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Related Experiment Video

Updated: Jul 16, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

Published on: February 10, 2020

Probing anomalous relaxation by coherent multidimensional optical spectroscopy.

Frantisek Sanda¹, Shaul Mukamel

¹Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, Prague, 121 16 Czech Republic. sanda@karlov.mff.cuni.cz

Physical Review Letters

|March 16, 2007

Summary

This study investigates the algebraic decay in glasses, proteins, and quantum dots using ultrafast laser pulses. We predict spectroscopic signatures revealing stochastic spectral jumps and aging effects in complex systems.

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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

Area of Science:

Condensed matter physics
Biophysics
Quantum optics

Background:

Algebraic decay of two-point correlation functions is observed in diverse disordered systems like glasses, proteins, and quantum dots.
Understanding the origin of this decay is crucial for characterizing system dynamics.

Purpose of the Study:

To investigate the origin of algebraic decay in correlation functions.
To explore the nonlinear response of these systems to ultrafast laser pulses.

Main Methods:

Utilizing ultrafast laser pulse sequences to probe system dynamics.
Applying a continuous time random walk (CTRW) model with stochastic spectral jumps.
Analyzing a two-level system with a power-law distribution of waiting times (ψ(t) ∝ t^{-α-1}).

Main Results:

Predicted power-law spectral singularities in two-dimensional correlation spectroscopy (2DCS) signals.
Predicted temporal relaxation in 2DCS signals.
Identified distinct spectroscopic signatures for stationary (1<α<2) and nonstationary (0<α<1) ensembles.

Conclusions:

The study provides a theoretical framework linking ultrafast spectroscopy to the microscopic dynamics of disordered systems.
Spectroscopic signatures can differentiate between stationary and aging dynamics governed by power-law waiting times.
The CTR model successfully explains the observed algebraic decay and predicts observable phenomena.