Concept

Énergie de Fermi

Publications associées (303)

Strain and high temperature superconductivity: Unexpected results from direct electronic structure measurements in thin films

Giorgio Margaritondo, Davor Pavuna, Dominique Cloëtta, Mike Abrecht

Angle-resolved photoemission spectroscopy reveals very surprising strain-induced effects on the electronic band dispersion of epitaxial La2-xSrxCuO4-delta thin films. In strained films we measure a band that crosses the Fermi level (E-F) well before the Br ...

2003

Resonant scattering of X rays as a probe of valence and hybridization in solids

Marco Grioni

With the advent of the very intense 3rd generation synchrotron sources of X rays, new powerful spectroscopic techniques, requiring the detection of very low cross section phenomena, have come of age. Among them Resonant Inelastic X-Ray Scattering (RIXS) is ...

Springer Verlag2003

Ab initio study of interface states at metal contacts to III-IV semiconductors

Thomas Maxisch

We present a theoretical study of the physical characteristics of metal/semiconductor junctions. Using first principle pseudopotential calculations, we have investigated the nature of electronic states with energies within the semiconductor band gap of rep ...

EPFL2003

Photoemission studies of thin films grown by pulsed laser deposition

Mike Abrecht

In this thesis I report on the unique novel possibilities offered by combining pulsed laser deposition (PLD) film growth of high temperature superconductors with angle integrated and angle resolved photoemission spectroscopy (PES and ARPES). The originalit ...

EPFL2003

Effect of the Microstructure on the Electronic Transport in Hydrogenated Microcrystalline Silicon

Arvind Shah, Julien Claude Bailat

Undoped hydrogenated amorphous silicon layers deposited at different values of very high frequency (VHF) powers and silane to hydrogen dilution ratios possess various types of microstructures. Transport and defect measurements on layers suggest that struct ...

2002

Structural phase transition in early growth of Bi2Sr2CaCu2O8+x films on SrTiO3 substrates

Giorgio Margaritondo, Davor Pavuna, Mike Abrecht

We used pulsed laser deposition, with a Bi2Sr2CaCu2O8+x target, to grow films ranging from (1/4) to 10 unit cells thick. We studied these films, and reference Bi2Sr2CaCu2O8+x single crystal samples, using angle-integrated photoemission, core level photoemi ...

2002

Fermi liquid and non-Fermi liquid spectral lineshapes in low-dimensional solids

Marco Grioni, Luca Perfetti

We exploited angle-resolved photoemission (ARPES) to investigate the nature of the elementary quasiparticle (QP) excitations in selected low-dimensional compounds. In the model quasi two-dimensional conductor TiTe2, we observe spectral lineshapes which are ...

Elsevier2002

Systematic studies of (magneto)transport, structural and electronic properties of ultra-thin films of high-T-c cuprates and related layered oxides

Giorgio Margaritondo, Davor Pavuna, Dominique Cloëtta, Mike Abrecht

Properties of ultra-thin films are different from their single crystal counterparts due to the presence of (substrate induced) strain, different degree and type of (growth induced) disorder and different average doping (distribution of oxygen vacancies, fo ...

2002

Electronic properties of high temperature superconducting thin films grown by pulsed laser deposition

Giorgio Margaritondo, Davor Pavuna, Dominique Cloëtta, Mike Abrecht

We use a pulsed laser deposition (PLD) setup to grow ultra-thin films of high temperature superconductors (HTSC) and transfer them in-situ into a photoemission chamber. Photoemission measurements on such films allow us to study noncleavable materials, but ...

Spie-Int Society Optical Engineering2002

Efficient algorithm for band connectivity resolution

Oleg Yazyev

An efficient algorithm for band connectivity (BC) resoln. is presented. The method uses only readily available band coeffs. and the overlap matrix, and has a low computational cost. The accuracy of the BC resoln. is such that the method is practical for me ...

2002

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