Impurity corrections to the thermodynamics in spin chains using a transfer-matrix DMRG method

TL;DR

This paper introduces a transfer-matrix DMRG method to accurately compute impurity effects on thermodynamics in spin chains, confirming theoretical predictions and providing new insights into crossover behaviors.

Contribution

It presents a novel numerical approach using transfer-matrix DMRG to analyze impurity corrections in spin chains, validating field theory results and exploring crossover phenomena.

Findings

Numerical results confirm field theory predictions.

New insights into impurity-induced crossover behavior.

Method applicable to various impurity models in spin chains.

Abstract

We use the density matrix renormalization group (DMRG) for transfer matrices to numerically calculate impurity corrections to thermodynamic properties. The method is applied to two impurity models in the spin-1/2 chain, namely a weak link in the chain and an external impurity spin. The numerical analysis confirms the field theory calculations and gives new results for the crossover behavior.