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arXiv 1701.00543cond-mat.dis-nn
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具有准随机无序的耦合全同定域费米子链

Coupled identical localized fermionic chains with quasi-random disorder

Vieri Mastropietro

摘要:

利用非微扰重整化群方法研究了具有准随机无序的全同相互作用无自旋费米子链的基态局域化性质。在单链或双链的情况下,局部化持续存在,而对于大量的链,通常预期不同的定性行为,除非多体相互作用消失。这是由于频率的数论性质,类似于KAM理论中假设的那些,以及由于泡利原理的抵消,泡利原理在单链或双链的情况下意味着所有的有效相互作用都是不相关的;相反,对于大量的链,存在相关的有效相互作用。

英文摘要:

We analyze the ground state localization properties of an array of identical interacting spinless fermionic chains with quasi-random disorder, using non-perturbative Renormalization Group methods. In the single or two chains case localization persists while for a larger number of chains a different qualitative behavior is generically expected, unless the many body interaction is vanishing. This is due to number theoretical properties of the frequency, similar to the ones assumed in KAM theory, and cancellations due to Pauli principle which in the single or two chains case imply that all the effective interactions are irrelevant; in contrast for a larger number of chains relevant effective interactions are present.

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