Related Experiment Video
Updated: Jul 7, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Spectroscopy of collective excitations in interacting low-dimensional many-body systems using quench dynamics
Vladimir Gritsev1, Eugene Demler, Mikhail Lukin
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Abstract:
We study the problem of rapid change of the interaction parameter (quench) in a many-body low-dimensional system. It is shown that, measuring the correlation functions after the quench, the information about a spectrum of collective excitations in a system can be obtained. This observation is supported by analysis of several integrable models and we argue that it is valid for nonintegrable models as well. Our conclusions are supplemented by performing exact numerical simulations on finite systems. We propose that measuring the power spectrum in a dynamically split 1D Bose-Einsten condensate into two coupled condensates can be used as an experimental test of our predictions.
Related Concept Videos
UV–Vis Spectroscopy: Molecular Electronic Transitions
Fermi Level Dynamics
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence
Molecular Spectroscopy: Absorption and Emission
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
NMR Spectroscopy: Spin–Spin Coupling

