Strongly renormalized quasi-two-dimensional electron gas in a heterostructure with correlation effects

Abstract

We present aspects of strong electron correlation in a model of a BI/M/BI heterostructure where BI is a band insulator and M can be tuned from a metal to a Mott insulator by varying the on-site repulsion. An effective one-dimensional Schroedinger equation for the low-energy part is derived in the framework of the Kotliar-Ruckenstein slave-boson mean-field theory and solved self-consistently for a wide range of the on-site interaction strength and of the width of the sandwiched material M. In the strongly interacting limit coherent quasiparticles responsible for metallic behavior are confined to a relatively narrow region near the interfaces where they form a quasi-two-dimensional electron gas. Due to the lack of spatial homogeneity these quasiparticles intrinsically obtain a nontrivial dependence on the transverse momentum which for example enters the low-energy behavior of the optical conductivity.

References in corpus (4)

• Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
• Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices
• Lattice polarization effects on electron-gas charge densities in ionic superlattices
• Modulation Doping near Mott-Insulator Heterojunctions

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• Supersolid state of ultracold fermions in an optical lattice
• Embedding approach for dynamical mean field theory of strongly correlated heterostructures
• Supersolid state in fermionic optical lattice systems
• Aspects of metallic low-temperature transport in Mott-insulator/ band-insulator superlattices: optical conductivity and thermoelectricity
• Stripe Formation in Fermionic Atoms on 2-D Optical Lattice inside a Box Trap: DMRG Studies for Repulsive Hubbard Model with Open Boundary Condition
• Exact results in a slave boson saddle point approach for a strongly correlated electron model
• Slave-boson based configuration-interaction approach for the Hubbard model
• Role of multiple subband renormalization in the electronic transport of correlated oxide superlattices