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Marco Grioni

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Publications associées (109)

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

Recent ARPES experiments on quasi-1D bulk materials and artificial structures

Marco Grioni, Emmanouil Frantzeskakis

The spectroscopy of quasi-one-dimensional (1D) systems has been a subject of strong interest since the first experimental observations of unusual line shapes in the early 1990s. Angle-resolved photoemission (ARPES) measurements performed with increasing ac ...

2008

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

Klaus Kern, Marco Grioni, Daniela Pacilè, Luca Moreschini

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

Near-edge x-ray absorption fine-structure investigation of graphene

Marco Grioni, Daniela Pacilè

We report the near-edge x-ray absorption fine-structure (NEXAFS) spectrum of a single layer of graphite (graphene) obtained by micromechanical cleavage of highly ordered pyrolytic graphite on a SiO2 substrate. We utilized a photoemission electron microscop ...

American Physical Society2008

Local detection of spin-orbit splitting by scanning tunneling spectroscopy

Klaus Kern, Marco Grioni, Daniela Pacilè, Luca Moreschini, Peter Wahl

We demonstrate that the spin-orbit coupling of two-dimensional surface states can be detected locally by scanning-tunneling spectroscopy (STS). The spin splitting of the surface state induces a singularity in the local density of states which can be detect ...

2007

Comparison of bulk-sensitive spectroscopic probes of Yb valence in Kondo systems

Marco Grioni, Luca Moreschini

We exploited complementary synchrotron radiation spectroscopies to study the Yb 4f electronic configuration in three representative intermediate-valence materials: YbAl3, YbInCu4, and YbCu2Si2. High-resolution x-ray absorption (PFY-XAS), resonant inelastic ...

2007

Probing the nature of the Ce 4f states in CeX9Si4 (X=Ni, Co) by high-energy spectroscopies

Marco Grioni, Xiaoqiang Wang, Xiao Wang

2007

The ADRESS project at the Swiss Light Source: A beamline for RIXS and ARPES studies on correlated and nanostructured materials

Marco Grioni, Xiaoqiang Wang, Thorsten Schmitt, Xiao Wang

Elsevier2007

Photoemission and optical studies of ZrSe3, HfSe3, and ZrS3

Helmuth Berger, Marco Grioni, Daniela Pacilè

Angle-resolved photoemission spectroscopy (ARPES) and optical measurements were performed on single crystal samples of ZrSe3, HfSe3, and ZrS3, which belong to the class of low-dimensional band insulators. By ARPES, we traced the dispersion of the (S 3p, Se ...

2007

Giant spin splitting through surface alloying

Klaus Kern, Marco Grioni, Daniela Pacilè, Luca Moreschini

The long-range ordered surface alloy Bi/Ag(111) is found to exhibit a giant spin splitting of its surface electronic structure due to spin-orbit coupling, as is determined by angle-resolved photoelectron spectroscopy. First-principles electronic structure ...

American Physical Society2007

SAXES, a high resolution spectrometer for resonant x-ray emission in the 400-1600 eV energy range

Marco Grioni, Xiaoqiang Wang, Thorsten Schmitt, Xiao Wang

We present a 5 m long spectrometer for soft x rays to be used at a synchrotron radiation beamline for resonant x-ray emission spectroscopy and resonant inelastic x-ray scattering in the 400-1600 eV energy range. It is based on a variable line spacing spher ...

American Institute of Physics2006

Electronic structure of an ordered Pb/Ag(111) surface alloy: Theory and experiment

Marco Grioni, Christian Reinhard Ast, Daniela Pacilè, Luca Moreschini

We have studied by angle-resolved photoelectron spectroscopy (ARPES) the band structure of the ordered surface alloy obtained by the deposition of 0.33 monolayers of Pb on the Ag(111) surface. We observe several dispersing features which are well described ...

2006

Orbital selective overlayer-substrate hybridization in a Pb monolayer on Ag(111)

Thomas Gloor, Harald Brune, Klaus Kern, Marco Grioni, Stephan Fedrigo, Frédéric Mila, Daniela Pacilè

The electronic structure of a Pb overlayer on Ag(111) has been studied by angle-resolved photoemission spectroscopy. We identify three p bands. While the p(xy) bands are sharp and closely resemble the corresponding bands of a free-standing Pb layer, the p( ...

2006

Photoelectron spectroscopy

Marco Grioni

2006

Low-temperature spin-state transition in LaCoO3 investigated using resonant x-ray absorption at the CoK edge

Marco Grioni, Kazimierz Conder

LaCoO3 displays two broad anomalies in the DC magnetic susceptibility chi(DC), occurring, respectively, around 50 K and 500 K. We have investigated the first of them within the 10 K < T < RT temperature range using Co K alpha(1) x-ray absorption spectrosco ...

2006

Understanding mixed valent materials: Effects of dynamical core-hole screening in high-pressure x-ray spectroscopy

Marco Grioni

Changes in the electronic structure of Yb, a material whose valence is modified under pressure, are observed with remarkable detail in x-ray absorption and emission data measured between ambient conditions and 20 GPa. These changes are reproduced by a theo ...

2006

Electronic structure of one-dimensional copper oxide chains in LiCu2O2 from angle-resolved photoemission and optical spectroscopy

Helmuth Berger, Marco Grioni, Daniela Pacilè

Angle-resolved photoemission (ARPES) and optical measurements were performed on single crystal samples of LiCu2O2, an antiferromagnetic S=1/2 spin-chain compound. The ARPES spectra show several dispersive branches associated with hybrid copper-oxygen state ...

2006

Results and perspectives in hard X-ray photoemission spectroscopy (HAXPES) from solids

Marco Grioni

We report on the results obtained during the commissioning phase of the volume photoemission (VOLPE) project, now operational at ESRF. Test experiments were performed on noble metals and highly correlated systems, analyzing photoelectrons with kinetic ener ...

Elsevier2006

Bulk sensitive photoemission: first results of VOLPE project at ESRF

Marco Grioni

We present recent results obtained with a novel spectrometer developed within the EU project VOLPE (VOLume PhotoEmission from solids with synchrotron radiation), now operational at ESRF (Beamline ID 16), where we were able to achieve high energy resolution ...

Elsevier2005

Quantifying the effective attenuation length in high-energy photoemission experiments

Marco Grioni

We have determined the effective attenuation length of photoelectrons over the range of kinetic energies from 4 to 6 keV in Co, Cu, Ge, and Gd2O3. The intensity of the substrate (Si) and overlayer core level peaks was measured as a function of the thicknes ...

2005

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