Probing anomalous relaxation by coherent multidimensional optical spectroscopy

Details Probing anomalous relaxation by coherent multidimensional optical spectroscopy Probing anomalous relaxation by coherent multidimensional optical spectroscopy

2007-01-11

arxiv.org/abs/cond-mat/0701255v1

Phys. Rev. Lett. 98, 080603 (2007)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.98.080603

We propose to study the origin of algebraic decay of two-point correlation functions observed in glasses, proteins, and quantum dots by their nonlinear response to sequences of ultrafast laser pulses. Power-law spectral singularities and temporal relaxation in two-dimensional correlation spectroscopy (2DCS) signals are predicted for a continuous time random walk model of stochastic spectral jumps in a two level system with a power-law distribution of waiting times $\psi (t)\sim t^{-\alpha -1}$. Spectroscopic signatures of stationary ensembles for $1<\alpha <2$ and aging effects in nonstationary ensembles with $0<\alpha <1$ are identified.

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