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arXiv 0710.4440cond-mat.str-elcond-mat.other
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对称性在可积量子晶格系统中T=0量子相变与非常规T>0输运性质相互作用中的作用

Role of symmetry in the interplay of T=0 quantum-phase transitions with unconventional T>0 transport properties in integrable quantum lattice systems

Jose. M. P. Carmelo, Shi-Jian. Gu, Nuno. M. R. Peres

摘要:

我们证明了一维哈伯德模型在无限小通量$ϕ$中的广义电荷SU(2)对称性从金属态产生半填充态,从而在有限温度下产生有限电荷刚度$D(T)$,并研究了其对$T$的依赖性.我们的结果是一般性质的许多可积量子晶格系统,揭示其奇异的$T>0$输运性质背后的微观机制和T=0的量子相变的相互作用,并有助于进一步了解超冷费米子原子在一维光晶格,准一维化合物,和一维纳米结构的相互作用系统中的电荷输运。

英文摘要:

We show that a generalized charge SU(2) symmetry of the one-dimensional (1D) Hubbard model in an infinitesimal flux $ϕ$ generates half-filling states from metallic states which lead to a finite charge stiffness $D(T)$ at finite temperature $T$, whose $T$ dependence we study. Our results are of general nature for many integrable quantum lattice systems, reveal the microscopic mechanisms behind their exotic $T>0$ transport properties and the interplay with T=0 quantum-phase transitions, and contribute to the further understanding of the transport of charge in systems of interacting ultracold fermionic atoms in 1D optical lattices, quasi-1D compounds, and 1D nanostructures.

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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