Concept

Orbiton

Related publications (49)

Diffractive elements designed to suppress unwanted zeroth order due to surface depth error

We consider a design approach to reduce unwanted zero-order intensity due to profile depth error in diffractive elements. Our method is based on addition of local bias phase to a binary element phase, leading to the introduction of a third phase level. We ...

2004

Enhanced resonant backscattering of excitons in disordered quantum wells

Vincenzo Savona

A clear signature of enhanced backscattering of excitons is observed in the directional resonant Rayleigh scattering of light from localized two-dimensional excitons in disordered quantum wells. Its spectral dependence and time dynamics are measured and th ...

2002

Digital reflection-type phase shifter based on a ferroelectric planar capacitor

Nava Setter, Alexander Tagantsev, Konstantin Astafiev

Novel design of an integrated digital refelction-type phase shifter based on a Barium Strontium Titanate thin-film capacitor is presented. Measured characteristics of the phase shifter am compared with the theoretically predicted ones. ...

2001

Bounded Luttinger liquids as a universality class of quantum critical behavior

Marco Grioni

We show that one-dimensional quantum systems with gapless degrees of freedom and open boundary conditions form a universality class of quantum critical behavior, which we propose to call ''bounded Luttinger liquids." They share the following properties wit ...

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

Band mapping and quasiparticle suppression in the one-dimensional organic conductor TTF-TCNQ

Giorgio Margaritondo, Marco Grioni

Dispersing 1D bands have been observed for the first time in an organic conductor by high resolution photoemission experiments on TTF-TCNQ (tetrathiafulvalene-tetracyanoquinodimethane). Their properties are extremely unusual: the bandwidth is much larger t ...

1998

Doping effects on the electronic structure of CuO2 planes

Giorgio Margaritondo, Marco Grioni, Helmuth Berger

We have exploited angle-resolved photoelectron spectroscopy to study changes in the quasiparticle excitations of CuO2 planes as a function of the carrier density, in optimally doped and underdoped Bi2Sr2CaCuO8+x and in Sr2CuO2Cl2. We have observed large ch ...

1997

Progress in understanding VUV photoemission in low-dimensionality systems

Giorgio Margaritondo, Helmuth Berger

High-resolution angle-resolved photoemission and core-level photoemission measurements were performed on single crystal samples of the quasi-one-dimensional material (TaSe4)(2)I and the cuprate superconductor Bi2Sr2CaCu2O8+x. Resistivity measurements were ...

1996

Ultrafast Dynamics of Intersubband Relaxation in Gaas Quantum-Wells - Hot-Carrier and Phonon Populations Effects

Benoît Marie Joseph Deveaud

The dynamics of intersubband relaxation in GaAs quantum wells and the role of hot carriers and the phonon distributions have been investigated using two different optical techniques with femtosecond resolution: 1) time-resolved photoluminescence and 2) pum ...

1994

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