Topic
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 the metallic phase and near half filling, superconducting states are part of the degenerate ground state and are favored for small $U$ if the system is slightly perturbed.
Abstract: We obtain the exact solution of a general Hubbard chain with kinetic energy $t$, bond-charge interaction $X$, and on-site repulsion $U$ with the only restriction $t=X$. At zero temperature and half filling, the model exhibits a Mott transition at $U=4t$. In the metallic phase and near half filling, superconducting states are part of the degenerate ground state and are favored for small $U$ if the system is slightly perturbed.
100 citations
TL;DR: In this article, the density at which the dissociation of excitons begins and its temperature variation agree well with Mott's predictions, and the effects of electron-hole-liquid and Mott transition.
Abstract: Measurements of luminescence spectra in pure Si demonstrate the dissociation of excitons with increasing excitation intensity. The density at which the dissociation begins and its temperature variation agree well with Mott's predictions. We have also determined a phase diagram of Si, including the effects of electron-hole-liquid and Mott transition.
100 citations
TL;DR: In this article, the Mott transition was investigated using a cluster extension of dynamical mean field theory (DMFT), and no evidence for a finite temperature Mott critical point was found.
Abstract: We investigate the Mott transition using a cluster extension of dynamical mean field theory (DMFT). In the absence of frustration we find no evidence for a finite temperature Mott transition. Instead, in a frustrated model, we observe signatures of a finite temperature Mott critical point in agreement with experimental studies of $\ensuremath{\kappa}$ organics and with single-site DMFT. As the Mott transition is approached, a clear momentum dependence of the electron lifetime develops on the Fermi surface with the formation of cold regions along the diagonal direction of the Brillouin zone. Furthermore, the variation of the effective mass is no longer equal to the inverse of the quasiparticle residue, as in DMFT, and is reduced approaching the Mott transition.
98 citations
TL;DR: This study shows within the slave-boson technique that the Anderson lattice model exhibits a Kondo breakdown quantum critical point where the hybridization goes to zero at zero temperature, and shows the first evidence for a selective Mott transition in theAnderson lattice.
Abstract: We show within the slave-boson technique that the Anderson lattice model exhibits a Kondo breakdown quantum critical point where the hybridization goes to zero at zero temperature. At this fixed point, the $f$ electrons experience as well a selective Mott transition separating a local-moment phase from a Kondo-screened phase. The presence of a multiscale quantum critical point in the Anderson lattice in the absence of magnetism is discussed in the context of heavy fermion compounds. This study is the first evidence for a selective Mott transition in the Anderson lattice.
98 citations
TL;DR: In this article, the electronic reconstruction in (LaNiO{}{3}$)${}_{n}$/(LaAlO${}_1}$)/(LaNO{1, 2, 3, 4, 5, and 10) superlattices due to dc transport and resonant soft x-ray absorption spectroscopy was investigated.
Abstract: We investigate the electronic reconstruction in (LaNiO${}_{3}$)${}_{n}$/(LaAlO${}_{3}$)${}_{3}$ ($n=3$, 5, and 10) superlattices due to the quantum confinement (QC) by dc transport and resonant soft x-ray absorption spectroscopy. In proximity to the QC limit, a Mott-type transition from an itinerant electron behavior to a localized state is observed. The system exhibits tendency toward charge-order during the transition. $\mathit{Ab}$ $\mathrm{initio}$ cluster calculations are in good agreement with the absorption spectra, indicating that the apical ligand hole density is highly suppressed, resulting in a strong modification of the electronic structure. At the dimensional crossover cellular dynamical-mean-field calculations support the emergence of a Mott insulator ground state in the heterostructured ultrathin slab of LaNiO${}_{3}$.
98 citations