Immunity of intersubband polaritons to inhomogeneous broadening

J-M. Manceau, G. Biasiol, N. L. Tran, I. Carusotto, and R. Colombelli
Phys. Rev. B 96, 235301 – Published 1 December 2017
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Abstract

We demonstrate that intersubband (ISB) polaritons are robust to inhomogeneous effects originating from the presence of multiple quantum wells (MQWs). In a series of samples that exhibit mid-infrared ISB absorption transitions with broadenings varying by a factor of 5 (from 4 to 20 meV), we observed polariton linewidths always lying in the 4 to 7 meV range only. We experimentally verified the dominantly inhomogeneous origin of the broadening of the ISB transition, and that the linewidth reduction effect of the polariton modes persists up to room-temperature. This immunity to inhomogeneous broadening is a direct consequence of the coupling of the large number of ISB oscillators to a single photonic mode. It is a precious tool to gauge the natural linewidth of the ISB plasmon that is otherwise masked in such MQWs system, and is also beneficial in view of perspective applications such as intersubband polariton lasers.

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  • Received 7 July 2017
  • Revised 13 November 2017

DOI:https://doi.org/10.1103/PhysRevB.96.235301

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J-M. Manceau1,*, G. Biasiol2, N. L. Tran1, I. Carusotto3, and R. Colombelli1,†

  • 1Centre de Nanosciences et de Nanotechnologies, CNRS UMR 9001, Université Paris-Sud, Université Paris-Saclay, C2N - Orsay, 91405 Orsay cedex, France
  • 2Laboratorio TASC, CNR-IOM, Area Science Park, S.S. 14 km 163.5 Basovizza, I-34149 Trieste, Italy
  • 3INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, I-38123 Povo, Italy

  • *jean-michel.manceau@u-psud.fr
  • raffaele.colombelli@u-psud.fr

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Issue

Vol. 96, Iss. 23 — 15 December 2017

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