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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: The van der Waals equation of state for a conduction-electron gas at concentrations near the Mott metal-to-insulator transition was examined in this paper, where it was shown that the MOTT concentration is universal for conductionelectron condensation.
Abstract: The van der Waals equation of state for a conduction-electron gas at concentrations near the Mott metal-to-insulator transition is examined. The Mott concentration is found to be universal for conduction-electron gas condensation.
1 citations
TL;DR: The Ca3Ru2O7 with a Mott-like transition at 48 K and a Neel temperature at 56 K features different in-plane anisotropies of magnetization and magnetoresistance as mentioned in this paper.
Abstract: The Ca3Ru2O7 with a Mott-like transition at 48 K and a Neel temperature at 56 K features different in-plane anisotropies of magnetization and magnetoresistance. Applying the magnetic field along the magnetic easy axis precipitates a spin-polarized state via a first-order metamagnetic transition but does not lead to full suppression of the Mott state, whereas applying a magnetic field along the magnetic hard axis does, causing a resistivity reduction of three orders of magnitude. The colossal magnetoresistivity is attributed to the collapse of a novel, orbitally ordered and spin-polarized state. This new phenomenon is striking in that the spin polarization, which is a fundamental driving force for all other magnetoresistive systems, is detrimental to the colossal magnetoresistance (CMR) in this 4d-based electron system. Evidence for a density wave is also presented.
1 citations
TL;DR: In this paper, the authors describe the Mott-Hubbard transition from a perturbation theory arising from a two-dimensional Hubbard model and calculate the self-energy within the random phase approximation and a double-Lorentzian as a non-interacting density of states.
Abstract: We are interested in the description of the Mott-Hubbard transition from a perturbation theory arising from a two-dimensional Hubbard model. We calculate the self-energy within the random phase approximation and a double-Lorentzian as a non-interacting density of states. The paramagnetic ground state is unstable for realistic values of U, since the self-energy presents some inconsistencies ; one of them is that its imaginary part presents more than one zero, which is a violation of the Luttinger theorem. We use a Bogolyubov transformation and within a spin density wave mean field, the antiferromagnetic correlations of wave vector Q = (π/a,π/a) are included. We recalculate the self-energy in the new ground state and then it is able to describe the Mott-Hubbard transition, and the Luttinger theorem is satisfied.
1 citations
TL;DR: In this paper, the phase diagram of electron-hole plasma in single and coupled quantum wells is presented, showing that if the separation between electron well and hole well is large enough, the decrease of temperature leads to a transition to a ferromagnetic exciton phase with a spontaneous spin polarization.
Abstract: We present the phase diagram of electron-hole plasma in single and coupled quantum wells. In the last case, electrons and holes are spatially separated. In both single and coupled quantum wells there is a Mott transition from electron-hole plasma to exciton gas. Below the Mott transition in a single quantum well there is a crossover to the biexciton gas phase which rules out the Kosterlitz-Thouless transition of excitons. In coupled quantum wells a strong direct repulsion between excitons prevents the biexciton formation. If the separation between electron well and hole well is large enough, the decrease of temperature leads to a transition to a ferromagnetic exciton phase with a spontaneous spin polarization. Further decrease of temperature leads to the Kosterlitz-Thouless transition of the exciton gas.
1 citations
TL;DR: In this article, the 1s-2p transition energy of excitons in Si was directly probed by the broadband terahertz pulses, and it was shown that the resonance structure sustains even above the Mott density, although broadened.
Abstract: We have investigated the exciton Mott transition in a bulk Si by optical pump and terahertz probe spectroscopy under quasi-thermal equilibrium condition. The 1s-2p transition energy of excitons in Si that locates around 12 meV (∼3 THz) is directly probed by the broadband terahertz pulses. The resonance energy of the 1s-2p transition stays unchanged with increasing the photo-excited electron-hole (e-h) pair density. The resonance structure sustains even above the Mott density, although broadened, in contrast to the conventional picture of the exciton Mott transition where the exciton binding energy vanishes toward the Mott density. The results indicate the existence of excitonic correlation in the metallic electron-hole plasma phase (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
1 citations