Localized-density-matrix method and nonlinear optical response

Localized-density-matrix method and its application to nanomaterials

The localized-density-matrix (LDM) method has been developed to calculate the excited state properties of very large systems containing thousands of atoms. It is particularly suitable for simulating the dynamic electronic processes in nanoscale materials, and has been applied to poly(p-phenylenevynelene) (PPV) aggregates and carbon nanotubes. Absorption spectra of PPVs and carbon nanotubes have...

Nonlinear optical switching matrix.

We show that nonlinear directional couplers with variable coupling coefficients can be used to compose a special kind of switching matrix. The switching matrix can be controlled by the signal itself or by a strong pump. Light routing is realized by adjustment of the power of the signal or the pump. Because light routing is based on the optical Kerr effect, ultrafast routing is possible.

Localized-density-matrix implementation of time-dependent density-functional theory

Power Spectral Density of Nonlinear System Response: The Recursion Method

Spectral densities of the response of nonlinear systems to white noise excitation are considered. By using a formal solution of the associated Fokker-Planck-Kolmogorov equation, response spectral densities are represented by formal power series expansion for large frequencies. The coe cients of the series, known as the spectral moments, are determined in terms of rst-order response statistics. ...

Modulating charge density and inelastic optical response in graphene by atmospheric pressure localized intercalation through wrinkles