 more
doaj +1 more source
Advanced Functional Materials, EarlyView.The dynamic polarization reversal of coexisting normal and relaxor ferroelectrics in 1D TMAPbI₃ (tetramethylammonium, TMA) is deciphered through combined experimental and theoretical approaches. By bridging atomic‐scale motion, macroscopic polarization switching, and depolarization effects, a universal methodology is established to engineer next ...
Chen Xue +8 more
wiley +1 more source
Electric toroidal dipole order and hidden spin polarization in ferroaxial materials [PDF]
arXivWe investigate the role of electric toroidal dipoles in the prototypical ferroaxial materials NiTiO$_3$ and K$_2$Zr(PO$_4$)$_2$, which undergo ferroaxial structural phase transitions of order-disorder and displacive type, respectively. Using first-principles electronic structure theory, we compute the evolution across the ferroaxial transitions of the ...
arxiv
Analytical dipole moment functions for diatomic molecules : [PDF]
, 1981 We require the y-series expansion to satisfy the condition that the infinite sum of its coefficients M(, n) vanishes. Then, expressing M(, n) as some function of the index n and several parameters, we fit this function to a few known transition moments ...
Tran, Loc Binh,
core
Advanced Functional Materials, EarlyView.This study presents a novel donor‐bridge‐acceptor‐bridge‐donor (D‐B‐A‐B‐D) molecular system, which shows near‐unity intramolecular excitation energy transfer (IET) from two identical energy donors to a coplanar acceptor. It enables a four‐level energy system for efficient lasing at the acceptor emission band in a microspherical cavity with a low lasing
Vishal Kumar +6 more
wiley +1 more source
Optical Control of Ferroelectric Imprint in BiFeO3
Advanced Functional Materials, EarlyView.Above‐bandgap irradiation at room temperature enables on‐demand optical control of defect‐driven built‐in electric fields in BiFeO₃ thin films, fabricated via scalable, chemical spray pyrolysis. These fields, otherwise “frozen‐in,” can cause severe device degradation, including non‐switchable polarization, dead layers near interfaces, and polarization ...
Haoze Zhang +8 more
wiley +1 more source