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First-order transition between a small-gap semiconductor and a ferromagnetic metal in the isoelectronic alloys FeSiGe
V. I. Anisimov, R. Hlubina, M. A. Korotin +4
The contrasting groundstates of isoelectronic and isostructural FeSi and FeGe can be explained within an extended local density approximation scheme (LDA+U) by an appropriate choic…
A Bosonic Model of Hole Pairs
Th. Siller, M. Troyer, T. M. Rice +1
We numerically investigate a bosonic representation for hole pairs on a two-leg t-J ladder where hard core bosons on a chain represent the hole pairs on the ladder. The interaction…
Thermodynamics of the t-J Ladder: A Stable Finite Temperature Density Matrix Renormalization Group Calculation
Beat Ammon, Matthias Troyer, T. M. Rice +1
Accurate numerical simulations of a doped t-J model on a two-leg ladder are presented for the particle number, chemical potential, magnetic susceptibility and entropy in the limit…
Singlet and triplet doped-hole configurations in La_2Cu_0.5Li_0.5O_4
V. I. Anisimov, S. Yu. Ezhov, T. M. Rice
The ordered alloy La_2Li_{0.5}Cu_{0.5}O_4 is found to be a band insulator in local density approximation (LDA) calculations with the unoccupied conduction band having predominantly…
Low-Energy Properties of Antiferromagnetic Spin-1/2 Heisenberg Ladders with an Odd Number of Legs
Beat Frischmuth, Stephan Haas, German Sierra +1
An effective low-energy description for multi-leg spin-1/2 Heisenberg ladders with an odd number of legs is proposed. Using a newly developed Monte Carlo loop algorithm and exact d…
Electronic and Magnetic Structure of LaCuO
B. Normand, T. M. Rice
The recently-discovered ``ladder'' compound LaCuO has been found to admit hole doping without altering its structure of coupled copper oxide ladders. While susceptibility m…
Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
E. Dagotto, T. M. Rice
One way of making the transition between the quasi-long range order in a chain of S=1/2 spins coupled antiferromagnetically and the true long range order that occurs in a plane, is…
Resistivity as a function of temperature for models with hot spots on the Fermi surface.
R. Hlubina, T. M. Rice
We calculate the resistivity as a function of temperature for two models currently discussed in connection with high temperature superconductivity: nearly antiferromagnetic…
Exciton condensate in semiconductor quantum well structures.
Xuejun Zhu, P. B. Littlewood, M. S. Hybertsen +1
We propose that the exciton condensate may form in a well-controlled way in appropriately arranged semiconductor quantum well structures. The mean-field theory of Keldysh and Kopae…
Strong Coupling Expansions for Antiferromagnetic Heisenberg S=1/2 Ladders
M. Reigrotzki, H. Tsunetsugu, T. M. Rice
The properties of antiferromagnetic Heisenberg ladders with 2, 3, and 4 chains are expanded in the ratio of the intra- and interchain coupling constants. A simple m…
Cross relaxation and the bilayer coupling in YBCO
H. Monien, T. M. Rice
There is strong experimental evidence for substantial antiferromagnetic coupling between the CuO planes of the bilayers in YBCO compounds. The acoustic mode of the spin excitat…
Superconductivity in the Two-Dimensional - Model at Low Hole Doping
Elmar S. Heeb, T. Maurice Rice
By combining a generalized Lanczos scheme with the variational Monte Carlo method we can optimize the short- and long-range properties of the groundstate separately. This allows us…
Spin Gap Fixed Points in the Double Chain Problem
D. V. Khveshchenko, T. M. Rice
Applying the bosonization procedure to weakly coupled Hubbard chains we discuss the fixed points of the renormalization group flow where all spin excitations are gapful and a singl…