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arXiv 0709.2386cond-mat.other
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重费米子极限下的一维玻色-费米-哈伯德模型

The one-dimensional Bose-Fermi-Hubbard model in the heavy-fermion limit

A. Mering, M. Fleischhauer

摘要:

本文研究了零温一维玻色-费米-哈伯德模型在费米子小跃迁极限下的相图。该模型可以看作是随机变量具有二分值的无序玻色-哈伯德模型的一个实例。可压缩,不可压缩(莫特绝缘)和部分可压缩的相位之间的边界推导出解析内的一个广义的强耦合扩展和数值使用密度矩阵重整化群(DMRG)方法。我们发现,在部分可压缩阶段的一阶相关性指数衰减,表明玻璃型行为。波动在各自的不可压缩阶段内确定使用摄动理论和DMRG的结果进行比较。

英文摘要:

We study the phase diagram of the zero-temperature, one-dimensional Bose-Fermi-Hubbard model for fixed fermion density in the limit of small fermionic hopping. This model can be regarded as an instance of a disordered Bose-Hubbard model with dichotomic values of the stochastic variables. Phase boundaries between compressible, incompressible (Mott-insulating) and partially compressible phases are derived analytically within a generalized strong-coupling expansion and numerically using density matrix renormalization group (DMRG) methods. We show that first-order correlations in the partially compressible phases decay exponentially, indicating a glass-type behaviour. Fluctuations within the respective incompressible phases are determined using perturbation theory and are compared to DMRG results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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