Our research team is mainly interested in studying wide band-gap semiconductor nanostructures by femtosecond laser spectroscopy. Different aspects of the electron relaxation dynamics are accessible in experiments using ultra-short laser light pulses:
The electron-spin dynamics may be tested taking advantage of the particular structure of electron states, which posses a well-defined total angular momentum or “pseudo-spin”. The selection rules of the optical transitions allow to inject carriers with a controlled spin into the samples and to follow their relaxation by using polarized light beams. The study of the spin evolution of charged carriers in semiconductors is motivated by the possibility to associate (in the same device) the electron spin for stocking of information and its charge for transportation of this information. The spin evolution of the charged carriers in a semiconductor is not only determined by the life time of a spin state but also by the coherent superposition of the different spin states and the time during which such a superposition may be maintained. We measure [1] the coherence time and the lifetime of spin states of electrons, holes, or of excitons in semiconductor nanostructures, such as quantum wells or quantum points of different compounds (GaAs, CdTe, CuCl, GaN). We develop for these studies experimental techniques of femtosecond spectroscopy as pump-probe and four-wave mixing, which are specific for the determination of the spin evolution.
The geometry and the reduced dimensionality of the semiconductor nanostructures modify significantly the electron states and the processes, which govern their relaxation dynamics. Our earlier studies have allowed us to evidence the important role that plays the coupling between carriers and phonons in quantum wells containing quantum dots of CdZnTe. Actually, we examine the intra-band relaxation of electrons by optical-phonon emission on an ultra-short time scale (<100fs) .
Today electronics is almost totally based on Silicon, but its optical properties are quite mediocre. To build silicon nanostructures in form of porous networks or of nanocrystals allows obtaining emission proprieties in the visible, which are particularly interesting for applications in optoelectronics. We are interested in optical amplification processes in silicon nanocrystals and measure in particular their gain. The final aim is to obtain an efficient material for the fabrication of laser sources, integrated into the electronic device .
Our spectroscopic equipment for low temperature research allows us to characterize the optical properties of various materials that are developed at the IPCMS. In collaboration with the DCMI we are interested in bi-functional lamellar compounds, in which the emission properties of the organic material are associated to the magnetic properties of films of nickel or cobalt. We also study the photoluminescence of nanocrystals of titanium oxide (TiO2) because of their photo-catalytic properties. We have in particular shown that a decrease of the light emission intensity is correlated with temperature and the reactivity of the particles.
Team Members :
Publications :
1839302
HVHG5Z72
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surface-science-reports
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A. Girault, M. Gallart, M. Ziegler, O. Crégut, M. Balestrieri, I. Gozhyk, H. Montigaud, D. Sciacca, L. Mancini, P. Gilliot, Photocarrier dynamics in anatase TiO2: Evidence of thermally activated collisions between carriers, Physical Review B 108 (2023) 155204. https://doi.org/10.1103/PhysRevB.108.155204.
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M. Gallart, M. Ziegler, O. Crégut, E. Feltin, J.-F. Carlin, R. Butte, N. Grandjean, B. Hönerlage, P. Gilliot, Determining the nature of excitonic dephasing in high-quality GaN/AlGaN quantum wells through time-resolved and spectrally resolved four-wave mixing spectroscopy, Physical Review B 96 (2017) 041303(R). https://doi.org/10.1103/PhysRevB.96.041303.
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M. Gallart, T. Cottineau, B. Hönerlage, V. Keller, N. Keller, P. Gilliot, Temperature dependent photoluminescence of anatase and rutile TiO2 single crystals: Polaron and self-trapped exciton formation, Journal of Applied Physics 124 (2018) 133104. https://doi.org/10.1063/1.5043144.
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M. Gallart, M. Ziegler, B. Hönerlage, P. Gilliot, E. Feltin, J.-F. Carlin, R. Butte, N. Grandjean, Phase and spin relaxation dynamics in high-quality single GaN/AlGaN quantum well, in: Bigot, JY and Hubner, W and Rasing, T and Chantrell, R (Ed.), Ultrafast Magnetism I, SPRINGER INT PUBLISHING AG, Strasbourg, France, 2015: pp. 14–15. https://doi.org/10.1007/978-3-319-07743-7_5.
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F. Federspiel, G. Froehlicher, M. Nasilowski, S. Pedetti, A. Mahmood, B. Doudin, S. Park, J.-O. Lee, D. Halley, B. Dubertret, P. Gilliot, S. Berciaud, Distance Dependence of the Energy Transfer Rate from a Single Semiconductor Nanostructure to Graphene, Nano Letters 15 (2015) 1252–1258. https://doi.org/10.1021/nl5044192.
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P. Farger, C. Leuvrey, M. Gallart, P. Gilliot, G. Rogez, J. Rocha, D. Ananias, P. Rabu, E. Delahaye, Magnetic and luminescent coordination networks based on imidazolium salts and lanthanides for sensitive ratiometric thermometry, Beilstein Journal of Nanotechnology 9 (2018) 2775–2787. https://doi.org/10.3762/bjnano.9.259.
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P. Farger, C. Leuvrey, M. Gallart, P. Gilliot, G. Rogez, P. Rabu, E. Delahaye, Elaboration of Luminescent and Magnetic Hybrid Networks Based on Lanthanide Ions and Imidazolium Dicarboxylate Salts: Influence of the Synthesis Conditions, Magnetochemistry 3 (2017) 1. https://doi.org/10.3390/magnetochemistry3010001.
