Off-branch polaritons and multiple scattering in semiconductor microcavities

P. G. Savvidis, C. Ciuti, J. J. Baumberg, D. M. Whittaker, M. S. Skolnick, and J. S. Roberts
Phys. Rev. B 64, 075311 – Published 25 July 2001
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Abstract

Angle-resolved measurements show unexpected emission resonances of the polaritons in a semiconductor microcavity. These resonances appear when more than one in-plane polariton mode is macroscopically occupied. The new resonances observed in angle-resolved luminescence do not lie on the expected polariton branches and possess different dispersion relations with negative effective mass. The experimental results can be well explained using an interacting polariton model that treats multiple scattering. The k dispersion of the luminescence resonances is reproduced using the Bogolubov approximation that deals with the macroscopic coherence of the signal, pump, and idler modes. This model also explains many puzzling features such as the stimulation of resonant Rayleigh scattering in the backward direction. In addition, the use of nonresonant control beams for coherent control of the polaritons is shown both experimentally and theoretically. The rich complexity of new phenomena in optically excited semiconductor microcavities can be attributed to the distinctive anti-Hermitian or anomalous coupling between polaritons.

  • Received 6 March 2001

DOI:https://doi.org/10.1103/PhysRevB.64.075311

©2001 American Physical Society

Authors & Affiliations

P. G. Savvidis1, C. Ciuti2, J. J. Baumberg1,*, D. M. Whittaker3, M. S. Skolnick4, and J. S. Roberts5

  • 1Department of Physics & Astronomy, University of Southampton, SO17 1BJ, United Kingdom
  • 2Physics Department, Swiss Federal Institute of Technology Lausanne, CH-1015 Lausanne-EPFL, Switzerland
  • 3Toshiba Research Europe Ltd, Cambridge, CB4 4WE, United Kingdom
  • 4Department of Physics, University of Sheffield, Sheffield S3 7RH, United Kingdom
  • 5Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, S1 3JD, United Kingdom

  • *Email address: j.j.baumberg@soton.ac.uk

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Issue

Vol. 64, Iss. 7 — 15 August 2001

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