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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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Journal ArticleDOI
TL;DR: In this paper, the authors present two optical techniques for the investigation of the transport properties of ambipolar plasmas in semiconductors, one based on surface doping with shallow impurities which provide a characteristic bound exciton emission and the other based on the Mott transition between the electronhole plasma and free excitons in Si.

10 citations

Journal ArticleDOI
Abstract: Electronic/magnetic transitions and their struc- tural consequences in Fe-based Mott insulators in a re- gime of very high static density are the main issue of this short review paper. The paper focuses on the above-men- tioned topics based primarily on our previous and on- going experimental HP studies employing: (i) diamond anvil cells, (ii) synchrotron X-ray diffraction, (iii) 57 Fe Mossbauer spectroscopy, (iv) electrical resistance and (v) X-ray absorption spectroscopy. It is shown that applying pressure to such strongly correlated systems leads to a number of changes; including quenching of the orbital moment, quenching of Jahn-Teller distortion, spin cross- over, inter-valence charge transfer, insulator-metal tran- sition, moment collapse and volume collapse. These changes may occur simultaneously or sequentially over a range of pressures. Any of these may be accompanied by or be a consequence of a structural phase transition; namely, a change in crystal symmetry. Analyzing this rich variety of phenomena we show the main scenarios which such strongly correlated systems may undergo on the way to a correlation breakdown (Mott transition). To illustrate these scenarios we present recent results for MFeO3 (M ¼ Fe, Ga, Lu, Eu, Pr) and CaFe2O4 ferric oxi- des; FeCl2 and FeI2 ferrous halides, and FeCr2S4 sulfide. Fe3O4 is given as an example case for the impact of Mossbauer Spectroscopy on High Pressure Crystallogra- phy studies.

10 citations

Journal ArticleDOI
TL;DR: In this article, the physics of doping a Mott insulator in the presence of a solid-vacuum interface is investigated using the embedding approach for dynamical mean field theory.
Abstract: The physics of doping a Mott insulator is investigated in the presence of a solid-vacuum interface. Using the embedding approach for dynamical mean field theory we show that the change in surface spectral evolution in a doped Mott insulator is driven by a combination of charge transfer effects and enhanced correlation effects. Approaching a Mott insulating phase from the metallic side, we show that a dead layer forms at the surface of the solid, where quasiparticle amplitudes are exponentially suppressed. Surface correlation and charge transfer effects can be strongly impacted by changes of the hopping integrals at the surface.

10 citations

Journal ArticleDOI
TL;DR: In this article, a single yttrium hydride thin film is conveniently driven through the T = 0 metal-insulator transition by fine-tuning the charge :carrier density n via persistent photoconductivity at low temperature.
Abstract: A single yttrium hydride thin film is conveniently driven through the T = 0 metal-insulator transition by fine-tuning the charge :carrier density n via persistent photoconductivity at low temperature. Simultaneously, electrical conductivity and Hall measurements are performed for temperatures T down to 350 mK and magnetic fields up to 14 T. A scaling analysis is applied and critical exponents, resolved separately on the metallic and insulating sides of the critical region, are determined consistently. We introduce corrections to scaling to invoke collapse of the data onto a single master curve over an extended region of the (n, T) phase diagram.

10 citations

Dissertation
19 Nov 2019
TL;DR: In this paper, a Bose-Einstein condensate of metastable Helium atoms is transferred to a 3D cubic lattice potential (optical lattice) by using He$^*$ atoms to detect the atoms individually and in 3D after a long time of flight.
Abstract: In this work, we transfer a Bose-Einstein condensate of metastable Helium atoms to a 3D cubic lattice potential (optical lattice) This system is an experimental realization of the Bose-Hubbard Hamiltonian that depends on two parameters that are the interaction strength U between the atoms and the kinetic energy J Depending on the value of the ratio U/J, the ground state of the system is either a superfluid (SF) or a Mott insulator (MI) In the experiment, we investigated the Mott transition that separates the SF and the MI phases Thanks to the use of He$^*$ atoms, one can detect the atoms individually and in 3D after a long time-of-flight As a result, we access the in-trap momentum distribution of the lattice gases probed with a single atom sensitivity and one can compute the momentum correlations at any order We demonstrate that the 2 and 3-particles correlations of a Mott insulator deep in the MI phase are the ones of a system described by a gaussian density operator In the MI phase, we investigate the restoration of the first-order coherence on approaching the Mott transition Finally, by comparing the momentum distributions measured in the experiment with Quantum Monte Carlo numerical simulations performed with the experimental parameters and calculated for a wide range of temperatures, we calculated the temperature of the lattice gases probed, allowing us to investigate the transition between a SF and a thermal gas (NF) that occurs when increasing the temperature of the system We notably have measured the condensate fraction across the SF-NF and the SF-MI transitions We demonstrated that when probing trapped systems, if the condensate fraction is a good observable to locate the position of the phase transition, it is not the case for the SF-MI transition We thus probed different observables

10 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202334
202271
202165
202064
201968
201871