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arXiv 1503.08972cond-mat.str-el
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三分量哈伯德模型中质量不平衡引起的金属-绝缘体相变

Mass-imbalance induced metal-insulator transition in a three-component Hubbard model

Duong-Bo Nguyen, Duy-Khuong Phung, Van-Nham Phan, Minh-Tien Tran

摘要:

利用动力学平均场论结合精确对角化方法研究了三分量哈伯德模型中的质量不平衡效应。该模型描述了两种不同粒子种类的费米子-费米子混合物,具有质量不平衡。一种是双组分费米子粒子,另一种是单组分费米子粒子。粒子种类之间的局部相互作用被认为是各向同性的。发现质量不平衡可以驱动混合物从绝缘体到金属。绝缘体-金属转变是较轻质量粒子的类物种选择性转变,并且仅发生在相称的粒子密度和适度的局部相互作用下。对于弱和强的局部相互作用,质量不平衡不改变混合物的基态。

英文摘要:

The effects of mass imbalance in a three-component Hubbard model are studied by the dynamical mean-field theory combined with exact diagonalization. The model describes a fermion-fermion mixture of two different particle species with a mass imbalance. One species is two-component fermion particles, and the other is single-component ones. The local interaction between particle species is considered isotropically. It is found that the mass imbalance can drive the mixture from insulator to metal. The insulator-metal transition is a species-selective-like transition of lighter mass particles and occurs only at commensurate particle densities and moderate local interactions. For weak and strong local interactions the mass imbalance does not change the ground state of the mixture.

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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