Adaptive Density Matrix Renormalization Group for Disordered Systems

Abstract

We propose a simple modification of the density matrix renormalization group (DMRG) method in order to tackle strongly disordered quantum spin chains. Our proposal, akin to the idea of the adaptive time-dependent DMRG, enables us to reach larger system sizes in the strong disorder limit by avoiding most of the metastable configurations which hinder the performance of the standard DMRG method. We benchmark our adaptive method by revisiting the random antiferromagnetic XXZ spin-1/2 chain for which we compute the random-singlet ground-state average spin-spin correlation functions and von Neumann entanglement entropy. We then apply our method to the bilinear-biquadratic random antiferromagnetic spin-1 chain tuned to the antiferromagnet and gapless highly symmetric SU(3) point. We find the new result that the mean correlation function decays algebraically with the same universal exponent $\varphi =2$ as the spin-1/2 chain. We then perform numerical and analytical strong-disorder renormalization-group calculations which confirm this finding and generalize it for any highly symmetric SU($N$) random-singlet state.

arXiv comment9 pages,8 figures, final version to appear in PRB

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Cited by in corpus (8)

• The correlation functions of certain random antiferromagnetic spin-1/2 critical chains
• Highly-symmetric random one-dimensional spin models
• Adaptive Density-Matrix Renormalization-Group study of the disordered antiferromagnetic spin-1/2 Heisenberg chain
• Disorder in interacting quasi-one-dimensional systems: flat and dispersive bands
• Random singlet-like phase of disordered Hubbard chains
• Scaling of entanglement entropy at quantum critical points in random spin chains
• Classical restrictions of generic matrix product states are quasi-locally Gibbsian
• Signatures of infinite randomness in transport properties of disordered spin chains