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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 investigated the possible disappearance of Mott oscillations in the scattering of bosonic nuclei at sub-barrier energies and found that the inclusion of the short-range nuclear interaction has a profound influence on this phenomenon.
Abstract: We investigate the possible disappearance of Mott oscillations in the scattering of bosonic nuclei at sub-barrier energies. This effect is universal and happens at a critical value of the Sommerfeld parameter. It is also found that the inclusion of the short-range nuclear interaction has a profound influence on this phenomenon. Thus we suggest that the study of this lack of Mott oscillation, which we call, "transverse isotropy" is a potentially useful mean to study the nuclear interaction.
Dissertation•
06 Mar 2015
TL;DR: In this article, a phase diagram showing the transitions to the superfluid and Mott insulating states of magnons in an easy-plane ferromagnetic insulator with an external magnetic field applied is presented.
Abstract: In this thesis we will construct a phase diagram showing the transitions to the superfluid and Mott insulating states of magnons in an easy-plane ferromagnetic insulator with an external magnetic field applied First we transform the Hamiltonian describing this system in several ways, to explore the basic behaviour and to obtain a boundary for the superfluid phase of these magnons We then use a mean-field approach with the Bose-Hubbard Hamiltonian, done by van Oosten et al, “Quantum Phases in an Optical Lattice”, Physical Review A 63, 053601 (2001), to find the Mott insulating regions Finally, we scrutinize the validity of using this Hamiltonian for our system, by showing some of the different results it yields as compared to the original spin-Hamiltonian We conclude that the obtained phase diagram is inaccurate for low spins (S = 2 or lower) but significantly more reliable for high spins (S = 6 and higher)
01 Jan 2002
TL;DR: In this paper, the metal-insulator transition is viewed as a classic Mott transition, in which spin and orbital degrees of freedom are independent, and the structural transition in the temperature range 150-160K is strongly first-order and ferroelastic.
Abstract: Vanadium sesquioxide (V2O3) displays a number of electronic, magnetic and structural properties that are challenging to interpret and explain1–7. At room temperature V2O3 has the corundum structure with space group \(R\bar 3c\) , and it is metallic and paramagnetic. On reducing the temperature the corundum structure distorts to a monoclinic structure with space group I2/a. The structural transition in the temperature range 150 – 160K is strongly first-order and ferroelastic. Accompanying the transition are a change from metallic to insulating behaviour and the onset of antiferromagnetic order3. The metal-insulator transition is viewed as a classic Mott transition, in which spin and orbital degrees of freedom are independent.
TL;DR: In this article , the authors present the first nonperturbative numerical investigation of the disorder-induced insulator-metal transition in a two-dimensional frustrated Mott insulator.
Abstract: Frustrated Mott insulators such as transition metal dichalcogenides present an ideal platform for the experimental realization of externally tuned insulator-metal transition. In this paper, we present the first nonperturbative numerical investigation of the disorder-induced insulator-metal transition in a two-dimensional frustrated Mott insulator. Our approach is generic and captures the essential physics of Mott insulator-metal transition in geometrically frustrated lattices. For concreteness, we have compared our results with the experimental observations on copper (Cu) intercalated 1T-TaS2. Based on the magnetic, spectroscopic, and transport signatures, we have mapped out the thermal phase diagram of Cu intercalated 1T-TaS2 and established that over a regime of moderate disorder strength this material hosts an antiferromagnetic metal. Moreover, the insulator-metal transition in this system is not tied to the loss of magnetic correlations, thereby giving rise to two quantum critical points. The emergent non-Fermi liquid metal is governed by resilient quasiparticles, that survive as the relevant low energy excitations even after the break down of the Fermi liquid description. The transport and spectroscopic signatures discussed in this paper are expected to serve as important benchmarks for future experiments on this and related class of materials.
10 Jan 2023
TL;DR: In this article , the Mott transition between a nonmagnetic Mott insulating (NMI) state and a Fermi liquid (FL) was systematically studied by calorimetric measurements.
Abstract: The organic system, $\kappa$-[(BEDT-TTF)$_{1-x}$(BEDT-STF)$_x$]$_2$Cu$_2$(CN)$_3$, showing the Mott transition between a nonmagnetic Mott insulating (NMI) state and a Fermi liquid (FL), is systematically studied by calorimetric measurements. An increase of the electronic heat capacity at the transition from the NMI state to the FL state which keeps the triangular dimer lattice demonstrates that the charge sector lost in the Mott insulating state is recovered in the FL state. We observed that the remaining low-energy spin excitations in the Mott insulating state show unique temperature dependence, and that the NMI state has a larger lattice entropy originating from the frustrated lattice, which leads to the Pomeranchuk-like effect on the electron localization. Near the Mott boundary, an unexpected enhancement and magnetic-field dependence of heat capacity are observed. This anomalous heat capacity is different from the behavior in the typical first-order Mott transition and shows similarities with quantum critical behavior. To reconcile our results with previously reported scenarios about a spin gap and the first-order Mott transition, further studies are desired.