Superconductivity in Strongly Correlated Electronic Systems
نویسندگان
چکیده
A microscopic theory of superconducting pairing within the Hubbard model is discussed. A Dyson equation for the matrix thermodynamic Green function in the Nambu representation for Hubbard operators is derived by applying the Mori-type projection technique for the equation of motion method. The self-energy is calculated in the noncrossing approximation for electron scattering on spin and charge fluctuations induced by kinematic interaction for Hubbard operators. It is shown that superconducting pairing in strongly correlated electronic systems is determined by antiferromagnetic exchange caused by interband hopping and spin fluctuations due to hole motion in one subband.
منابع مشابه
Recent Advances in High-Temperature Superconductivity
After more than 15 years of intense research since the discovery of high-temperature superconductivity [1], many interesting physical phenomena unique to the cuprate superconductors are better understood, and various applications have been realized. However, the underlying mechanism for high-temperature superconductivity remains elusive, largely due to the complication of numerous competing ord...
متن کاملElectronic transport in Si and Au monoatomic chains considering strongly correlation effect, a first principle study
We have investigated structure and electronic properties of Au and Si liner chains using the firstprinciplesplane wave pseudopotential method. The transport properties and conductance of these twoliner chains are studied using Landauer approaches based on density functional theory (DFT). Weobtain density of states and band gap using Kohn-Sham and Wannier functions as well as quantumconductivity...
متن کاملExact Solution of an electronic model of superconductivity in 1 + 1 dimensions I *
We study a superconducting integrable model of strongly correlated electrons in 1 + 1 dimensions. We construct all six Bethe Ansätze for the model and give explicit expressions for lowest conservation laws. We also prove a lowest weight theorem for the Bethe-Ansatz states.
متن کاملIntroduction to Unconventional Superconductivity
This lecture gives a basic introduction into some aspects of the unconventional superconductivity. First we analyze the conditions to realize unconventional superconductivity in strongly correlated electron systems. Then an introduction of the generalized BCS theory is given and several key properties of unconventional pairing states are discussed. The phenomenological treatment based on the Gi...
متن کاملElectronic model for superconductivity 1 Fabian
We consider a model of strongly correlated electrons that exhibits superconduc-tivity. It diiers from the Hubbard model by nearest neighbour interactions. We nd the ground state wave function (in one, two or three dimensions) and show it to be superconducting for attractive and moderately repulsive on-site interaction. 1 The phenomenon of high-T c superconductivity has led to an increased inter...
متن کامل