Concept

Liquide de Fermi

Publications associées (243)

High-resolution angle-resolved photoemission investigation of the quasiparticle scattering processes in a model Fermi liquid: 1T-TiTe2

Giorgio Margaritondo, László Forró, Marco Grioni, Richard Gaal, Helmuth Berger, Luca Perfetti

We present a combined angle-resolved photoemission spectroscopy and resistivity study of the model Fermi liquid system 1T-TiTe2. From the analysis of the quasiparticle spectral line shape we identify and separately evaluate the electron-electron. electron- ...

2001

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

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

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

High-resolution photoemission in low-dimensional conductors and superconductors

Giorgio Margaritondo, Marco Grioni

We review some recent spectroscopic results on low-dimensional systems, including high-T-c superconductors, and charge density wave compounds. We briefly discuss the reasons for the present interest in these materials, and the relevance of band mapping exp ...

1999

Remnant fermi surface in the presence of an underlying instability in layered 1T-TaS2

Marco Grioni, Helmuth Berger, Philipp Aebi

We report high resolution angle-scanned photoemission and Fermi surface (FS) mapping experiments on the layered transition-metal dichalcogenide 1T-TaS2 in the quasicommensurate (metallic) and the commensurate (insulating) charge-density-wave (CDW) phase. I ...

American Physical Society1999

Probing hot-electron dynamics at surfaces with a cold scanning tunneling microscope

Klaus Kern, Harald Brune

We report on a novel approach to measure the phase relaxation length and femtosecond lifetime of hot quasiparticles on metal surfaces. A 4 K scanning tunneling microscope has been used to study the spatial decay of interference patterns in the local densit ...

1999

Defect-induced changes in the spectral properties of high-Tc cuprates

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

Superconductivity in high-Tc cuprates is particularly sensitive to disorder due to the unconventional d-wave pairing symmetry. We investigated effects of disorder on the spectral properties of Bi2Sr2CaCu2O8+ ...

1999

Evolution of the quasiparticle spectral function in cuprates

Giorgio Margaritondo, Marco Grioni

We analyzed photoemission data for several doping levels of the Bi2Sr2CaCu2O8+x compounds, ranging from overdoped to underdoped. We show that the high frequency part of the spectra near (0,pi) can be described by Fermi liquid theory in the overdoped regime ...

1998

Experimental electronic structure of a 1D organic metal: TTF-TCNQ

Giorgio Margaritondo, Marco Grioni

We exploited angle-resolved photoelectron spectroscopy (ARPES) with high energy resolution to map the band structure of the typical one-dimensional organic conductor TTF-TCNQ. We directly observe dispersing spectral features corresponding to the donor (TTF ...

1998

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