Concept

Énergie de Fermi

Publications associées (303)

Quasiparticle scattering processes in a model Fermi liquid: 1T-TiTe2

Giorgio Margaritondo, Marco Grioni, Helmuth Berger, Luca Perfetti

We performed angle-resolved photoelectron spectroscopy (ARPES) and resistivity measurements on the layered metal 1T-TiTe2. We determined the quasiparticle dispersion and lifetime. In particular, we could characterize and separately evaluate the effects of ...

2002

The spectroscopic properties of 1D Peierls systems

Giorgio Margaritondo, Marco Grioni, Helmuth Berger, Luca Perfetti

We have studied by high resolution ARPES the spectroscopic properties of the prototype charge density wave system (TaSe4)(2)I and of the closely related insulating compound (NbSe4)(3)I. We observe features dispersing with the lattice periodicity, including ...

2001

On detection of the Fermi edge in in situ grown thin films of high-T-c oxides

Giorgio Margaritondo, Davor Pavuna, Mike Abrecht

We discuss our systematic series of experiments on the photoelectric detection of the Fermi edge using a cylindrical mirror analyser on films of high-T-c oxides. grown in situ by pulsed laser ablation. The Fermi edge (comparable to the edge of the referenc ...

2001

Structural, optical and electronic properties of hydrogenated polymorphous silicon films deposited at 150 degrees C

Raphaël Butté

When silicon thin films are deposited by plasma enhanced chemical vapor deposition in a plasma regime close to the formation of powder, a new type of material, called hydrogenated polymorphous silicon (pm-Si:H) is obtained. This material has increased tran ...

2000

Alternative pseudogap scenario: Spectroscopic analogies between underdoped and disordered Bi2Sr2CaCu2O8+x

Giorgio Margaritondo, László Forró, Marco Grioni, Helmuth Berger

Disorder has a strong influence on the spectral properties of the Bi2Sr2CaCu2O8+x high-T-c superconductor, both in the normal and in the superconducting state. High-resolution photoemission reveals a progressive quasiparticle suppression with increasing di ...

2000

On some common features in high and low-Tc superconducting perovskites

Giorgio Margaritondo, László Forró, Marco Grioni, Davor Pavuna, Helmuth Berger

Recent photoemission evidence for non-zero gap in highly overdoped Bi2Sr2-CaCu2O8+x, along the directions in the Brillouin zone where the d-wave gap exhibits nodes, is in accordance with more conventional behavior in strongly overdoped high-T-c cuprates. T ...

Kluwer Academic / Plenum Publ2000

The spectral properties of quasi-one-dimensional materials: High-resolution ARPES

Marco Grioni

Photoemission investigations of quasi-one dimensional materials reveal the unconventional electronic properties of these systems. The normal state spectra are incompatible with a Fermi liquid description, and exhibit features consistent with the Luttinger ...

2000

Extension of the a-Si:H Electronic Transport Model to the µc-Si:H: Use of the µt Product to Correlate Electronic Transport Properties and Solar Cell Performances

Arvind Shah

The aim of this communication is to show that it is possible to extend the model of the electronic transport developed for amorphous silicon (a-Si:H) to microcrystalline silicon (μc-Si:H). By describing the electronic transport with the μ0τR products (mobi ...

2000

Theory of ultrafast Rayleigh scattering in semiconductor quantum wells

Benoît Marie Joseph Deveaud, Vincenzo Savona

The Rayleigh scattering of light at resonance with the ground state exciton transition in quantum wells is studied by means of a microscopic model. The disorder-induced localization of the exciton center-of-mass leads to characteristic features of the scat ...

2000

Optical signatures of energy-level statistics in a disordered quantum system

Benoît Marie Joseph Deveaud, Vincenzo Savona

Time-resolved measurements of the resonant Rayleigh scattering from quantum well excitons are shown to provide information on the energy-level statistics of the localized exciton states. The signal transients are reproduced by a microscopic quantum model o ...

2000

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