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PAIRING CORRELATIONS ABOVE Tc AND PSEUDOGAPS IN UNDERDOPED CUPRATES

Mohit Randeria, Nandini Trivedi

Journal of Physics and Chemistry of SolidsOct 1, 199817 citations

Theory of Spin Excitations in Undoped and Underdoped Cuprates

Don H. Kim, Patrick A. Lee

arXiv:cond-mat/9810130Annals of PhysicsFeb 1, 1999164 citations

The Spin Gap and Superconducting States of Underdoped Cuprates

Patrick A. Lee

Springer series in solid-state sciencesJan 1, 19990 citations

A CLASS OF COLLECTIVE EXCITATIONS OF THE HUBBARD MODEL: η EXCITATION OF THE NEGATIVE-U MODEL

Eugene Demler, Shoucheng Zhang, NEJAT BULUT +1 more

In this series of papers we present a detailed study of the particle-particle collective excitations of the Hubbard model, and their contribution to the density and spin excitation spectrum. In the first paper, we shall investigate the singlet particle-particle pair with momentum (π, π), the η particle, of the negative-U Hubbard model. We review three previously obtained theorems about the η particle and develop a self-consistent linear response theory which takes into account its contribution to the density excitation spectrum in the superconducting state. We show that this self-consistent theory agrees with the exact theorems as well as the results of numerical Monte Carlo simulations.In this series of papers we present a detailed study of the particle-particle collective excitations of the Hubbard model, and their contribution to the density and spin excitation spectrum. In the first paper, we shall investigate the singlet particle-particle pair with momentum (π, π), the η particle, of the negative-U Hubbard model. We review three previously obtained theorems about the η particle and develop a self-consistent linear response theory which takes into account its contribution to the density excitation spectrum in the superconducting state. We show that this self-consistent theory agrees with the exact theorems as well as the results of numerical Monte Carlo simulations.

arXiv:cond-mat/9512009International Journal of Modern Physics BJul 30, 199614 citations

Spectral Properties of Underdoped Cuprates

A. Ramšak, Peter Prelovšek, Igor Sega

Springer eBooksJan 1, 20012 citations

NUMERICAL STUDY OF THE ELECTRONIC STATES IN HOLE- AND ELECTRON-DOPED HIGH-TC CUPRATES

Takami Tohyama

We examine the electronic states in the hole- and electron-doped cuprates by using the t-t′-t″-J model. Numerically exact diagonalization method is employed for a 20-site square lattice under twisted boundary conditions. The density of states in the underdoped region clearly shows a pseudogap behavior near the Fermi level in both hole and electron dopings. In hole doping, the edge of the pseudogap in the occupied side exhibits a large weight that comes from a flat band near k=(π,0). In contrast, the weight near the gap edge in electron doping is larger for the unoccupied side than for the occupied side.We examine the electronic states in the hole- and electron-doped cuprates by using the t-t′-t″-J model. Numerically exact diagonalization method is employed for a 20-site square lattice under twisted boundary conditions. The density of states in the underdoped region clearly shows a pseudogap behavior near the Fermi level in both hole and electron dopings. In hole doping, the edge of the pseudogap in the occupied side exhibits a large weight that comes from a flat band near k=(π,0). In contrast, the weight near the gap edge in electron doping is larger for the unoccupied side than for the occupied side.

International Journal of Modern Physics BJan 30, 20050 citations

SPIN SUSCEPTIBILITY AND THE Π-EXCITATION IN UNDERDOPED CUPRATES

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