27 research outputs found
Interaction quench and thermalization in a one-dimensional topological Kondo insulator
We study the nonequilibrium dynamics of a one-dimensional topological Kondo
insulator, modelled by a -wave Anderson lattice model, following a quantum
quench of the on-site interaction strength. Our goal is to examine how the
quench influences the topological properties of the system, therefore our main
focus is the time evolution of the string order parameter, entanglement
spectrum and the topologically-protected edge states. We point out that
postquench local observables can be well captured by a thermal ensemble up to a
certain interaction strength. Our results demonstrate that the topological
properties after the interaction quench are preserved. Though the absolute
value of the string order parameter decays in time, the analysis of the
entanglement spectrum, Loschmidt echo and the edge states indicates the
robustness of the topological properties in the time-evolved state. These
predictions could be directly tested in state-of-the-art cold-atom experiments.Comment: 8.5 pages, 11 figure
Hubbard physics in the symmetric half-filled periodic Anderson-Hubbard model
Two very different methods -- exact diagonalization on finite chains and a
variational method -- are used to study the possibility of a metal-insulator
transition in the symmetric half-filled periodic Anderson-Hubbard model. With
this aim we calculate the density of doubly occupied sites as a function of
various parameters. In the absence of on-site Coulomb interaction ()
between electrons, the two methods yield similar results. The double
occupancy of levels remains always finite just as in the one-dimensional
Hubbard model. Exact diagonalization on finite chains gives the same result for
finite , while the Gutzwiller method leads to a Brinkman-Rice transition
at a critical value (), which depends on and .Comment: 10 pages, 5 figure
Dynamical topological quantum phase transitions in nonintegrable models
We consider sudden quenches across quantum phase transitions in the XXZ
model starting from the Haldane phase. We demonstrate that dynamical phase
transitions may occur during these quenches that are identified by
nonanalyticities in the rate function for the return probability. In addition,
we show that the temporal behavior of the string order parameter is intimately
related to the subsequent dynamical phase transitions. We furthermore find that
the dynamical quantum phase transitions can be accompanied by enhanced two-site
entanglement.Comment: 5+1 pages, 4+1 figure
Periodic Anderson model with correlated conduction electrons: Variational and exact diagonalization study
We investigate an extended version of the periodic Anderson model (the so-called periodic Anderson-Hubbard model) with the aim to understand the role of interaction between conduction electrons in the formation of the heavy-fermion and mixed-valence states. Two methods are used: (i) variational calculation with the Gutzwiller wave function optimizing numerically the ground-state energy and (ii) exact diagonalization of the Hamiltonian for short chains. The f-level occupancy and the renormalization factor of the quasiparticles are calculated as a function of the energy of the f orbital for a wide range of the interaction parameters. The results obtained by the two methods are in reasonably good agreement for the periodic Anderson model. The agreement is maintained even when the interaction between band electrons, U d, is taken into account, except for the half-filled case. This discrepancy can be explained by the difference between the physics of the one- and higher-dimensional models. We find that this interaction shifts and widens the energy range of the bare f level, where heavy-fermion behavior can be observed. For large-enough U d this range may lie even above the bare conduction band. The Gutzwiller method indicates a robust transition from Kondo insulator to Mott insulator in the half-filled model, while U d enhances the quasiparticle mass when the filling is close to half filling. © 2012 American Physical Society
Periodic anderson model with d-f interaction
We investigate an extended version of the periodic Anderson model where an interaction is switched on between the doubly occupied d- and f-sites. We perform variational calculations using the Gutzwiller trial wave function. We calculate the f-level occupancy as a function of the f-level energy with different interaction strengths. It is shown that the region of valence transition is sharpened due to the new interaction
Momentum Distribution Functions in a One-Dimensional Extended Periodic Anderson Model
We study the momentum distribution of the electrons in an extended periodic Anderson model, where the interaction, , between itinerant and localized electrons is taken into account. In the symmetric half-filled model, due to the increase of the interorbital interaction, the electrons become more and more delocalized, while the itinerancy of conduction electrons decreases. Above a certain value of the electrons become again localized together with the conduction electrons. In the less than half-filled case, we observe that causes strong correlations between the electrons in the mixed valence regime
Altered element homeostasis and transmethylation ability in short-term polyphenol rich supplementation in hyperlipidemic animal model
Abstract Non-alcoholic fatty liver disease is one of the most common chronic liver diseases with unclarified pathomechanism and without evidence-proven therapy. Dietary polyphenols, targeting oxidative stress, are at the center of investigations. Our aim was to examine the effects of a polyphenol rich extract on metal element homeostasis and transmethylation ability in non-alcoholic fatty liver model. A ten-day rat model was used (control group, hyperlipidemic group with fat-rich diet, hyperlipidemic group with fat-rich diet and polyphenol supplementation, N = 8 in each group). The hyperlipidemic diet increased the concentration of the majority of the elements with significantly higher contents of B, Co, Cu, Fe, Mg, Mn, Na, Ni, P, Se, Si, and Zn in the liver. Further elevation of Al, Pb, and Sn concentrations could be observed in polyphenol supplemented animals. The polyphenol supplement unexpectedly decreased the transmethylation ability of the liver (132.00 vs. 114.15 vs. 92.25 HCHO μg g−1) further. The results emphasize the possible role of altered metal and non-metal element concentrations and decreased transmethylation ability in the pathomechanism of fatty liver disease. Dietary supplementation with natural compounds may have undesirable effect as well, there is the necessity to improve the efficacy of polyphenol formulations because of their low oral bioavailability
Momentum Distribution Functions in a One-Dimensional Extended Periodic Anderson Model
We study the momentum distribution of the electrons in an extended periodic Anderson model, where the interaction, Ucf, between itinerant and localized electrons is taken into account. In the symmetric half-filled model, due to the increase of the interorbital interaction, the f electrons become more and more delocalized, while the itinerancy of conduction electrons decreases. Above a certain value of Ucf the f electrons become again localized together with the conduction electrons. In the less than half-filled case, we observe that Ucf causes strong correlations between the f electrons in the mixed valence regime