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Dynamic structure factor in impurity-doped spin chains
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DOI：10.1103/PhysRevB.98.020402.png)
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摘要
En 中文
The effects of impurities in spin-1/2 Heisenberg chains have recently experienced a renewed interest due to experimental realizations in solid state systems and ultracold gases. Nonmagnetic impurities lead to effectively isolated finite chain segments with a discrete spectrum and characteristic correlations, which have a distinct effect on the dynamic structure factor. Using bosonization and the numerical density matrix renormalization group, we provide detailed quantitative predictions for the momentum- and energy-resolved structure factor in doped systems. Due to the impurities, spectral weight is shifted away from the antiferromagnetic wave vector k = pi into regions which normally have no spectral weight in the thermodynamic limit. The effect can be quantitatively described in terms of scaling functions, which are derived from a recurrence relation based on bosonization.
Keyword:
HEISENBERG ANTIFERROMAGNETIC CHAINS
SPECTRAL PROPERTIES
LUTTINGER LIQUID
CONSEQUENCES
TEMPERATURE
EXPONENTS
BEHAVIOR
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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