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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 investigated magnetic susceptibility, magnetization and ESR in order to clarify the correlation between the magnetism and the electronic structure of BEDT-TTF.
Abstract: (BEDT-TTF) 3 CuBr 4 is a two-dimensional organic conductor whose structure consists of alternate stacking of BEDT-TTF π conducting sheets and magnetic Cu 2+ sheets. We investigate magnetic susceptibility, magnetization and ESR in order to clarify the correlation between the magnetism and the electronic structure. Above a structural transition T c =59 K, the magnetic susceptibility indicates the presence of strong antiferromagnetic interaction between the π-electrons on BEDT-TTF and the localized d -electrons on Cu 2+ . The transition brings about the disappearance of the magnetic moments of BEDT-TTF molecules below T c , which indicates the change from a Mott insulator to a band insulator state. Below T c , the susceptibility is governed only by Cu 2+ spins, and shows an antiferromagnetic transition at T N =7.65 K, where the π-electrons play an important role in the exchange interactions.

20 citations

Patent
24 Jan 2001
TL;DR: In this article, a method and structure of forming an integrated circuit chip having a transistor includes forming a conductive oxide layer, forming a Mott transition oxide layer over the conductive layer and forming an insulative oxide layer on top of the transition layer.
Abstract: A method and structure of forming an integrated circuit chip having a transistor includes forming a conductive oxide layer, forming a Mott transition oxide layer over the conductive oxide layer and forming an insulative oxide layer over the Mott transition oxide layer.

20 citations

Journal ArticleDOI
TL;DR: It is demonstrated that THz lasing threshold in realistic structures cannot be achieved without a THz cavity, due to destruction of polaritons via excitonic Mott transition.
Abstract: The influence of the surrounding cavity on the efficiency of different types of polaritonic emitters of THz radiation has been analysed. It is demonstrated that THz lasing threshold in realistic structures cannot be achieved without a THz cavity, due to destruction of polaritons via excitonic Mott transition. Even modest values of cavity quality factor (not exceeding 50) provide significant quantum efficiency.

20 citations

Journal ArticleDOI
TL;DR: In this article, the authors considered variants of the Jaynes-Cummings-Hubbard model of lattice polaritons, taking into account next-nearest-neighbor, diagonal, and long-range photon hopping in one and two dimensions.
Abstract: We consider variants of the Jaynes-Cummings-Hubbard model of lattice polaritons, taking into account next-nearest-neighbor, diagonal, and long-range photon hopping in one and two dimensions. These models are relevant for potential experimental realizations of polariton Mott insulators based on trapped ions or microwave stripline resonators. We obtain the Mott-superfluid phase boundary and calculate excitation spectra in the Mott phase using numerical and analytical methods. Including the additional hopping terms leads to a larger Mott phase in the case of trapped ions, and to a smaller Mott phase in the case of stripline resonators, compared to the original model with nearest-neighbor hopping only. The critical hopping for the transition changes by up to about 50 percent in one dimension and by up to about 20 percent in two dimensions. In contrast, the excitation spectra remain largely unaffected.

20 citations

Journal ArticleDOI
TL;DR: In this paper, the authors review the recent theoretical progress on the metal-to-insulator transition in multiorbital models for the iron-based superconductors and propose an overall phase diagram for the alkaline iron selenides.
Abstract: The bad metal behavior in the normal state of the iron-based superconductors suggests an intimate connection between the superconductivity and a proximity to a Mott transition. At the same time, there is strong evidence for the multi-orbital nature of the electronic excitations. It is then important to understand the orbital-dependent effects of electron correlations. In this paper we review the recent theoretical progresses on the metal-to-insulator transition in multiorbital models for the iron-based superconductors. These include studies of models that contain at least the 3d xy and 3d xz/yz models, using a slave-spin technique. For commensurate filling corresponding to that of the parent iron pnictides and chalcogenideds, a Mott transition generally exists in all these models. Near the Mott transition, a strongly correlated metal exhibiting bad metal features and strong orbital selectivity is stabilized due to the interplay of Hund's coupling and orbital-degeneracy breaking. Particularly for the alkaline iron selenides, the ordered vacancies effectively reduce the kinetic energy, thereby pushing the system further into the Mott-insulating regime; in the metallic state, there exists an orbital-selective Mott phase in which the iron 3d xy orbital is Mott localized while the other 3d orbitals are still itinerant. An overall phase diagram for the alkaline iron selenides has been proposed, in which the orbital-selective Mott phase connects between the superconducting phase and the Mott-insulating parent state.

20 citations


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