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arXiv 2001.00724hep-thcond-mat.mtrl-sci
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低维超对称涡旋模型中的电荷流和自旋流

Charge and Spin Currents in a Lower-Dimensional Supersymmetric Model in Presence of Vortices

Cristine N. Ferreira, J. P. S. Alves e Silva, J. A. Helayel Neto, N. Panza

摘要:

我们调查的电荷和自旋电流,可能会出现在某些材料,考虑可能的耦合和对称性的场论模型在这里。我们采用N =2 - D=3的超对称框架,在(1+2)维中考察了这些可能的电流,并加入了Chern-Simons项和非最小耦合。我们讨论了一些方面的连接与涡的配置是拓扑可行的。我们研究的新特征考虑了涡旋存在时U(1)对称和超对称(SUSY)破缺的性质。我们专注于费米子部门的各个方面及其与电流的相互作用。结合费米子的能谱,我们还根据模型的参数导出了质量隙。我们强调的另一点是超对称性在我们考虑中的作用。一旦石墨烯和拓扑绝缘体材料被描述为一个Dirac-like方程,我们假设,作为一个工作假设,超对称性也可能对这些材料的性能有一定的影响。沿着这条线,必须将超对称性分解与这类材料联系起来。我们相信,我们的讨论可以为理解这类低维系统带来一些元素。

英文摘要:

We investigate charge and spin currents that may appear in some materials, considering the possible couplings and the symmetries of a field-theoretical model presented here. We inspect these possible currents in (1+2) dimensions by adopting an N =2 - D=3 supersymmetric framework with a Chern-Simons term and non-minimal couplings as well. We discuss a number of aspects in connection with a vortex configuration that is topologically viable. The new features of our investigation take into account the nature of both the U(1)-symmetry and supersymmetry (SUSY) breakings in presence of the vortex. We focus on aspects of the fermionic sector and their interactions with the currents. In connection with the spectrum of fermions, we also derive the mass gap in terms of the parameters of the the model. Another point we highlight is the role SUSY in our considerations. Once graphene and topological insulator materials are described by a Dirac-like equation, we assume, as a working hypothesis, that SUSY may also have some influence on the properties of these materials. Along this line, it is mandatory to connect the SUSY breakdown to this class of materials. We believe that our discussion could bring some elements for the understanding of this category of lower-dimensional systems.

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