Concept

Strongly correlated material

Publications associées (370)

Magnetism and superconductivity of strongly correlated electrons on the triangular lattice

Frédéric Mila, Cédric Weber, Thierry Giamarchi

We investigate the phase diagram of the t−J model on a triangular lattice using a variational Monte Carlo approach. We use an extended set of Gutzwiller projected fermionic trial wave functions allowing for simultaneous magnetic and superconducting order p ...

2006

Spectroscopie en espace réciproque de polaritons confinés dans une microcavité semiconductrice

Reda Idrissi Kaitouni

Polaritons are hybrid quasi-particles made of photons and excitons. They represent the fundamental electronic excitations of an insulator interacting with the electromagnetic field. In planar semiconductor microcavities, polaritons are confined along one s ...

EPFL2006

Multiple description coding with redundant expansions and application to image communication

Pascal Frossard, Ivana Radulovic

Multiple description coding offers an elegant and competitive solution for data transmission over lossy packetbased networks, with a graceful degradation in quality as losses increase. On the other hand, coding techniques based on redundant transforms give ...

2006

Inward thermodiffusive particle pinch in electron internal transport barriers in TCV

Olivier Sauter, Stefano Coda, Timothy Goodman, Henri Weisen, Emiliano Fable, Costanza Zucca

Electron internal transport barriers (eITBs) are obtained in TCV with different heating and current drive schemes. They are sustained in steady-state conditions for several energy confinement and current redistribution times. In these scenarios, the densit ...

2006

Scaling of density peaking in JET H-modes and implications for ITER

Henri Weisen, Mikhail Maslov

Results from an extensive profile database analysis of JET density profiles in H-mode show that the density peaking factor n(e0)/ < n(e) > in JET H-modes increases as the effective collisionality v(eff) congruent to 10(-14) RZ(eff)n(e)/T-e(2) drops from si ...

2006

Mott phase at the surface of 1T-TaSe2 observed by scanning tunneling microscopy

Marco Grioni, Helmuth Berger, Luca Perfetti

In this Letter we report the observation, by scanning tunneling microscopy, of a Mott metal to insulator transition at the surface of 1T-TaSe2. Our spectroscopic data compare considerably well with previous angle-resolved photoemission spectroscopy measure ...

American Physical Society2005

Unexpected periodicity in the quasi-two-dimensional Mott insulator 1T-TaS2 revealed by angle-resolved photoemission

Frédéric Mila, Marco Grioni, Helmuth Berger, Thomas Gloor, Luca Perfetti

High-resolution angle-resolved photoemission data from the insulating phase of the charge-density-wave (CDW) material 1T-TaS2 reveal the backfolding of the electronic bands associated with the CDW superlattice, but also an additional, unexpected periodicit ...

2005

Study of novel electronic conductors

Neven Barisic

This thesis presents the results of a concerted effort to understand the complex array of physical properties exhibited by the BaVS3 family of materials. As a 3d1 system, BaVS3 displays a unique collection of correlation-driven phenomena, including a metal ...

EPFL2005

Electronic properties of carbon nanotubes

Thomas Gloor

In this thesis we study the interplay between electronic correlations and geometry in single-walled carbon nanotubes by microscopic model calculations. Electronic correlations are expected to be strong because of the low dimensionality of carbon nanotubes. ...

EPFL2005

Charge ordering, stripes and phase separation in manganese perovskite oxides: An STM/STS study

Henrik Moodysson Rønnow

A microscopic characterisation of the phase transitions associated with colossal magnetoresistance (CMR) in manganese perovskite oxides is a very important ingredient in the quest of understanding its underlying mechanism. Scanning tunneling microscopy (ST ...

2005

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