Results 111 to 120 of about 839,047 (377)

Radiation reaction and quantum damped harmonic oscillator

open access: yes, 2005
By taking a Klein-Gordon field as the environment of an harmonic oscillator and using a new method for dealing with quantum dissipative systems (minimal coupling method), the quantum dynamics and radiation reaction for a quantum damped harmonic ...
F. KHEIRANDISH   +5 more
core   +1 more source

Excitation‐Wavelength‐Tunable Lasing in Individual Quantum Dot Superparticles

open access: yesAdvanced Optical Materials, EarlyView.
Mesoscale superparticles assembled from CdSe quantum dots are shown to behave as microlasers with emission properties that can be tuned by changing the excitation wavelength. Abstract Microcavities enable precise control over light‐matter interactions, supporting a wide range of applications in photonics and optoelectronics.
Marco Reale   +5 more
wiley   +1 more source

Hierarchical Control for Virtual Oscillator Based Grid-Connected and Islanded Microgrids

open access: yesIEEE transactions on power electronics, 2020
Virtual oscillator control (VOC) is a nonlinear time domain controller that achieves significantly faster primary control response in islanded microgrids, compared to droop or virtual synchronous machine (VSM) control.
M. Awal   +4 more
semanticscholar   +1 more source

Radial power-law position-dependent mass; Cylindrical coordinates, separability, and spectral signatures

open access: yes, 2011
We discuss the separability of the position-dependent mass Hamiltonian in cylindrical coordinates in the framework of a radial power-law position-dependent mass. We consider two particular radial mass settings; a harmonic oscillator type, and a Coulombic
Mustafa, Omar
core   +1 more source

Thermally Activated Delayed Fluorescence and Beyond. Photophysics and Material Design Strategies.

open access: yesAdvanced Photonics Research, EarlyView.
Photophysical properties of TADF molecules are determined by characteristic parameters that are discussed in detail(. Moreover, using femtosecond time‐resolved spectroscopy, quantum mechanical considerations, and state‐of‐art calculations, deeper understanding allows us to design breakthrough Cu(I) and organic TADF‐ OLED materials. For the latter ones,
Hartmut Yersin, Uwe Monkowius
wiley   +1 more source

Stochastic Electrodynamics: Lessons from Regularizing the Harmonic Oscillator

open access: yesAtoms, 2019
In this paper, the harmonic oscillator problem in Stochastic Electrodynamics is revisited. Using the exact shape of the Lorentz damping term prevents run-away effects.
Theodorus Maria Nieuwenhuizen
doaj   +1 more source

Transitionless quantum drivings for the harmonic oscillator

open access: yes, 2009
Two methods to change a quantum harmonic oscillator frequency without transitions in a finite time are described and compared. The first method, a transitionless-tracking algorithm, makes use of a generalized harmonic oscillator and a non-local potential.
A Ruschhaupt   +12 more
core   +1 more source

Self‐Detecting Mid‐Infrared Dual‐Comb Spectroscopy Based on High‐Speed Injection‐Locked Quantum Cascade Lasers

open access: yesAdvanced Photonics Research, EarlyView.
A compact self‐detecting dual‐comb spectroscopy (DCS) system based on dispersion‐engineered, high‐speed packaged quantum cascade lasers (QCLs) at λ≈4.6 μm under coherent injection locking is demonstrated. Broad multiheterodyne comb signal with reduced tooth linewidths by orders of magnitude is recorded.
Yu Ma   +14 more
wiley   +1 more source

Topological Berry Antenna on a Silicon Chip for Terahertz Wireless Communication

open access: yesAdvanced Photonics Research, EarlyView.
The on‐chip topological Berry antenna for 6G to Xth‐generation wireless communication is designed via integrating various Berry curvatures for an enhanced antenna aperture and radiation gain. This THz antenna has demonstrated a maximum gain of 17 dBi and chip‐to‐chip wireless communications at 20 Gbps over a distance of 15 cm.
Sonu Kumar   +8 more
wiley   +1 more source

Superintegrable Oscillator and Kepler Systems on Spaces of Nonconstant Curvature via the Stäckel Transform

open access: yesSymmetry, Integrability and Geometry: Methods and Applications, 2011
The Stäckel transform is applied to the geodesic motion on Euclidean space, through the harmonic oscillator and Kepler-Coloumb potentials, in order to obtain maximally superintegrable classical systems on N-dimensional Riemannian spaces of nonconstant ...
Ángel Ballesteros   +4 more
doaj   +1 more source

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