The quantum theory lab of SPSMS pursues research in nanoelectronics, superconductivity, magnetism, and electronic correlations. We work in close collaboration with experimentalists. People Research Open positions Contact




Contact : Eric Ressouche
The compound URu2Si2 is the object of intense investigations for twenty years because the nature of the phase transition observed at T0 = 17.5 K in this compound still remains a mystery despite an impressive experimental effort. Our polarized neutron diffraction measurements suggest that the ... More »
Modeling strongly correlated systems is a very delicate task. For instance, the theory for the phonon spectrum of uranium has only been available since 2008. Our recent measurements have confirmed this theory and our results combined with new calculations provide an interpretation for the very ... More »
This result is on the front page of Phys. Rev Lett. 107 (13). The article by S. Raymond et al., Understanding the Complex Phase Diagram of Uranium: The Role of Electron-Phonon Coupling, reports on an experimental study coupled to theoretical calculations explaining the phase diagram of uranium, for ... More »
Based on numerical simulations, we have reached a new step in our understanding of the mechanisms that drive the growth of carbon nanotubes.   One of the most commonly used methods for synthesizing carbon nanotubes is chemical vapor deposition (CVD). The reaction involves a liquid ... More »
Contact: Xavier Jehl
We have designed and fabricated the first electron pump using silicon on insulator (SOI) in a standard microelectronics technology. These devices could be used as electrical current standards.   The definition of the ampere in the international system of units is based on the force ... More »
Were you aware that atomic disorder in a metal could result in a quantum transition to an insulating state? Then, what about it when the metal is also a superconductor? Spatially resolved tunneling spectroscopy has revealed the spectral signature of this transition in this paradoxical ... More »
We have just discovered a new spin ice, i.e., a magnetic system with a residual entropy at low temperature.   Statistical physics teaches us that a system’s entropy goes to a finite limit when the temperature approaches absolute zero. This is Nernst's principle, also called the ... More »
Contact : Georgios Katsaros – SPSMS
When two superconductors are connected through a tunnel junction, electron pairs -- the so-called Cooper pairs -- can flow from one to the other. This phenomenon is known as the Josephson effect. We have produced a Josephson quantum dot device in which a single SiGe self-assembled quantum dot is ... More »
Contact: Dai Aoki
It has been known for a couple of years that superconductivity in correlated electron systems can coexist with a ferromagnetic state. Our recent results surprisingly make evident that superconductivity can even be reinforced by a magnetic field, and that this behaviour seems to be generalized in ... More »
In the quest for high critical temperature superconductors (HTCS), a new family of iron-based compounds was discovered in 2008, some of them containing arsenic while others, more recently found, contain selenium or tellurium. Our measurements, performed with a system of this latter type, show a ... More »
Contact: Xavier Jehl
Following the downsizing of microelectronics devices, a large variability in the characteristics of nominally identical transistors is observed. These differences in their behaviour, which are awkward even at ambient temperature, are explained by electronic transport measurements performed at very ... More »
One of the main characteristics of high critical temperature superconductors is the existence of an abnormally small density of electronic states at the Fermi level, in the normal state. We have just witnessed similar behaviour in a conventional, albeit very disordered, ... More »
A neutron resonance spin echo (NRSE) option has recently been installed on the three-axis spectrometer IN22 (CRG at the ILL). This device enables a gain up to two orders of magnitude in terms of energy resolution, and permits precise measurements of dispersive excitation lifetimes.   The ... More »
After more than 20 years of intense research, the nature of the phase which appears below 18 K in the compound URu2Si2 remains a mystery. Until now, no measurement using a microscopic probe has been able to directly link a physical parameter to this phase. We have just shown that this phase is ... More »
Contact: Georgios Katsaros
Starting with a self-assembled SiGe island, we have fabricated a device in which we can precisely control the number of charge carriers. Thanks to the properties of the material in use, this device provides a means to manipulate the spin of the charge carriers in an unprecedented ... More »
Contact : Massimo Mongillo
Using a single silicon nanowire, we have made the first prototype of a multipurpose device which can be used as a field effect transistor, a Schottky diode or a p-n diode. We obtain these functions using electrostatic gates to control the interfaces between the metallic source and drain contacts, ... More »


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