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arXiv 1302.3896cond-mat.str-el
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朗道能级混合与分数量子霍尔效应

Landau Level Mixing and the Fractional Quantum Hall Effect

Inti Sodemann, A. H. MacDonald

摘要:

我们推导了分数量子霍尔效应在n=0和n=1朗道能级的有效哈密顿量,这些哈密顿量微扰地解释了电子-电子相互作用引起的朗道能级混合。对于电子-电子相互作用与回旋能量之比的二阶,朗道能级混合是通过构建有效相互作用哈密顿量来解释的,该哈密顿量包括以Haldron赝势为特征的两体和三体贡献。我们的研究建立在以前的治疗,作为垫脚石的观察,有效的哈密顿量是完全由少体问题与N=2和N=3的电子在部分填充朗道水平。对于n=0的情况下,我们使用的第一个量子化的方法,以提供一个紧凑和透明的推导的有效哈密顿捕获一类虚拟的过程中省略的早期推导的朗道能级混合校正Haldom赝势。

英文摘要:

We derive effective Hamiltonians for the fractional quantum Hall effect in n=0 and n=1 Landau levels that account perturbatively for Landau level mixing by electron-electron interactions. To second order in the ratio of electron-electron interaction to cyclotron energy, Landau level mixing is accounted for by constructing effective interaction Hamiltonians that include two-body and three-body contributions characterized by Haldane pseudopotentials. Our study builds upon previous treatments, using as a stepping stone the observation that the effective Hamiltonian is fully determined by the few-body problem with N=2 and N=3 electrons in the partially filled Landau level. For the n=0 case we use a first quantization approach to provide a compact and transparent derivation of the effective Hamiltonian which captures a class of virtual processes omitted in earlier derivations of Landau-level-mixing corrected Haldane pseudopotentials.

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