The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Two-dimensional action spectroscopy of excitonic systems : Explicit simulation using a phase-modulation technique

Author

  • Fikeraddis A. Damtie
  • Andreas Wacker
  • Tõnu Pullerits
  • Khadga J. Karki

Summary, in English

Two-dimensional (2D) spectroscopy has been intensively used to study electronic and vibronic coherences in biological systems and semiconductors. This technique studies coherent as well as incoherent signals that arise from the nonlinear interaction of a sequence of laser pulses. In this paper we present a direct evaluation of the 2D signal based on elementary quantum kinetics in order to compare with the common approximate diagrammatic approaches. Here we consider incoherent action signals such as fluorescence or photocurrent as the observable, which is easily accessible in a measurement. These observables are calculated by solving the time evolution of the density matrix in the Lindblad form, which can take into account all possible decoherence processes. The phase modulation technique is used to separate the relevant nonlinear signals from the other possible interaction pathways. The approach can be used to calculate 2D spectra of any quantum system. For our model system we find a good agreement for the quantum beating between the coupled states.

Department/s

  • Mathematical Physics
  • NanoLund: Center for Nanoscience
  • Chemical Physics

Publishing year

2017-11-13

Language

English

Publication/Series

Physical Review A

Volume

96

Issue

5

Document type

Journal article

Publisher

American Physical Society

Topic

  • Atom and Molecular Physics and Optics

Status

Published

Project

  • Quantum Biology - ASG, Pufendorf IAS

ISBN/ISSN/Other

  • ISSN: 2469-9926