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PhD in Condensed matter properties
Organization: Laboratoire Matériaux et Phénomènes Quantiques, Université Denis-Diderot Paris 7
Location: Paris, France
Field: Physics
Requirements:
Master Degree or equivalent in Physics
Abstract:
Our team at the University Paris-Diderot is looking for a highly motivated student for a 3 year Ph. D work in the field of Semiconductor Quantum Optics. The Ph. D project is entitled "Quantum Devices in the Ultra-Strong Coupling Regime".
Description:
The aim of the Ph. D project is to explore quantum devices based on the strong coupling between light and matter, in the THz frequency range, at the frontier between optics and electronics. In such devices, a microcavity photon interacts strongly with an electronic excitation of a highly doped quantum well, to yield new mixed light-matter quasi-particles called “intersubband cavity polaritons”. Our team has been working for several years on opto-electronic devices based on intersubband polaritons, in order to achieve novel efficient light sources in the mid and far-infrared domain [1,2].
The Ph.D student will design and fabricate the photonic cavities suitable for the THz frequency range, on the basis of metal-dielectric-metal structures with extremely sub-wavelength optical confinement. The coupling energies in these systems are of the same order as the transition energy in the quantum well, pushing the system into the so called “ultra-strong coupling” regime. Moreover, as depicted in the figure below, these cavities are ideal to implement for electronic transport parallel to the surface. The polaritonic states can therefore be excited electrically, in a geometry that is very similar to the architecture of a Field Effect Transistor. We therefore expect to observe a modification of the electrical characteristics of the device, arising from the ultra-strong interaction with the photonic mode. Since the features of the light-matter interaction can be controlled by applying a gate voltage, these devices will merge quantum electrodynamics effects and electronic transport.
[1] L. Sapienza et al. Phys. Rev. Lett. 100, 136806 (2008)
[2] Y. Todorov et al., Phys. Rev. Lett. 105, 196402 (2010)
The student will be fully supported through the European Research Council project “ADEQUATE” and will have the opportunity to contribute to high quality research work in a dynamic scientific environment including our newly installed clean room facilities.
Deadline: 01-09-2011
Contacts:
Link: http://www.mpq.univ-paris7.fr/
Email: yanko.todorov@univ-paris-diderot.fr
Phone number: +33 1 57 27 69 90
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