arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.12155hep-thcond-mat.mes-hallquant-ph
收藏

锥形环中费米子凝聚的Casimir效应

Casimir effect for fermion condensate in conical rings

A. A. Saharian, T. A. Petrosyan, A. A. Hovhannisyan

摘要:

本文研究了(2+1)维有质量费米子场的费米子凝聚(FC)。不同的边界条件的组合被施加在圆锥的边缘上。它们包括袋边界条件作为一种特殊情况。利用径向量子数本征值级数的广义Abel-Plana型求和公式,明确地提取了FC中的边诱导贡献。FC是磁通量的偶周期函数,其周期等于通量量子。取决于边界条件,凝聚可以是正的或负的。对于无质量场,无边界圆锥几何中的FC消失,非零贡献纯粹是边缘诱导效应。这提供了在没有磁场的情况下时间反演对称性破缺的机制。结合Clifford代数的两个不等价的不可约表示所对应的场的结果,研究了宇称和时间反演对称费米子模型中的FC,并讨论了其在石墨锥中的应用.

英文摘要:

The fermion condensate (FC) is investigated for a (2+1)-dimensional massive fermionic field confined on a truncated cone with an arbitrary planar angle deficit and threaded by a magnetic flux. Different combinations of the boundary conditions are imposed on the edges of the cone. They include the bag boundary condition as a special case. By using the generalized Abel-Plana-type summation formula for the series over the eigenvalues of the radial quantum number, the edge-induced contributions in the FC are explicitly extracted. The FC is an even periodic function of the magnetic flux with the period equal to the flux quantum. Depending on the boundary conditions, the condensate can be either positive or negative. For a massless field the FC in the boundary-free conical geometry vanishes and the nonzero contributions are purely edge-induced effects. This provides a mechanism for time-reversal symmetry breaking in the absence of magnetic fields. Combining the results for the fields corresponding to two inequivalent irreducible representations of the Clifford algebra, the FC is investigated in the parity and time-reversal symmetric fermionic models and applications are discussed for graphitic cones.

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。

↑