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Determining the nature of excitonic dephasing in high-quality GaN/AlGaN quantum wells through time-resolved and spectrally resolved four-wave mixing spectroscopy

M. Gallart, M. Ziegler, O. Crégut, E. Feltin, J.-F. Carlin, R. Butté, N. Grandjean, B. Hönerlage, and P. Gilliot
Phys. Rev. B 96, 041303(R) – Published 24 July 2017
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Abstract

Applying four-wave mixing spectroscopy to a high-quality GaN/AlGaN single quantum well, we report on the experimental determination of excitonic dephasing times at different temperatures and exciton densities in III-nitride heterostructures. By comparing the evolution with the temperature of the dephasing and the spin-relaxation rate, we conclude that both processes are related to the rate of excitonic collisions. When spin relaxation occurs in the motional-narrowing regime, it remains constant over a large temperature range as the spin-precession frequency increases linearly with temperature, hence compensating for the observed decrease in the dephasing time. From those measurements, a value of the electron-hole exchange interaction strength of 0.45 meV at T=10K is inferred.

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  • Received 26 April 2017

DOI:https://doi.org/10.1103/PhysRevB.96.041303

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

M. Gallart1,*, M. Ziegler1, O. Crégut1, E. Feltin2, J.-F. Carlin2, R. Butté2, N. Grandjean2, B. Hönerlage1, and P. Gilliot1

  • 1IPCMS UMR 7504 CNRS - Université de Strasbourg, 23 rue du Lœss, BP 43, F-67034 Strasbourg Cedex 2, France
  • 2Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

  • *Corresponding author: mathieu.gallart@ipcms.u-strasbg.fr

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Issue

Vol. 96, Iss. 4 — 15 July 2017

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