Phase diagram of a polariton laser from cryogenic to room temperature

Raphaël Butté, Jacques Levrat, Gabriel Christmann, Eric Feltin, Jean-François Carlin, and Nicolas Grandjean
Phys. Rev. B 80, 233301 – Published 3 December 2009

Abstract

The signature of the strong-coupling regime is unambiguously evidenced in a GaN-based microcavity (MC) above the polariton lasing threshold Pthr at room temperature through the observation of the upper polariton branch. The MC system exhibits a renormalization of the polariton dispersion curve, namely, a reduced normal-mode splitting compared to the low-density regime. Next the dependence of Pthr as a function of exciton-photon detuning is investigated in the 4–340 K temperature range, which allows accessing the polariton lasing phase diagram. The observation of polariton lasing over such a broad range of temperatures reveals a clear transition from a kinetic to a thermodynamic regime with increasing temperature.

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  • Received 29 October 2009

DOI:https://doi.org/10.1103/PhysRevB.80.233301

©2009 American Physical Society

Authors & Affiliations

Raphaël Butté, Jacques Levrat, Gabriel Christmann, Eric Feltin, Jean-François Carlin, and Nicolas Grandjean

  • École Polytechnique Fédérale de Lausanne (EPFL), Institute of Quantum Electronics and Photonics, CH-1015 Lausanne, Switzerland

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Issue

Vol. 80, Iss. 23 — 15 December 2009

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