Concept

Liquide de Fermi

Publications associées (243)

Spin-orbit split two-dimensional electron gas with tunable Rashba and Fermi energy

Klaus Kern, Marco Grioni, Luca Moreschini, Daniela Pacilè

We demonstrate that it is possible to tune the Rashba energy, introduced by a strong spin-orbit splitting, and the Fermi energy in a two-dimensional electron gas by a controlled change of stoichiometry in an artificial surface alloy. In the BixPb1-x/Ag(111 ...

2008

Tunable Spin Gaps in a Quantum-Confined Geometry

Marco Grioni, Emmanouil Frantzeskakis

We have studied the interplay of a giant spin-orbit splitting and of quantum confinement in artificial Bi-Ag-Si trilayer structures. Angle-resolved photoelectron spectroscopy reveals the formation of a complex spin-dependent gap structure, which can be tun ...

American Physical Society2008

Electron-phonon interaction and charge carrier mass enhancement in SrTiO3

Claudio Grimaldi, Dirk Van der Marel

We report a comprehensive THz, infrared and optical study of Nb-doped SrTiO3 as well as dc conductivity and Hall effect measurements. Our THz spectra at 7 K show the presence of an unusually narrow (< 2 meV) Drude peak. For all carrier concentrations the D ...

2008

Resonant spectroscopy on strongly correlated materials

Xiaoqiang Wang

All strongly correlated materials exhibit fascinating physical properties, like Mott insulator transitions, high temperature superconductivity, Kondo and heavy fermion behavior, colossal magnetoresistance, etc. These properties make them attractive for dev ...

EPFL2008

Generalized Elliott-Yafet Theory of Electron Spin Relaxation in Metals: Origin of the Anomalous Electron Spin Lifetime in MgB2

László Forró, Slaven Garaj

The temperature dependence of the electron-spin relaxation time in MgB2 is anomalous as it does not follow the resistivity above 150 K; it has a maximum around 400 K and decreases for higher temperatures. This violates the well established Elliot-Yafet the ...

2008

Kinks in the angle resolved photoemission and inelastic x-ray spectra of high temperature superconductors

Jeff Graf

Though the high superconducting transition temperature (Tc) is the most interesting technological aspect of high temperature superconductors, the complex way in which the spin, lattice and electronic degrees of freedom interplay, makes them of the highest ...

EPFL2008

Direct angle resolved photoelectron spectroscopy (DARPES) on high-Tc films: doping, strains, Fermi surface topology and superconductivity - art. no. 012040

Davor Pavuna, Dominique Cloëtta, Claudia Cancellieri, Mike Abrecht

Since 1997 we systematically perform Direct ARPES (=DARPES) on in-situ grown, non-cleaved, ultra-thin (

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England2008

Emergent fermions and anyons in the Kitaev model

We study the gapped phase of the Kitaev model on the honeycomb lattice using perturbative continuous unitary transformations. The effective low-energy Hamiltonian is found to be an extended toric code with interacting anyons. High-energy excitations are em ...

2008

Resonating-valence-bond approaches to high-temperature superconductivity

Samuel Bieri

This thesis is devoted to a theoretical study of high-temperature superconductivity from the viewpoint of a doped Mott insulator. To this end, the square-lattice t-J model is analyzed by variational and mean-field approaches. The thesis focuses on the cons ...

EPFL2008

Direct angle resolved photoemission spectroscopy and superconductivity of strained high-T-c films

Davor Pavuna, Dominique Cloëtta, Claudia Cancellieri, Mike Abrecht

Since 1997 we systematically perform direct angle resolved photoemission spectroscopy (ARPES) on in-situ grown thin (

2008

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