Detuning dependence of Rabi oscillations in an InAs self-assembled quantum dot ensemble

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Detuning dependence of Rabi oscillations in an InAs self-assembled quantum dot ensemble

Takeshi Suzuki, Rohan Singh, Manfred Bayer, Arne Ludwig, Andreas D. Wieck, and Steven T. Cundiff

Phys. Rev. B 97, 161301(R) – Published 4 April 2018

Abstract

We study the coherent evolution of an InAs self-assembled quantum dot (QD) ensemble in the ultrafast regime. The evolution of the entire frequency distribution is revealed by performing prepulse two-dimensional (2D) coherent spectroscopy. Charged and neutral QDs display distinct nonlinear responses arising from two-level trion and four-level exciton-biexciton systems, respectively, and each signal is clearly separated in 2D spectra. Whereas the signals for charged QDs are symmetric with respect to the detuning, those for neutral QDs are asymmetric due to the asymmetric four-level energy structure. Experimental results for charged and neutral QDs are well reproduced by solving the optical Bloch equations, including detuning and excitation-induced dephasing (EID) effects. The temperature dependence suggests that wetting-layer carriers play an important role in EID.

Received 13 October 2017
Revised 6 March 2018
Corrected 20 April 2018

DOI:https://doi.org/10.1103/PhysRevB.97.161301

Physics Subject Headings (PhySH)

Biexcitons Excitons

III-V semiconductors Quantum dots

Coherent control Four-wave mixing Optical absorption spectroscopy Photoexcitation

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Corrections

20 April 2018

Correction: The surname of the fourth author contained an error and was corrected.

Authors & Affiliations

Takeshi Suzuki^1,2,*, Rohan Singh^1,2,†, Manfred Bayer³, Arne Ludwig⁴, Andreas D. Wieck⁴, and Steven T. Cundiff^1,2,‡

¹Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
²JILA, National Institute of Standards and Technology and University of Colorado, Boulder, Colorado 80309-0440, USA
³Experimentelle Physik 2, Technische Universtät Dortmund, D-44221 Dortmund, Germany
⁴Lehrstuhl fuer Angewandte Festkoerperphysik, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum, Germany

^*Current address: Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
^†Current address: Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
^‡cundiff@umich.edu

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Issue

Vol. 97, Iss. 16 — 15 April 2018

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