The driven damped quantum harmonic oscillator perturbed by the parity operator, is studied in the framework of the reduced density operator formalism. Benefit is taken of the closed approach of Louisell and Walker to find the dynamics of the system. The starting point is the reduced density ...
By virtue of the entangled-state basis and the ket-vector representation of the density operator, we solve the master equation of a driven damped harmonic oscillator. In this representation, the density operators are mapped to vectors of a two-mode Fock space whose first mode is the system mod...
In this study, we calculate the torque induced on a plasmonic nanocuboid by modelling the surface plasmon resonance (SPR) as a driven damped harmonic oscillator. Using numerical simulations, we demonstrate the model's accuracy in predicting the torque induced for narrow nanocuboids. We also ...
In this condition, the gyroscope can be modeled as a driven damped harmonic oscillator with a time-dependent dynamic stiffness, whose motion can be described by the Mathieu–Hill equation [17], as shown in Equation (1). 𝑚𝑞¨+𝑚𝜔𝑛𝑄𝑞˙+[𝑘0+Δ𝑘sin(2𝜔𝑑𝑡+...
Outcoupling efficiencies of OLEDs were simulated by treating the emission dipole as a forced damped harmonic oscillator embedded in a thin-film stack51,52,53. The simulation was conducted within a wavelength range of 300–800 nm with a 1-nm step and, at each wavelength, dissipation powers ...
The system behaves as a damped driven harmonic oscillator which can be described by the differential equation: m(d^2x/dt^2)+b(dx/dt)+kx=f(t) The analytical solution to this differential equation is of the form: x(t)=x_h(t)+x_p(t) x_h(t)= exp(-alp...
Colloidal particle in a harmonic trap driven through a viscoelastic fluid. a Micrometre-sized particle in a micellar solution and subjected to a harmonic potential, which moves with constant velocity v. b Measured trap potential (symbols) and a parabolic fit (solid line), from which the trap st...
2a shows that the magnitude of the bandgap falls sharply, approaching almost zero at 60 fs after photoexcitation, but then quickly increases to 0.3 eV followed by a damped oscillation within the range from 0.1 to 0.5 eV thereafter. Along with this behavior of bandgap, the bond ...
Stochastic resonance in an under-damped bistable system driven by harmonic mixing signal 混合信号双稳态欠阻尼泛音回声系统随机驾驶摘要:Yan-Fei JinDepartment of Mechanics中国物理B(英文版)
In the absence of thermal fluctuations, these frequencies, ωi±, relate to damped oscillations in which the coupled coordinates spiral into the fixed point (Supplementary Note (III D)). The rate at which they do so, depends on the imaginary part of ωi±, which describes motional damping....