Thermodynamics of the t-J Ladder: A Stable Finite Temperature Density Matrix Renormalization Group Calculation

Abstract

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 of large exchange coupling on the rung using a finite temperature density matrix renormalization group (TDMRG) method. This required an improved algorithm to achieve numerical stability down to low temperatures. The thermal dissociation of hole pairs and of the rung singlets are separately observed and the evolution of the hole pair binding energy and magnon spin gap with hole doping is determined.

4 pages, RevTex V3.0, includes 4 eps figures

References in corpus (5)

• Thermodynamics of quantum Heisenberg spin chains
• Thermodynamics of frustrated quantum spin chains
• Temperature-induced gap formation in dynamic correlation functions of the one-dimensional Kondo insulator --- Finite-temperature density-matrix renormalization-group study ---
• Impurity corrections to the thermodynamics in spin chains using a transfer-matrix DMRG method
• Thermodynamic properties of the one-dimensional Kondo insulators studied by the density matrix renormalization group method

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• Temperature driven crossover phenomena in the correlation lengths of the one-dimensional t-J model
• Application of the density matrix renormalization group method to finite temperatures and two-dimensional systems
• Essential finite-size effect in the 2D XY model
• Thermodynamics and Crossover Phenomena in the Correlation Lengths of the One-Dimensional t-J Model
• Accurate computation of low-temperature thermodynamics for quantum spin chains
• Study of Pairing Correlations in the Attractive Hubbard Model on Chains, Ladders, and Squares
• Doped two orbital chains with strong Hund's rule couplings - ferromagnetism, spin gap, singlet and triplet pairings
• Spin-1 chain doped with mobile S=1/2 fermions
• The two-leg t-J ladder: A mean-field description
• Efficiency of symmetric targeting for finite-T DMRG
• Effect of the Orbital Level Difference in Doped Spin-1 Chains
• Doping a Mott insulator with orbital degrees of freedom
• Spectroscopy and complex-time correlations using minimally entangled typical thermal states
• Doping dependence of the spin gap in a 2-leg ladder