Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Hong Kong, China.
Phys Rev Lett. 2012 Jun 22;108(25):257002. doi: 10.1103/PhysRevLett.108.257002. Epub 2012 Jun 18.
By using Bogoliubov-de Gennes equations, we study superconducting (SC) states in a quasi-two-dimensional system of radius R. It is shown that no vortices exist in s-wave SC samples with R < R(c) ~ ξ(0), the T = 0 coherence length. We predict that chiral p-wave states exhibit superconductivity for R < R(c) only in the presence of a vortex with opposite chirality. This induced SC phase is a consequence of nonzero chirality of the pairing order parameter and implies the presence of chiral edge currents. Our study may be applied to sharply probing the pairing symmetry of unconventional superconductors.
利用 Bogoliubov-de Gennes 方程，我们研究了半径为 R 的准二维系统中的超导 (SC) 态。结果表明，在 T = 0 相干长度为 ξ(0)的 s 波超导样品中不存在涡旋。我们预测，只有在存在具有相反手性的涡旋的情况下，手性 p 波态才会在 R < R(c) 下表现出超导性。这种诱导的 SC 相是配对有序参数的非零手性的结果，并意味着存在手性边缘电流。我们的研究可应用于对非常规超导体的配对对称性进行精确探测。
