Quantum phase transitions to topological Haldane phases in spin-one chains studied by linked-cluster expansions

被引:2
作者
Adelhardt, P. [1 ]
Gritsch, J. [1 ]
Hille, M. [2 ]
Reiss, D. A. [1 ]
Schmidt, K. P. [1 ]
机构
[1] FAU Erlangen Nurnberg, Inst Theoret Phys, Erlangen, Germany
[2] TU Dortmund, Lehrstuhl Theoret Phys 1, Dortmund, Germany
关键词
ANTIFERROMAGNETIC HEISENBERG-CHAINS; BOND ALTERNATION; COMPUTATION; DIAGRAM; ANYONS; ETA;
D O I
10.1103/PhysRevB.96.235123
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We use linked-cluster expansions to analyze the quantum phase transitions between symmetry-unbroken trivial and topological Haldane phases in two different spin-one chains. The first model is the spin-one Heisenberg chain in the presence of a single-ion anisotropy, while the second one is the dimerized spin-one Heisenberg chain. For both models, we determine the ground-state energy and the one-particle gap inside the nontopological phase as a high-order series using perturbative continuous unitary transformations. Extrapolations of the gap series are applied to locate the quantum critical point and to extract the associated critical exponent. We find that this approach works unsatisfactorily for the anisotropic chain, since the quality of the extrapolation appears insufficient due to the large correlation length exponent. In contrast, extrapolation schemes display very good convergence for the gap closing in the case of the dimerized spin-one Heisenberg chain.
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页数:6
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