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Many-Body Effects on the ρ_(xx) Ringlike Structures in Two-Subband Wells

机译:两子带井中ρ_(xx)环状结构的多体效应

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摘要

The longitudinal resistivity ρ_(xx) of two-dimensional electron gases formed in wells with two subbands displays ringlike structures when plotted in a density-magnetic-field diagram, due to the crossings of spin-split Landau levels (LLs) from distinct subbands. Using spin density functional theory and linear response, we investigate the shape and spin polarization of these structures as a function of temperature and magnetic-field tilt angle. We find that (i) some of the rings "break" at sufficiently low temperatures due to a quantum Hall ferromagnetic phase transition, thus exhibiting a high degree of spin polarization (~50%) within, consistent with the NMR data of Zhang et al. [Phys. Rev. Lett. 98, 246802 (2007)], and (ii) for increasing tilting angles the interplay between the anticrossings due to inter-LL couplings and the exchange-correlation effects leads to a collapse of the rings at some critical angle θ_c, in agreement with the data of Guo et al. [Phys. Rev. B 78, 233305 (2008)].
机译:当在密度磁场图中绘制时,由于自旋分裂的朗道能级(LLs)与不同的子带相交,因此在具有两个子带的井中形成的二维电子气的纵向电阻率ρ_(xx)显示出环状结构。使用自旋密度泛函理论和线性响应,我们研究了这些结构的形状和自旋极化与温度和磁场倾斜角的关系。我们发现(i)某些环由于量子霍尔铁磁相变而在足够低的温度下“断裂”,从而在其中表现出高度的自旋极化(〜50%),这与Zhang等人的NMR数据一致。 [物理牧师98,246802(2007)]和(ii)为了增加倾斜角度,由于LL间的耦合和交换相关效应引起的抗交叉作用之间的相互作用导致环在某个临界角θ_c处塌陷,与郭等人的数据。 [物理修订版B 78,233305(2008)。

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