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arXiv 1210.0909cond-mat.str-elcond-mat.mes-hall
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二维玻色子对称性保护拓扑相之间的量子相变:突现$QED_3$和任意子超流

Quantum phase transitions between bosonic symmetry protected topological phases in two dimensions: emergent $QED_3$ and anyon superfluid

Yuan-Ming Lu, Dung-Hai Lee

摘要:

受二维对称性保护拓扑相的Chern-Simons有效理论描述的启发,我们给出了二维对称性保护拓扑相的多体波函数的一种射影构造。利用这种投影构造,我们可以系统地写出一个格子上的SPT相的试探波函数。对于正方形格子上每格点填充$ν_{b_1}=ν_{b_2}=\frac12$的两类玻色子,构造了具有$U(1)$对称性的SPT相位的显式例子。我们研究了基于投影构造的不同$U(1)$ -SPT相位之间的连续相变。临界点附近的有效理论是具有费米子数$N_f=2$的突现$QED_3$。然而,这种连续相变需要微调,并且通常在不同的$U(1)$ -SPT相之间存在中间相。我们发现这样的中间相具有与任意子超导体相同的响应,因此称之为“任意子超流体”。给出了具有$U(1)$对称性的相互作用玻色子的相图。

英文摘要:

Inspired by Chern-Simons effective theory description of symmetry protected topological (SPT) phases in two dimensions, we present a projective construction for many-body wavefunctions of SPT phases. Using this projective construction we can systematically write down trial wavefunctions of SPT phases on a lattice. An explicit example of SPT phase with $U(1)$ symmetry is constructed for two types of bosons with filling $ν_{b_1}=ν_{b_2}=\frac12$ per site on square lattice. We study continuous phase transitions between different $U(1)$-SPT phases based on projective construction. The effective theory around the critical point is emergent $QED_3$ with fermion number $N_f=2$. Such a continuous phase transition however needs fine tuning, and in general there are intermediate phases between different $U(1)$-SPT phases. We show that such an intermediate phase has the same response as an anyon superconductor, and hence dub it "anyon superfluid". A schematic phase diagram of interacting bosons with $U(1)$ symmetry is depicted.

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