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Mott transition
About: Mott transition is a research topic. Over the lifetime, 2444 publications have been published within this topic receiving 78401 citations.
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TL;DR: In this article, the authors studied the interplay of correlation and thermal fluctuation in a system consisting of two species of classical particles with up and down spin on a geometrically frustrated anisotropic triangular lattice, described by an extended four-state Potts model.
Abstract: We study the interplay of correlation and thermal fluctuation in a system consisting of two species of classical particles with up and down spin on a geometrically frustrated anisotropic triangular lattice, described by an extended four-state Potts model. The model corresponds to the strong coupling limit of the extended Hubbard model at quarter-filling, which is known to host several competing charge ordered phases as well as an exotic quantum state called pinball liquid. The frustrated intersite Coulomb interactions together with the on-site Coulomb interaction generate macroscopically degenerate manifolds of low-energy states. They compete entropically at finite temperature and two characteristic states emerge; a threefold periodic charge ordered state and a quasi-one-dimensionally disordered state called ``good defect state'' characterized by the systematic generation of ferroelectric bonds. The two states show good correspondence with the threefold charge order and the pinball liquid in the extended Hubbard model, and are separated by the partial Mott transition taking place on one of the three sublattices of the triangular lattice.
6 citations
TL;DR: In this article, the authors investigated the consequences of the qualitative change in the hadron spectrum on final state interactions of charmonium in hot and dense matter, and showed that the Mott effect for D-mesons leads to a critical enhancement of the J/Psi dissociation rate.
Abstract: At the chiral restoration/deconfinement transition, most hadrons undergo a Mott transition from being bound states in the confined phase to resonances in the deconfined phase. We investigate the consequences of this qualitative change in the hadron spectrum on final state interactions of charmonium in hot and dense matter, and show that the Mott effect for D-mesons leads to a critical enhancement of the J/Psi dissociation rate. Anomalous J/Psi suppression in the NA50 experiment is discussed as well as the role of the Mott effect for the heavy flavor kinetics in future experiments at the LHC. The status of our calculations of hadron-hadron cross sections using the quark interchange and chiral Lagrangian approaches is reviewed, and an Ansatz for a unification of these schemes is given.
6 citations
18 Mar 2015
TL;DR: In this article, a two-dimensional Hubbard model on a Penrose lattice by means of real-space dynamical mean-field theory was studied, and local electron correlations on the quasi-periodic structure were discussed.
Abstract: We study a two-dimensional Hubbard model on a Penrose lattice by means of the real-space dynamical mean-field theory. Calculating the renormalization factor and density of states at each site, we discuss local electron correlations on the quasi-periodic structure. It is found that the renormalized metallic state appears near the Mott transition in the Penrose lattice system. We also address a spatially-dependent renormalization characteristic of the quasi-periodic lattice.
6 citations
TL;DR: The less correlated system was found to be the pure CoO(2), however it is still strongly correlated and very close to the Mott transition, and U/t ∼ 15, which is the critical value for the MOTT transition in a triangular lattice is found.
Abstract: We used quantum chemical ab initio methods to determine the effective parameters of Hubbard and t–J models for the NaxCoO2 compounds (x = 0 and 0.5). As for the superconducting compound we found the a1g cobalt orbitals above the eg' ones by a few hundreds of meV due to the eg'–eg hybridization of the cobalt 3d orbitals. The correlation strength was found to increase with the sodium content x, whereas the in-plane AFM coupling decreases. The less correlated system was found to be the pure CoO2, however it is still strongly correlated and very close to the Mott transition. Indeed we found U/t ~ 15, which is the critical value for the Mott transition in a triangular lattice. Finally, we found the magnetic exchanges in the CoO2 layers to be strongly dependent on the weak local structural distortions.
6 citations
TL;DR: In this paper, the noise properties of beryllium delta-doped GaAs/AlAs multiple quantum wells, doped both above and below the Mott transition, were studied within the frequency range of 10 Hz−20 kHz and at temperature from 77 K to 350 ǫK.
Abstract: Noise properties of beryllium delta-doped GaAs/AlAs multiple quantum wells, doped both above and below the Mott transition, are studied within the frequency range of 10 Hz−20 kHz and at temperature from 77 K to 350 K. It is shown that the generation-recombination noise in structures close to the Mott transition exhibits two peaks—a frequency and temperature-dependent peak between 120 and 180 K and a broadband, frequency- and temperature- nearly independent peak around 270 K. Activation energies are estimated; origin of the broadband maximum is attributed to holes tunnelling into defect trap states located in the AlAs barrier/GaAs quantum well interface.
6 citations