52 citations · 271 across the 23 of their papers we have counts for
13 papers · 1 filter
Anderson Model out of equilibrium: decoherence effects in transport through a quantum dot
Raphaël Van Roermund, Shiue-yuan Shiau, Mireille Lavagna
The paper deals with the nonequilibrium two-lead Anderson model, considered as an adequate description for transport through a d-c biased quantum dot. Using a self-consistent equat…
Intermediate coupling fixed point study in the overscreened regime of generalized multichannel SU(N) Kondo models
Damien Bensimon, Andres Jerez, Mireille Lavagna
We study a generalized multichannel single-impurity Kondo model, in which the impurity spin is described by a representation of the SU(N) group which combines bosonic and fermionic…
Theoretical analysis of the transmission phase shift of a quantum dot in the presence of Kondo correlations
A. Jerez, P. Vitushinsky, M. Lavagna
We study the effects of Kondo correlations on the transmission phase shift of a quantum dot coupled to two leads in comparison with the experimental determinations made by Aharonov…
Instability of the Fermi-liquid fixed point in an extended Kondo model
M. Lavagna, A. Jerez, D. Bensimon
We study an extended SU(N) single-impurity Kondo model in which the impurity spin is described by a combination of Abrikosov fermions and Schwinger bosons. Our aim is to describe b…
Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gap
P. Korbel, W. Wójcik, A. Klejnberg +3
We supplement (and critically overview) the existing extensive analysis of antiferromagnetic solution for the Hubbard model with a detailed discussion of two specific features, nam…
Transition from a strong-coupling fixed point to an intermediate-coupling fixed point in a single-channel SU(N) Kondo model: role of the filling and two-stage screening
Andres Jerez, Mireille Lavagna, Damien Bensimon
We study an extended SU(N) single-impurity Kondo model in which the impurity spin is described by a combination of Abrikosov fermions and Schwinger bosons. Our aim is to describe b…
Quantum Phase Transitions
M. Lavagna
We give a general introduction to quantum phase transitions in strongly-correlated electron systems. These transitions which occur at zero temperature when a non-thermal parameter…
Critical phenomena near the antiferromagnetic quantum critical point of Heavy-Fermions
M. Lavagna, C. Pépin
We present a study of the critical phenomena around the quantum critical point in heavy-fermion systems. In the framework of the S=1/2 Kondo lattice model, we introduce an extended…
The Kondo Lattice Model
Mireille Lavagna, Catherine Pepin
In this lecture, we review the experimental situation of heavy Fermions with emphasis on the existence of a quantum phase transition (QPT) and related non-Fermi liquid (NFL) effect…
Supersymmetric Approach to Heavy-Fermion Systems
C. Pepin, M. Lavagna
We present a new supersymmetric approach to the Kondo lattice model in order to describe simultaneously the quasiparticle excitations and the low-energy magnetic fluctuations in he…
Spin Dynamics near the Quantum Critical Point of Heavy-Fermions
C. Pepin, M. Lavagna
The dynamical spin susceptibility is studied in the magnetically-disordered phase of heavy-Fermion systems near the antiferromagnetic quantum phase transition. In the framework of…
Dynamic Spin Correlation Function near the Antiferromagnetic Quantum Phase Transition of Heavy-Fermions
C. Pepin, M. Lavagna
The dynamical spin susceptibility is studied in the magnetically-disordered phase of heavy-Fermion systems near the antiferromagnetic quantum phase transition. In the framework of…
Supersymmetry and Theory of Heavy-Fermions
C. Pépin, M. Lavagna
We propose a new approach to the Kondo lattice in order to describe simultaneously the Kondo effect and the local magnetism. This approach relies on an original representation of t…