Research laboratory

Tutelle secondaire CHU Clermont-Ferrand
Membre de Clermont Auvergne INP

N2 - Quantum Optoelectronics and Nanophotonics





Topological photonics

Topology has deepened our understanding of physics and enlarged the spectrum of possibilities. Topological photonics deals mostly with periodic systems with spin-orbit coupling. Topologically non-trivial system exhibit edge states, which are often associated with chiral (one-way) propagation. This is particularly useful for topological optical isolators and topological lasers, protected against reflections.



Quantum fluids of light

Strong light-matter coupling is responsible for the exceptional non-linear interactions of resulting quasi-particles, exciton-polaritons. Their bosonic nature allows observing their Bose condensation. A condensate of polaritons is thus an interacting quantum fluid of light, where many quantum phenomena (superfluidity, quantum vortices, solitons) can be observed at a macroscopic scale.



Analog physics

Different physical systems can be described by the same mathematics. This allows to study one of them to understand the other. This is the goal of analogue physics, including such topics as analogue gravity, early Universe simulations, and others. Even topological photonics can be considered as an example of analogue physics!







Guillaume Malpuech

CNRS Senior Researcher, head of the group

Guillaume's research topics are:
  • strong light-matter coupling;
  • polariton relaxation and lasing;
  • spin-orbit coupling and topology;
  • wide-bandgap materials;
  • analog physics.


Dmitry Solnyshkov

Professeur, HDR, Université Clermont Auvergne, Institut Universitaire de France

Dmitry's research fields:

  • Bose-Einstein condensates of exciton-polaritons: their formation, coherence, statistical and dynamic properties (superfluidity, topological defects), with an applied goal, the manufacture of polariton lasers, interferometers, parametric oscillators, optical transistors, and other non-linear optical components, including for communications and quantum computing;
  • topological systems (topological insulators, chains of dimers) and the associated effects (chiral edge states, spin currents);
  • analog physics: the emulation of inaccessible systems and effects (magnetic monopoles, Klein tunneling effect, formation of topological defects after the Big Bang).


Charly Leblanc

PhD student (2019 - 2022)

Charly focuses on the next topics:

  • topology: quantum metric, topological insulators;
  • polaritonics: strong coupling, Bose-Einstein condensates;
  • integrated photonics: 2D lasers, Moiré superlattices, photonic crystals;
  • non-Hermitian systems: Exceptional (Voigt) points;
  • materials physics: perovskite, TMD, organics;
  • analog physics: rotating black holes, classical chromodynamics.
Charly is currently interested in working in the fields of quantum computing and quantum optoelectronics, both experimentally and theoretically.


Ismaël Septembre

PhD student (2020 - 2023)

Ismaël currently involved in the research of:

  • topological photonics: design of a guided polaritonic topological
    laser at room temperature;
  • analog physics: polaritonic Andreev reflection and topological
    bound states, similarities between analogue black holes and genuine
    black holes;
  • non-hermitian topological physics and exceptional points;
  • Moiré physics.

Pavel Kokhanchik

PhD student (2021-2024)







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Marian Zamfirescu (PhD student 2000-2003)

Fabrice Laussy (PhD student, 2002-2005)

Ivan Shelykh (Post Doc, 2002-2005)

Pierre Bigenwald (Assistant Professor, 2001-2006)

Alexey Kavokin (Professor, 1998-2005)

Henni Ouerdane (Post Doc, 2006-2008)

Robert Johne (PhD student 2006-2009)

Goran Pavlovic (PhD student 2007-2010)

Thomas Weiss (PhD student, 2008-2011)

Hugo Flayac (PhD student, 2009-2012)

Hugo Terças (Post Doc, 2012-2014)

Dmitry Vishnevskii (PhD student, 2010-2013)

Berihu Teklu Gebrehiwot (Post Doc, 2015)

Anton Nalitov (PhD student, 2012-2015)

Olivier Bleu (PhD student, 2015-2018)

Sergei Koniakhin (PhD student, 2017-2020)




Nikolay Gippius (Professor, 2006-2010)





(2001 − 2011)


Kirill Kavokin (Researcher)

Yuri Rubo (Professor)

Sergey Tikhodeev (Professor)

Natalia Maslova (Professor)

Pavlos Lagoudakis (PhD student)

Mikhail Glazov (PhD student)

Nikolai Galkin (PhD student)

Sergey Gavrilov (PhD student)

Valentin Nikolaev (Post Doc)










Our new paper in Physical Review Letters is out!

