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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 paper, the authors performed high-resolution hard-x-ray photoemission spectroscopy for the metal-insulator transition (MIT) system and concluded that the on-site Coulomb energy does not change through the MIT, which eliminates all but one theoretical MIT scenario in this paradigm material.
Abstract: We have performed high-resolution hard-x-ray photoemission spectroscopy for the metal-insulator transition (MIT) system (V${}_{1\ensuremath{-}x}$Cr${}_{x}$)${}_{2}$O${}_{3}$ in the paramagnetic metal, paramagnetic insulator, and antiferromagnetic insulator phases. The quality of the spectra enables us to conclude that the on-site Coulomb energy $U$ does not change through the MIT, which eliminates all but one theoretical MIT scenario in this paradigm material.
19 citations
TL;DR: In this paper, a wave function of a Mott insulator based on the improved Gutzwiller function was presented, and a transition from a metal to a charge transfer insulator was shown to occur when the level difference between d and p orbitals reaches a critical value.
Abstract: In this study, we investigate the metal-insulator transition of charge transfer type in high-temperature cuprates. We first show that we must introduce a new band parameter in the three-band model to reproduce the Fermi surface of high-temperature cuprates such as BSCCO, YBCO and Hg1201. We present a new wave function of a Mott insulator based on the improved Gutzwiller function, and show that there is a transition from a metal to a charge-transfer insulator for such parameters by using the variational Monte Carlo method. This transition occurs when the level difference between d and p orbitals reaches a critical value . The energy gain , measured from the limit of large , is proportional to for (\Delta_{dp})_c$ SRC=http://ej.iop.org/images/0295-5075/107/2/27004/epl16387ieqn7.gif/>: . We obtain using the realistic band parameters.
19 citations
TL;DR: In this article, the spin and charge phase diagram of a three-legs ladder at zero temperature is studied as a function of fermion density and of transverse single-particle hopping.
Abstract: We study the spin and charge phase diagram of a three-legs ladder (at zero temperature) as a function of fermion density and of transverse single-particle hopping by means of a Renormalization-Group analysis rigorously controlled in the weak-coupling limit. Periodic boundary conditions in the direction transverse to the ladder produce frustrated magnetic excitations yielding a spin-gapped phase in a large region about and at half filling. Spin correlations are instead enhanced when open transverse boundary conditions are considered, yielding an ungapped phase in a wide region about half filling (as observed in the Sr$_{n-1}$Cu$_{n+1}$O$_{2n}$ stripes compounds) and at half filling down to a critical value of the transverse hopping $t_{\perp}$. At that critical value, the system undergoes a Mott transition at half filling by decreasing $t_{\perp}$.
19 citations
TL;DR: In this paper, the Mott transition from the low density state comprising of spatially indirect excitons to a high density electron-plasma state was demonstrated. But the transition was not observed in the case of a very high magnetic field.
Abstract: Photoluminescence spectra measured on a type-II $\mathrm{Ga}\mathrm{Sb}∕\mathrm{Ga}\mathrm{As}$ quantum dot ensemble at high excitation power indicate a Mott transition from the low density state comprising of spatially indirect excitons to a high density electron-plasma state. Under the influence of a very high magnetic field, the electron-plasma that is formed at high excitation powers is transformed into magneto-excitons.
19 citations
01 Jan 2001
19 citations