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Weak Localization of Short Pulses in Disordered Waveguides

100%

Skipetrov S., van Tiggelen B.

Acta Physica Polonica A

2006

vol. 109

issue 1

101-108

We consider the phenomenon of weak localization of a short wave pulse in a quasi-1D disordered waveguide. We show that the long-time decay of the average transmission coefficient is not purely exponential, in contradiction with predictions of the diffusion theory. The diffusion theory breaks down completely for times exceeding the Heisenberg time. We also study the survival probability of a quantum particle in a disordered waveguide and compare our results with previous calculations using the super-symmetric nonlinear sigma model.

Light Propagation in a Magnetic Field: Random Green Matrix Approach

81%

Pinheiro F., Rusek M., Orłowski A., van Tiggelen B.

Acta Physica Polonica A

2004

vol. 105

issue 4

339-347

We studied the spectral properties of the matrices describing multiple scattering of electromagnetic waves from randomly distributed point-like magneto-optically active scatterers under an external magnetic field B. We showed that the complex eigenvalues of these matrices exhibit some universal properties such as the self-averaging behavior of their real parts, as in the case of scatterers without magneto-optical activity. However, the presence of magneto-optically active scatterers is responsible for a striking particularity in the spectra of these matrices: the splitting of the values of the imaginary part of their eigenvalues. This splitting is proportional to the strength of the magnetic field and can be interpreted as a consequence of the Zeeman splitting of the energy levels of a single scatterer.

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2 Acta Physica Polonica A

1 2006

1 2004

2 van Tiggelen B.

1 Orłowski A.

1 Pinheiro F.

1 Rusek M.

1 Skipetrov S.

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Weak Localization of Short Pulses in Disordered Waveguides

Light Propagation in a Magnetic Field: Random Green Matrix Approach