The scientific strategy of our team is to keep alive the double semiconductor culture which exists among its members, namely the one of the sample creator with the sensitivity of material sciences, and the one of the spectroscopist with the sensitivity of solid state physics. It is probably the originality of the team and the secret of its success : by developing a strong synergy between the growth, the technology and the physics of semiconductor nano-objects, various fields which are often only juxtaposed, this group enhances its global efficiency. Besides the main axes which were developed over the last periods, namely the fabrication of nanostructures / microcavities and the studies of related new physical phenomena in quantum optics, opto-electronic, magnetism… the team will be also more connected in the next future to quantum transport measurements and quantum theoretical approaches.This general orientation is illustrated below with the prospectives that we foresee for the different activities.
Besides the 2D heterostructures and the self-assembled quantum dots, the team will continue to develop its know-how for the optimization of bottom-up and top-down nanowires structures, motivated by the issues for spintronics, photonics (quantum optics and opto-electronics), and photovoltaics.
Perform structural and chemical analyses of nanostructures obtained by MBE or MOCVD, to improve the understanding of the growth mechanisms as well as their optical and electro-optical properties.
We use the specific properties of II-VI semiconductors to design and grow nanostructures which behave as model systems, and obtain new functions in the frame of spintronics or quantum manipulation.
We are aiming at creating sources and detectors of light of energy ranging from the THz domain to the deep UV. For this purpose, we benefit from the large variety of materials that are grown within the group. The control of the geometry of the nanostructure allows us to realize devices compatitble with conventionnal lighting applications down to systems which are sensitive to the single photon level.
These approaches, theoretically and experimentally, open a new chapter of quantum optics, not within reach of isolated atoms systems, namely the quantum optics in a solid environment.
Two types of approaches are followed in this field : (i) developing new direct bandgap materials having a high absorption coefficient at the maximum wavelength of the solar spectrum for extremely thin absorber solar cells, and (ii) studying new concepts such as type II band-gap alignment and core/shell structures to optimize photovoltaics conversion