Density matrix renormalization group algorithm for Bethe lattices of spin-1/2 or spin-1 sites with Heisenberg antiferromagnetic exchange
Data(s) |
06/04/2012
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Resumo |
A density matrix renormalization group (DMRG) algorithm is presented for the Bethe lattice with connectivity Z = 3 and antiferromagnetic exchange between nearest-neighbor spins s = 1/2 or 1 sites in successive generations g. The algorithm is accurate for s = 1 sites. The ground states are magnetic with spin S(g) = 2(g)s, staggered magnetization that persists for large g > 20, and short-range spin correlation functions that decrease exponentially. A finite energy gap to S > S(g) leads to a magnetization plateau in the extended lattice. Closely similar DMRG results for s = 1/2 and 1 are interpreted in terms of an analytical three-site model. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/44379/1/Dimethyl.pdf Kumar, Manoranjan and Ramasesha, S and Soos, Zoltan G (2012) Density matrix renormalization group algorithm for Bethe lattices of spin-1/2 or spin-1 sites with Heisenberg antiferromagnetic exchange. In: Physical Review B, 85 (13). |
Publicador |
American Physical Society |
Relação |
http://prb.aps.org/abstract/PRB/v85/i13/e134415 http://eprints.iisc.ernet.in/44379/ |
Palavras-Chave | #Solid State & Structural Chemistry Unit |
Tipo |
Journal Article PeerReviewed |