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arXiv 1406.2379cond-mat.mes-hall
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是什么决定了复合费米子的费米波矢?

What Determines the Fermi Wave Vector of Composite Fermions?

D. Kamburov, Yang Liu, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin

摘要:

复合费米子(CFs)是由偶数个通量量子与每个电子配对而形成的奇异粒子,它对高磁场下二维电子相互作用所表现出的现象提供了一个迷人的描述。在朗道能级填充$ν=1/2$处和附近,CF占据费米海,并在受到周期性电势调制时表现出可重复性效应。我们观察到一个明显的不对称性的磁场位置的可磁化性电阻最小值的CF相对于在$ν=1/2$的字段。这种意想不到的不对称性与CF的费米波矢量在数量上是一致的,该费米波矢量由最低朗道能级中的\textit{minority}载流子决定。我们的数据表明,在$ν=1/2$附近的CF的粒子-空穴对称性的破坏。

英文摘要:

Composite fermions (CFs), exotic particles formed by pairing an even number of flux quanta to each electron, provide a fascinating description of phenomena exhibited by interacting two-dimensional electrons at high magnetic fields. At and near Landau level filling $ν=1/2$, CFs occupy a Fermi sea and exhibit commensurability effects when subjected to a periodic potential modulation. We observe a pronounced asymmetry in the magnetic field positions of the commensurability resistance minima of CFs with respect to the field at $ν=1/2$. This unexpected asymmetry is quantitatively consistent with the CFs' Fermi wave vector being determined by the \textit{minority} carriers in the lowest Landau level. Our data indicate a breaking of the particle-hole symmetry for CFs near $ν=1/2$.

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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