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arXiv 1207.6337cond-mat.str-elcond-mat.mes-hall
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两腿梯形模型中的弱局域化和磁电阻

Weak localization and magnetoresistance in a two-leg ladder model

Michael P. Schneider, Sam T. Carr, Igor V. Gornyi, Alexander D. Mirlin

摘要:

在强退相条件下,分析了无自旋两腿梯形模型电导率的弱局域化修正,特别是考虑了磁场的存在,这导致了非常规的磁电阻行为.我们发现,磁场导致三种不同的效果:(i)负的磁阻由于定期弱本地化校正(ii)有效的解耦的两个链,导致正的磁阻和(iii)振荡的磁阻起源于低能集体激发的性质。所有这三种效应都可以根据参数范围观察到,但事实证明,大的磁场总是使链解耦,从而导致磁场增强局部化的奇怪效应。

英文摘要:

We analyze the weak localization correction to the conductivity of a spinless two-leg ladder model in the limit of strong dephasing τ_ϕ<< τ_tr, paying particular attention to the presence of a magnetic field, which leads to an unconventional magnetoresistance behavior. We find that the magnetic field leads to three different effects: (i) negative magnetoresistance due to the regular weak localization correction (ii) effective decoupling of the two chains, leading to positive magnetoresistance and (iii) oscillations in the magnetoresistance originating from the nature of the low-energy collective excitations. All three effects can be observed depending on the parameter range, but it turns out that large magnetic fields always decouple the chains and thus lead to the curious effect of magnetic field enhanced localization.

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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