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arXiv 1010.4908cond-mat.str-el
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作为I型量子Hall液体的弱耦合Pfronan

The Weakly Coupled Pfaffian as a Type I Quantum Hall Liquid

S. A. Parameswaran, S. A. Kivelson, S. L. Sondhi, B. Z. Spivak

摘要:

在半满朗道能级附近的电子的Pfronan相被认为是复合费米子的p+ip超导体。我们考虑这个配对的量子霍尔相位时的配对规模是小的,即在弱耦合,BCS,限制,其中的相干长度远大于电荷屏蔽长度的属性。我们发现,在I型超导体中,涡旋吸引,使得当磁场从其在ν=5/2的魔值变化时,系统表现出库仑阻挫相分离。我们提出,弱耦合和强耦合的Pfronan态是I型和II型量子霍尔流体之间的一般二分法。

英文摘要:

The Pfaffian phase of electrons in the proximity of a half-filled Landau level is understood to be a p+ip superconductor of composite fermions. We consider the properties of this paired quantum Hall phase when the pairing scale is small, i.e. in the weak-coupling, BCS, limit, where the coherence length is much larger than the charge screening length. We find that, as in a Type I superconductor, the vortices attract so that, upon varying the magnetic field from its magic value at ν=5/2, the system exhibits Coulomb frustrated phase separation. We propose that the weakly and strongly coupled Pfaffian states exemplify a general dichotomy between Type I and Type II quantum Hall fluids.

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