The work covers the formation of the exciton-polariton condensate in staggered polariton graphene. Both spontaneous or controllable formation of valley-polarized domains occurs with the possibility of creating a chiral current along the domain wall by selecting a single valley.




Our new work was published in Nature Photonics.

We demonstrate a spin-selective strong light-matter coupling regime and as a consequence unusually strong optical nonlinearity in a monolayer MoSe2.




Our new paper was published in Physics Letters A.

The name of the work is "Love might be a second-order phase transition". We say no more, just enjoy the paper!




A new paper was published in Nature Physics.

The work demonstrates the formation of topological gap solitons in a driven-dissipative version of the Su–Schrieffer–Heeger model and discusses their physics.




Our paper was published in Photonics Research (Optica Publishing Group).

We studied photonic graphene created by means of electromagnetically induced transparency. By varying the ratio between the real and imaginary components of the refractive index we managed to control the state of the probe beam exhibiting a hexagonal or honeycomb intensity profile. Finally, we demonstrated the Talbot effect of the transmitted probe patterns.



Our paper was published in the Journal of Applied Physics.

We explored an open-access microcavity enabling tunability of the light-matter coupling strength and found that the lowest condensation threshold always occurs at a fixed depth of energy trap between the exciton reservoir and the polariton ground state. This result fits well with the existing theory of exciton–exciton scattering into the condensate state in the driven-dissipative polaritonic system.



The presentations of group members have been accepted to the PLMCN22 conference which will take place in Varadero, Cuba (10-16 April):

Ismaël Septembre, Annihilation of exceptional points from different Dirac valleys, oral talk;

Charly Leblanc, Universal semiclassical equations based on the quantum metric, poster presentation;

    Update  17/03/2022 Pavel Kokhanchik, Control of SSH chain topology by Rashba-Dresselhaus spin-orbit coupling, poster presentation.  


New preprint on arXiv.

The work is devoted to the theoretical study of exciton-polariton condensation in staggered polariton graphene with the formation of valley-polarized domains following the Kibble-Zurek scenario. The appearance of topologically-protected chiral current at the domain walls was observed.



New preprint on arXiv.

The work discusses the differences between a GaN based ridge polariton laser and a semiconductor edge-emitting laser.



We have updated our website! Now we will regularly publish the latest news, publications, projects, and open positions of our group.




Ismaël Septembre received a young researcher award for his presentation at the international conference OECS17.




paper by our group has been published in Nature.


Sergei Koniakhin successfully defended his PhD thesis.


Ismaël Septembre started his PhD in our group.




An article on Topological Photonics for broad audience has been published by the group in a French journal "Pour la Science".

The publication has also been commented on the radio station "France Culture".









2022 − 2025

NEWAVE (ANR project)

Exploring new operation modes of micro- and nano-lasers for integrated photonics, based on polaritonic quantum fluids of light in GaN waveguides.


2021 − 2025

TopoLight (Horizon 2020 EU Research and Innovation program)

Soft matter platform for optical devices via engineering of non-linear topological states of light.


2020 − 2024

GaNeXT (ANR Labex French project)

The project focuses on the research of element III nitrides (BAlInGaN), wide bandgap semiconductors whose intrinsic properties predispose them for emission in the visible/UV range and use as the electronic components working at high temperature, high frequency, and in harsh environments. GaNeXT combines electronic and photonic approaches for studying these materials.


See older projects...





  We have not updated this section yet. For more information about open positions, feel free to contact Guillaume (This email address is being protected from spambots. You need JavaScript enabled to view it.) and Dmitry (This email address is being protected from spambots. You need JavaScript enabled to view it.) directly.  






Publications can be downloaded as a pdf file via the link (updated 20/01/2022).