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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
 
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Highlights
02-10-2012
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 »
03-12-2011
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 »
23-09-2011
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 »
04-05-2011
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 »
05-04-2011
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 »
01-02-2011
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 »
15-12-2010
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 »
10-09-2010
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 »
04-05-2010
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 »
03-04-2010
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 »
05-02-2010
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 »
10-11-2009
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 »
10-10-2009
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 »
01-06-2009
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 »
06-04-2009
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 »
03-02-2009
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 »
HAL publications
PhD
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Stages

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Gallery
AN INSULATING SUPERCONDUCTOR
AN INSULATING SUPERCONDUCTOR
Polarized neutron diffraction: a way of investigating the electronic properties of magnetic ions
Polarized neutron diffraction: a way of investigating the electronic properties of magnetic ions
Vortex matter
Unconventional superconductivity
Quantum phase transitions and non Fermi liquid behaviour
CRG instruments at the ILL
CRG instruments at the ILL
CRG instruments at the ILL
CRG instruments at the ILL
Blocage de Coulomb dans des nanofils silicium
Blocage de Coulomb dans des nanofils silicium
Blocage de Coulomb dans des nanofils silicium
People at MDN
Research activities at MDN
Experimental techniques and facilities at MDN
Open positions at MDN
Uranium phase diagram fully understood
URANIUM UNVEILED AT LAST
URANIUM UNVEILED AT LAST
HOW DO NANOTUBES GROW?
ELECTRON PUMPS
DOPING: A SINGULAR CASE
DOPING: A SINGULAR CASE
DOPING: A SINGULAR CASE
ARE NEW SUPERCONDUCTORS TWO-DIMENSIONAL?
RE-ENTRANT SUPERCONDUCTOR FAMILY GETS A NEW MEMBER
RESONANT SUPERCURRENT TRANSISTORS MADE OF SiGe QUANTUM DOTS
TRY SPINEL, THE NEW SPIN ICE CREAM FLAVOUR
INSIGHT INTO THE HIDDEN ORDER OF URU2SI2
INSIGHT INTO THE HIDDEN ORDER OF URU2SI2
INSIGHT INTO THE HIDDEN ORDER OF URU2SI2
INSIGHT INTO THE HIDDEN ORDER OF URU2SI2
WHAT IS HIDDEN BEHIND THE PSEUDO-GAP?
WHAT IS HIDDEN BEHIND THE PSEUDO-GAP?
WHAT IS HIDDEN BEHIND THE PSEUDO-GAP?
THE NEUTRON SPIN DETERMINES THE RESOLUTION
A MULTIPURPOSE DEVICE BASED ON A NANOWIRE
A MULTIPURPOSE DEVICE BASED ON A NANOWIRE
HOLE TRANSPORT THROUGH SINGLE SELF-ASSEMBLED SIGE ISLANDS
HOLE TRANSPORT THROUGH SINGLE SELF-ASSEMBLED SIGE ISLANDS
Hidden order in URu2Si2 unveiled
 

 

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