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P. Farger, R. Guillot, F. Leroux, N. Parizel, M. Gallart, P. Gilliot, G. Rogez, E. Delahaye, P. Rabu, Imidazolium Dicarboxylate Based Metal-Organic Frameworks Obtained by Solvo-Ionothermal Reaction, European Journal of Inorganic Chemistry (2015) 5342–5350. https://doi.org/10.1002/ejic.201500825.
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Q. Evrard, Z. Chaker, M. Roger, C.M. Sevrain, E. Delahaye, M. Gallart, P. Gilliot, C. Leuvrey, J.-M. Rueff, P. Rabu, C. Massobrio, M. Boero, A. Pautrat, P.-A. Jaffrès, G. Ori, G. Rogez, Layered Simple Hydroxides Functionalized by Fluorene-Phosphonic Acids: Synthesis, Interface Theoretical Insights, and Magnetoelectric Effect, Advanced Functional Materials 27 (2017) 1703576. https://doi.org/10.1002/adfm.201703576.
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Y. Cai, D. Begin, C. Sidhoum, A. Girault, T. Fix, C. Lefèvre, W. Belayachi, A. Dinia, D. Preziosi, M. Gallart, P. Gilliot, E. Gros-Daillon, F. Ledee, O. Ersen, C. Sanchez, S. Bégin-Colin, Mechanosynthesis of MAPbI3@Graphite Composites with Active Interfaces and Promising Photodetection Properties, Chem. Mater. 35 (2023) 10188–10205. https://doi.org/10.1021/acs.chemmater.3c02418.
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A.K. Bharwal, J.P. Briggs, C. Tamin, M. Hanauer, M. Lenertz, J. Bartringer, S. Roques, C. Chevalier, M. Gallart, P. Gilliot, M. Ziegler, A. Dinia, A. Slaoui, R.T. Collins, T. Fix, Enhanced Optoelectronic Properties of Silicon Clathrate Films via Sodium Extraction by Vacuum Annealing, Physica Status Solidi-Rapid Research Letters 19 (2025) e202500318. https://doi.org/10.1002/pssr.202500318.
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N. Benamara, M. Diop, C. Leuvrey, M. Lenertz, P. Gilliot, M. Gallart, H. Bolvin, F. Setifi, G. Rogez, P. Rabu, E. Delahaye, Octahedral Hexachloro Environment of Dy3+ with Slow Magnetic Relaxation and Luminescent Properties, European Journal of Inorganic Chemistry (2021) 2099–2107. https://doi.org/10.1002/ejic.202100143.
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L. Beaur, T. Bretagnon, T. Guillet, C. Brimont, M. Gallart, B. Gil, P. Gilliot, C. Morhain, Phonon-assisted exciton formation in ZnO/(Zn, Mg)O single quantum wells grown on C-plane oriented substrates, Journal of Luminescence 136 (2013) 355–357. https://doi.org/10.1016/j.jlumin.2012.11.010.
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M. Balestrieri, S. Colis, M. Gallart, G. Schmerber, P. Bazylewski, G.S. Chang, M. Ziegler, P. Gilliot, A. Slaoui, A. Dinia, Photon management properties of rare-earth (Nd,Yb,Sm)-doped CeO2 films prepared by pulsed laser deposition, Physical Chemistry Chemical Physics 18 (2016) 2527–2534. https://doi.org/10.1039/C5CP04961J.
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M. Balestrieri, S. Colis, M. Gallart, G. Schmerber, M. Ziegler, P. Gilliot, A. Dinia, Photoluminescence properties of rare earth (Nd, Yb, Sm, Pr)-doped CeO2 pellets prepared by solid-state reaction, Journal of Materials Chemistry C 3 (2015) 7014–7021. https://doi.org/10.1039/c5tc00075k.
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M. Balestrieri, S. Colis, M. Gallart, G. Ferblantier, D. Muller, P. Gilliot, P. Bazylewski, G.S. Chang, A. Slaoui, A. Dinia, Efficient energy transfer from ZnO to Nd3+ ions in Nd-doped ZnO films deposited by magnetron reactive sputtering, Journal of Materials Chemistry C 2 (2014) 9182–9188. https://doi.org/10.1039/c4tc00980k.
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M. Balestrieri, M. Gallart, M. Ziegler, P. Bazylewski, G. Ferblantier, G. Schmerber, G.S. Chang, P. Gilliot, D. Muller, A. Slaoui, S. Colis, A. Dinia, Luminescent Properties and Energy Transfer in Pr3+ Doped and Pr3+-Yb3+ Co-doped ZnO Thin Films, Journal of Physical Chemistry C 118 (2014) 13775–13780. https://doi.org/10.1021/jp502311z.
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B. Azeredo, A. Carton, C. Leuvrey, C. Kiefer, D. Ihawakrim, S. Zafairatos, M. Gallart, P. Gilliot, B.P. Pichon, Synergistic photo optical and magnetic properties of a hybrid nanocomposite consisting of a zinc oxide nanorod array decorated with iron oxide nanoparticles, Journal of Materials Chemistry C 6 (2018) 10502–10512. https://doi.org/10.1039/c8tc02680g.