26/03/2020
The Human Resources Strategy for Researchers

PhD contract in the field of Physics financed by the University Clermont Auvergne

This job offer has expired


  • ORGANISATION/COMPANY
    Université Clermont Auvergne
  • RESEARCH FIELD
    Physics
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    21/05/2020 23:00 - Europe/Brussels
  • LOCATION
    France › AUBIERE
  • TYPE OF CONTRACT
    Other
  • JOB STATUS
    Other
  • HOURS PER WEEK
    35 H
  • OFFER STARTING DATE
    01/10/2020
  • REFERENCE NUMBER
    UCA/SF/0016
  • IS THE JOB RELATED TO STAFF POSITION WITHIN A RESEARCH INFRASTRUCTURE?
    Yes

Title of the thesis: Mott transition in anisotropic polaritonic guides based on zinc

oxide

Supervisor: Pr. Joël LEYMARIE

Laboratory: Institut Pascal UMR 6602 UCA/CNRS/SIGMA

University: Université Clermont Auvergne (UCA)

Email and Phone : joel.leymarie@uca.fr, + 33 (4) 73 40 70 26

Co-supervisor: François MEDARD

Laboratory: Institut Pascal UMR 6602 UCA/CNRS/SIGMA

University: Université Clermont Auvergne (UCA)

Summary:

The most effective way to control the propagation of the light is to made photons interact with

elementary excitations of condensed matter called excitons. An exciton is an electron and a

hole attracted to each other by the electrostatic Coulomb force. The light energy is thus

propagating as polaritons, quasi-particle resulting from the strong light-matter coupling.

Polaritons are composite bosons that may condensate and lead to physical phenomena such

as the stimulated emission, the superfluidity or the propagation of protected states in

topological insulators. Potential applications are considered for optoelectronics: lasers with a

low threshold, optical transistors or insulators.

This thesis is developed in the prospect of producing polaritonic circuits that will benefit from

the intrinsic properties of polaritons in ZnO waveguides. Following this goal, it is essential to

determine a domain of existence for polaritons as a function of temperature and free carriers

density. As a matter of fact, above a certain concentration of carrier, the Coulomb interaction

is screened and excitons are replaced by a free electrons and holes plasma: this is called the

Mott transition. Studying the propagation of polaritons in ZnO waveguides will allow to

analyze their dispersion relation as a function of the optical excitation power and

temperature. It will be possible to determine the phase diagram of the system made up of

excitons and the electron-hole plasma. The polaritonic dispersion relation is experimentally

measured thanks to a grating etched on the sample surface. The study will be combined with

time-resolved photoluminescence to determine the carriers lifetime and thus the precise

carrier density.

Another part of this thesis will focus on the analysis of anisotropy in the waveguide. ZnO is

an anisotropic semiconductor which conducts to singularities on the propagation of light. The

experiments described above are expected to reveal specific behaviors such as a mixing

between TE and TM modes. A numerical code has been developed by the team to determine

the propagating modes in waveguides. The student will use and modify this code during the

thesis.

 

More informations via the link :

https://sf.ed.uca.fr/financement-doctoral/contrat-doctoral-allocations-ministerielles/sujets-de-these-ed-sf-2020-proposes-au-concours/

 

 

To apply, please download the application file via the link :

https://sf.ed.uca.fr/financement-doctoral/contrat-doctoral-allocations-m...

 
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Benefits

 

 
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Eligibility criteria

 
 
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Selection process

Interested students must send two copies of their application to the secretariat of the doctoral school before 22 May 2020, the deadline.

Audition at the doctoral school of the selected candidates:

- 4 June morning: LAMP jury

- 11th June morning: LMV jury

- 11 June afternoon: Chemistry jury

- 12 June: Physics jury

19 June: ED SF council for allocations Doctoral allocations

 
 
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Additional comments

 
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Offer Requirements

  • REQUIRED EDUCATION LEVEL
    Physics: Master Degree or equivalent

Skills/Qualifications

 
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Specific Requirements

Speak French or very good level of English

 
 
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Map Information

Job Work Location Personal Assistance locations
Work location(s)
1 position(s) available at
Pascal Institute (IP)
France
Région Auvergne Rhône-Alpes
AUBIERE
63178
Campus Universitaire des Cézeaux TSA 60026 CS 60026 4, Avenue Blaise Pascal

Open, Transparent, Merit based Recruitment procedures of Researchers (OTM-R)

Know more about it at Université Clermont Auvergne

Know more about OTM-R

EURAXESS offer ID: 508402

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