Paired states at 5/2: Particle-hole Pfaffian and particle-hole symmetry breaking

Paired states at 5/2: Particle-hole Pfaffian and particle-hole symmetry breaking
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5/2 处的配对态:粒子孔普法夫和粒子孔对称性破缺

DOI:
10.1103/physrevb.98.115107
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
M. Milovanović
M. Milovanović
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
L. Antonic;J. Vučičević;M. Milovanović

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研究了Dirac复合费米子(CF)系统中的库珀配对.狄拉克CF描述中质量项的存在(可以模拟朗道能级混合),即,在这个系统中,粒子-空穴(PH)对称性的破缺是PH类Pfronan拓扑态存在的必要条件。在随机相位近似(RPA)和流体动力学方法的范围内,我们发现一些签名的配对在有限的频率。出于这一认识,我们扩展我们的分析的情况下,不同的,但仍然狄拉克准粒子(CF)表示,适当的质量项的存在下,并讨论的可能性PH Pfiran和Pfiran配对一般。在规范场效应的基础上,我们发现对于小质量的狄拉克,反普夫朗或普夫朗不稳定性取决于质量的符号,而对于大质量(朗道能级混合),无论其符号如何,我们发现PH普夫朗不稳定性。
We study Cooper pairing in the Dirac composite fermion (CF) system. The presence of the mass term in the Dirac CF description (which may simulate Landau level mixing), i.e., breaking of particle-hole (PH) symmetry in this system, is a necessary condition for the existence of a PH Pfaffian-like topological state. In the scope of the random-phase approximation (RPA) and hydrodynamic approach, we find some signatures of pairing at finite frequencies. Motivated by this insight, we extend our analysis to the case of a different but still Dirac quasiparticle (CF) representation, appropriate in the presence of a mass term, and discuss the likelihood of PH Pfaffian and Pfaffian pairings in general. On the basis of gauge field effects, we find for a small Dirac mass, an anti-Pfaffian or Pfaffian instability depending on the sign of mass, while for large mass (Landau level mixing), irrespective of its sign, we find a PH Pfaffian-like instability.
DOI: 10.1103/physrevb.98.035127
发表时间: 2018-03
期刊: Physical Review B
影响因子: 3.7
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Ajit C. Balram;M. Barkeshli;M. Rudner
通讯作者: Ajit C. Balram;M. Barkeshli;M. Rudner
DOI: 10.1103/physrevb.98.081107
发表时间: 2018-04
期刊: Physical Review B
影响因子: 3.7
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