Topic
Mott transition
About: Mott transition is a research topic. Over the lifetime, 2444 publications have been published within this topic receiving 78401 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, strong Coulomb correlations in dense two-dimensional electron-hole plasmas were studied by means of direct path integral Monte Carlo simulations, and the formation and dissociation of bound states, such as excitons, bi-excitons and many particle clusters, was analyzed and the density-temperature regions of their occurrence were identified.
2 citations
TL;DR: In this paper, the behavior of excitonic correlation in the proximity of the Mott transition density is elucidated through the resonant excitation of 1s excitons with using a nonlinear terahertz spectroscopy technique.
Abstract: We performed optical pump-THz probe spectroscopy on bulk GaAs to investigate the nature of exciton Mott transition. The behavior of excitonic correlation in the proximity of the Mott transition density is elucidated through the resonant excitation of 1s excitons with using a nonlinear terahertz spectroscopy technique. We discuss the anomalous charge carrier dynamics of the metallic phase on the verge of Mott transition that appears only at low temperatures.
2 citations
TL;DR: In this article, the authors consider the Mott transition in the context of a two-dimensional fermion model with density-density coupling and present a Hilbert space mapping between the original model and the Double Lattice Chern-Simons theory at the critical point by use of the representation theory of the q-oscillator and Weyl algebras.
Abstract: We reconsider the Mott transition in the context of a two-dimensional fermion model with density-density coupling. We exhibit a Hilbert space mapping between the original model and the Double Lattice Chern-Simons theory at the critical point by use of the representation theory of the q-oscillator and Weyl algebras. The transition is further characterized by the ground state modification. The explicit mapping provides a new tool to further probe and test the detailed physical properties of the fermionic lattice model considered here and to enhance our understanding of the Mott transition(s).
2 citations
Journal Article•
TL;DR: In this article, a real-space picture of itinerant electrons functioning in the fluctuating geometries bounded by interfaces between metallic and insulating regions was proposed, where the interfaces are closed bosonic strings coupled to itinerant electron.
Abstract: Our current understanding of strongly correlated electron systems is based on a homogeneous framework. Here we take a step going beyond this paradigm by incorporating inhomogeneity from the beginning. Specifying to systems near the Mott metal-insulator transition, we propose a real-space picture of itinerant electrons functioning in the fluctuating geometries bounded by interfaces between metallic and insulating regions. In 2+1 dimensions, the interfaces are closed bosonic strings, and we have a system of strings coupled to itinerant electrons. When the interface tension vanishes, the geometric fluctuations become critical, which gives rise to non-Fermi-liquid behavior for the itinerant electrons. In particular, the poles of the fermion Green's function can be converted to zeros, indicating the absence of propagating quasiparticles. Furthermore, the quantum geometric fluctuations mediate Cooper pairing among the itinerant electrons, indicating the intrinsic instability of electronic systems near the Mott transition.
2 citations
TL;DR: In this paper, the half-filled-band Hubbard model on an anisotropic triangular lattice (t in two bond directions and t′ in the other), using an optimization VMC method, is considered.
Abstract: To consider the paring symmetry formed in organic compounds κ-(BEDT-TTF)2X, we study the half-filled-band Hubbard model on an anisotropic triangular lattice (t in two bond directions and t′ in the other), using an optimization VMC method. As trial states, we adopt a coexisting state of an antiferromagnetic (AF) order and the d x 2 - y 2 -wave RVB gap, in addition to the d + id- and d + d-wave gap states. In these states, we take account of the effect of band (or Fermi surface) renormalization. Magnetic Mott transitions occur, and a regime of robust superconductivity could not be found, in contrast with our previous study. In the insulating regime, the coexisting state in which an AF order prevails is always the lowest-energy state up to remarkably large t′/t (≲1.3), whereas a dxy-wave RVB state becomes predominant when t′/t exceeds this value. In the insulating regime, the effective Fermi surface, determined by the renormalized value t ˜ ′ / t , is markedly renormalized into different directions according to t′/t; for t′/t ≲ 1.3, it approaches that of the square lattice ( t ˜ ′ / t = 0 ) , whereas for t′/t ≳ 1.3, it becomes almost one-dimensional ( t ˜ ′ / t ≫ 1 ) .
2 citations