Thesis, internship, and post-doc opportunities
2282 results found
[Thesis]
Thermoelectricity superconducting and ferromagnetic in compounds
Offer N°: 14033
One of the goals of modern physics is to couple the magnetic and electronic properties in order to develop a new class of correlated materials such as high temperature superconductors, colossal magnetoresistance materials, multiferroic materials or heavy fermion materials. It therefore appears essential to study this type of material to better understand the interaction between the quantum fluctuations associated with electronic and magnetic degree of freedom.
One of the goals of modern physics is to couple the magnetic and electronic properties in order to develop a new class of correlated materials such as high temperature superconductors, colossal magnetoresistance materials, multiferroic materials or heavy fermion materials. It therefore appears essential to study this type of material to better understand the interaction between the quantum fluctuations associated with electronic and magnetic degree of freedom. Heavy fermions present in addition to the conventional Fermi liquid, a variety of ground states (superconductivity, magnetic orders, hidden orders) which are especially sensitive to magnetic field or pressure (hydrostatic / uniaxial). The diversity of ground states and the importance of the effective mass in these materials result from the presence of f electrons bands. Among these materials we will focus particularly on UCoGe and URhGe compounds that present a coexistence of ferromagnetic and superconducting states at low temperature whose origin is still debated. Thus, the proposed thesis includes two aspects: (i) Precise thermoelectric measurements at different orientations of the magnetic field supplemented by susceptibility measurements, thermal conductivity and specific heat to explore in detail the peculiar curvature of the upper critical field in a ferromagnetic superconductor.(ii) Important instrumental development to achieve a thermoelectric device operating under uniaxial pressure and low temperature.
[Thesis]
Thermoelectricity superconducting and ferromagnetic in compounds
Offer N°: 14033
One of the goals of modern physics is to couple the magnetic and electronic properties in order to develop a new class of correlated materials such as high temperature superconductors, colossal magnetoresistance materials, multiferroic materials or heavy fermion materials. It therefore appears essential to study this type of material to better understand the interaction between the quantum fluctuations associated with electronic and magnetic degree of freedom.
One of the goals of modern physics is to couple the magnetic and electronic properties in order to develop a new class of correlated materials such as high temperature superconductors, colossal magnetoresistance materials, multiferroic materials or heavy fermion materials. It therefore appears essential to study this type of material to better understand the interaction between the quantum fluctuations associated with electronic and magnetic degree of freedom. Heavy fermions present in addition to the conventional Fermi liquid, a variety of ground states (superconductivity, magnetic orders, hidden orders) which are especially sensitive to magnetic field or pressure (hydrostatic / uniaxial). The diversity of ground states and the importance of the effective mass in these materials result from the presence of f electrons bands. Among these materials we will focus particularly on UCoGe and URhGe compounds that present a coexistence of ferromagnetic and superconducting states at low temperature whose origin is still debated. Thus, the proposed thesis includes two aspects: (i) Precise thermoelectric measurements at different orientations of the magnetic field supplemented by susceptibility measurements, thermal conductivity and specific heat to explore in detail the peculiar curvature of the upper critical field in a ferromagnetic superconductor.(ii) Important instrumental development to achieve a thermoelectric device operating under uniaxial pressure and low temperature.
[Thesis]
Tunnelling spectroscopy at very low temperature on superconducting graphene
Offer N°: 14031
Graphene, a monolayer of carbon atoms organized on a honeycomb lattice, displays outstanding electronic properties due to a linear dispersion of its electronic states close to the Fermi level. The charge carriers, either electrons or holes depending on the electro-chemical potential, are relativistic and can propagate ballistically. We grew graphene on top of Rhenium, a superconducting metal. Graphene becomes thus superconducting by proximity effect.
Graphene, a monolayer of carbon atoms organized on a honeycomb lattice, displays outstanding electronic properties due to a linear dispersion of its electronic states close to the Fermi level. The charge carriers, either electrons or holes depending on the electro-chemical potential, are relativistic and can propagate ballistically. We grew graphene on top of Rhenium, a superconducting metal. Graphene becomes thus superconducting by proximity effect. The PhD project consists in making hybrid nanostructures (Andreev Billiard) based on this system and in studying it with the help of a scanning tunnelling microscope (STM) cooled at very low temperature (50 mK). The student will seek for ballistic signatures of the electrons in these superconducting graphene-based nanostructures in the maps of the electronic density of states acquired with the STM.
[Thesis]
Tunnelling spectroscopy at very low temperature on superconducting graphene
Offer N°: 14031
Graphene, a monolayer of carbon atoms organized on a honeycomb lattice, displays outstanding electronic properties due to a linear dispersion of its electronic states close to the Fermi level. The charge carriers, either electrons or holes depending on the electro-chemical potential, are relativistic and can propagate ballistically. We grew graphene on top of Rhenium, a superconducting metal. Graphene becomes thus superconducting by proximity effect.
Graphene, a monolayer of carbon atoms organized on a honeycomb lattice, displays outstanding electronic properties due to a linear dispersion of its electronic states close to the Fermi level. The charge carriers, either electrons or holes depending on the electro-chemical potential, are relativistic and can propagate ballistically. We grew graphene on top of Rhenium, a superconducting metal. Graphene becomes thus superconducting by proximity effect. The PhD project consists in making hybrid nanostructures (Andreev Billiard) based on this system and in studying it with the help of a scanning tunnelling microscope (STM) cooled at very low temperature (50 mK). The student will seek for ballistic signatures of the electrons in these superconducting graphene-based nanostructures in the maps of the electronic density of states acquired with the STM.
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