Concept

Effet Hall quantique fractionnaire

Publications associées (121)

Spectroscopy evidences for true Landau Fermi quasiparticles in LSCO

Improving our knowledge of the normal state of high-temperature cuprate superconductors is believed to represent an important, and maybe necessary, step to advance in our understanding of their unconventional superconducting state. In this talk we present ...

2014

Koopmans-compliant functionals and their performance against reference molecular data

Nicola Marzari, Giovanni Borghi, Andrea Ferretti

Koopmans-compliant functionals emerge naturally from extending the constraint of piecewise linearity of the total energy as a function of the number of electrons to each fractional orbital occupation. When applied to approximate density-functional theory, ...

Amer Physical Soc2014

Bridging density-functional and many-body perturbation theory: Orbital-density dependence in electronic-structure functionals

Nicola Marzari, Matteo Cococcioni, Andrea Ferretti

Energy functionals which depend explicitly on orbital densities, rather than on the total charge density, appear when applying self-interaction corrections to density-functional theory; this is, e.g., the case for Perdew-Zunger and Koopmans-compliant funct ...

Amer Physical Soc2014

Pseudopotential formalism for fractional Chern insulators

Ronny Thomale

Recently, generalizations of fractional quantum Hall (FQH) states known as fractional quantum anomalous Hall or, equivalently, fractional Chern insulators states, have been realized in lattice models. Ideal wave functions such as the Laughlin wave function ...

Amer Physical Soc2013

Valley-polarized massive charge carriers in gapped graphene

Klaus Kern, Marko Burghard, Eva Carmen Peters

The lifting of the fourfold degeneracy of the zeroth Landau level in graphene under high magnetic fields has been the subject of numerous experimental studies, and attributed to various mechanisms such as pure spin splitting, spin splitting combined with s ...

Amer Physical Soc2013

Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2−xSrxCuO4

Joël Mesot, Johan Juul Chang, Martin Mansson

High-temperature superconductivity emerges from an un-conventional metallic state. This has stimulated strong efforts to understand exactly how Fermi liquids breakdown and evolve into an un-conventional metal. A fundamental question is how Fermi liquid qua ...

Nature Publishing Group2013

Non-local quasiparticle excitations

Johan Juul Chang

A poster discussion how Landau Fermi-liquid quasiparticles can breakdown in momentum space. ...

2013

Interplay of Dirac fermions and heavy quasiparticles in solids

Thorsten Schmitt

Many-body interactions in crystalline solids can be conveniently described in terms of quasiparticles with strongly renormalized masses as compared with those of non-interacting particles. Examples of extreme mass renormalization are on the one hand graphe ...

Nature Publishing Group2013

Hartree simulations of coupled quantum Hall edge states in corner-overgrown heterostructures

The electronic states in a corner-overgrown bent GaAs/AlGaAs quantum well heterostructure are studied with numerical Hartree simulations. Transmission electron microscope pictures of the junction sharpness are shown to justify the sharp-corner potential as ...

American Physical Society2013

Controlling edge states in the Kane-Mele model via edge chirality

Oleg Yazyev, Gabriel Albert Autes

We investigate the dependence of band dispersion of the quantum spin Hall effect (QSHE) edge states in the Kane-Mele model on crystallographic orientation of the edges. Band structures of the one-dimensional honeycomb lattice ribbons show the presence of t ...

Wiley-V C H Verlag Gmbh2013

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