Schmidt S, Alhassid Y
Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2008 Nov 14;101(20):207003. doi: 10.1103/PhysRevLett.101.207003. Epub 2008 Nov 13.
We investigate the competition between superconductivity and ferromagnetism in chaotic ultrasmall metallic grains in a regime where both phases can coexist. We use an effective Hamiltonian that combines a BCS-like pairing term and a ferromagnetic Stoner-like spin exchange term. We study the transport properties of the grain in the Coulomb-blockade regime and identify signatures of the coexistence of pairing and exchange correlations in the mesoscopic fluctuations of the conductance peak spacings and peak heights.
我们研究了在一个两种相可以共存的区域中，混沌超小金属颗粒中超导性和铁磁性之间的竞争。我们使用了一个有效哈密顿量，它结合了一个类BCS配对项和一个类铁磁斯托纳自旋交换项。我们研究了库仑阻塞区域中颗粒的输运性质，并在电导峰间距和峰高的介观涨落中识别出配对和交换关联共存的特征。
