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arXiv 1012.0046cond-mat.str-el
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冷原子量子霍尔跃迁中$\mathbb{Z}_{2}$规范场的分数化

Fractionalization via $\mathbb{Z}_{2}$ Gauge Fields at a Cold Atom Quantum Hall Transition

Yafis Barlas, Kun Yang

摘要:

我们研究了在总填充因子为$ν_{f}=1$的“有效”磁场中,通过p波费什巴赫共振相互作用的单个费米子原子,并证明了系统经历了从$ν_{f} =1 $费米子整数量子霍尔态到$ν_{b} =1/4 $玻色子分数量子霍尔态的量子相变.转换在$(2+1)$ -D Ising普适类中。我们制定了一个对偶理论的准粒子与$\mathbb{Z}_{2}$规范场相互作用,并表明,电荷分馏如下从这个拓扑量子相变。我们的理论预测的实验结果和可能的测试进行了讨论。

英文摘要:

We study a single species of fermionic atoms in an "effective" magnetic field at total filling factor $ν_{f}=1$, interacting through a p-wave Feshbach resonance, and show that the system undergoes a quantum phase transition from a $ν_{f} =1 $ fermionic integer quantum Hall state to $ν_{b} =1/4 $ bosonic fractional quantum Hall state as a function of detuning. The transition is in the $(2+1)$-D Ising universality class. We formulate a dual theory in terms of quasiparticles interacting with a $\mathbb{Z}_{2}$ gauge field, and show that charge fractionalization follows from this topological quantum phase transition. Experimental consequences and possible tests of our theoretical predictions are discussed.

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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