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Post-doctoral position on thermodynamics of quantum information, Institut Néel, Grenoble, France

by Sebastien_Tanzilli - published on , updated on

Institut Néel, Grenoble, France

Nanophysics department, NanoPhysics and SemiConductors CNRS-CEA- Grenoble University joint team, See online: Nanophysics and Semiconductor group


 

- Contact: Maxime Richard

- Project summary

Under resonant optical excitation of a microcavity in the strong coupling regime, a gas of weakly interacting polaritons is excited, that features superfluid properties in Landau’s sense. Indeed, a superfluid critical velocity can be well defined and measured [1], below which disorder- induced elastic scattering within a polariton flow is strongly suppressed [2]. Owing to its photonic nature, dissipative character and spinor degree of freedom, weakly interacting polariton quantum hydrodynamics has been an intense subject of research over the last five years leading to spectacular findings. Ref. [3] provides a comprehensive and up-to-date review on the subject.
In this project our aim is to go beyond “zero”-temperature quantum hydrodynamics of polaritons. Indeed, unlike He II and superconductors featuring complicated acoustic and thermal excitations, polariton superfluids have a “simple” excitation spectrum, in excellent agreement with weakly interacting Bose gas theory. In addition, unlike ultra-cold atom gases, they are intrinsically in “perfect” interface-less contact with a solid-state infinite thermostat. II-VI microcavities constitute a well suited system in this context since owing to their large oscillator strength, the Rabi splitting we are dealing with is larger than kBT at room temperature. The polariton superfluid excitations thus remain confined within the lower polariton branch.
Using optical means, we shall study heat transport properties within a weakly interacting polariton superfluid versus temperature. Coupling with thermal as well as pumped vibrations of the lattice will be investigated.

Keywords: exciton-polaritons, superfluid, Opto-mechanics, semiconductor nanostructures

- Profile of the candidate

The candidate is to carry out optical spectroscopy experiments. He/She will participate actively in the physical analysis and discussions with the theoretists of the team. He/She should display a high level of self-management. He/She should have a solid background in the physics of optical properties of semiconductor nanostructures, and/or ultra-cold atom physics, together with a PhD in experimental optical spectroscopy.

- Salary

Salary scale : from 2000 to 2400 euros net/month, depending on the qualification of the candidate

- Short Bibliography

[1] V. Kohnle et al. Phys. Rev. Lett. 106, 255302 (2011)

[2] A. Amo et al., Nat Phys, 5, 805 (2009)

[3] I. Carusotto and C. Ciuti Rev. Mod. Phys. 85, 299 (2013)

- Details of the position

  • Duration: 16 months with possibility of extension
  • Starting date: ASAP
  • Position funded by the ERC StG “Handy-Q” (Salary 1850€ to 2850€/month depending on past experience)
  • Collaborations : Dr. A. Minguzzi et al. (LPMMC, Grenoble, France), Dr. L. S. Dang, Dr. R. André, Pr. D. Hommel (Bremen University, Germany)